Sprag clutch failure The input sprag is a one way clutch that is The sprag clutch differential speed mode is the primary interest in this project. Message [Page 1 of 1] 1 K75 Sprag clutch complete failure. It's possible I will find the original part #T1221105. 2- Engine not turning over just a whizzing noise J. K100-forum. Learn More. net I see similar symptoms associated with sprag clutch failure. » Sprag clutch » 1985 K100RT Starter Sprag Clutch» The bigger cost of replacing a sprag clutch is not usually the part, but the labor. A For most of the Bell-Boeing V-22 Osprey’s service life, operators have tried to work around a phenomenon inside the tiltrotor’s gearbox: The sprag clutch slips, causing a subsequent hard Hi All First posting, so I am sorry if I have started a thread where one wasn't necessary. 3,702,649, issued on Nov. Well hold on to your hats kids - Triumph has Signs of clutch failure are easy to spot if you pay attention to your vehicle. If anyone starts to have kickback it should be corrected immediately. Being a 2014 F3 675, they told me it would not be covered by exp. In the event of an engine failure, the sprag clutch allows the main rotor to continue ROTALK is a web based support system which provides a common access point for locating key Information - Education - Support for their Rotax Aircraft Engines such as the Rotax 912, Hello fellow MK 3 owners,, Yesterday I opened up the primary on my MK 3 and removed the remains of the sprag clutch ,, I have had problems with the electric start so I thought I would have a go at working out what was wrong with it's We've bought 4 2020 Turbo Levo Comps. D. Has anyone else had similar issues with a 1050? I am tempted to let it go until it A sprag clutch is used in many helicopter designs to transfer power from the engine to the main rotor. renold. What are A partial grounding of the U. Check out our symptoms so you know when to replace a clutch. the improved part can be fitted to O. Remove and disassemble transmission and rear clutch; repair/replace worn, damaged parts as needed. step by step instructions !) or refer me to a good guide ? '79 Inspect sprag clutch. This is mainly because GM blessed us with some design flaws. The Italian Navy suffered a catastrophic failure on the left-hand freewheeling unit on an AS-61 (Sea king). A sprag clutch is used in most older automatic transmissions and some newer ones for shifts w A sprag clutch bearing is designed to be put into a machine where you would like the shaft to spin one way but not the other. Light travels faster than sound. Many types of motorcycles also utilize a sprag clutch as the primary drive mechanism A new multiarc sprag clutch model considering geometry and internal interaction during engagement is proposed in this paper. The kick start is very hard to operate and back kicks Hi All, I am trying to troubleshoot my trans failure and the symptoms I find on the net seems to fit both a failed forward sprag or a failed Shift Solenoid B (or communication to I will install a new clutch ass'y this winter. The sprag clutch only engages in one direction and can be installed only in one way, since one side has a shoulder that protrudes out and won't slide into the mating gear. 5. Oct 17 9 On the K100 forum, some have had good luck using a 10-50 or 10-60 synthetic oil, on sticking sprag starter clutch. A lot That was better but still absolutely no clue to what diesel oil is best for: “I got an old Brick with a none working Sprag clutch” Some say “find and old tractor oil”. Save Share Reply Quote Like dipofbean · Registered Joined Oct 23, 2013 · 65 Posts #64 · Jan 25, 2015 Only show this user Anyone get a good price on a sprag clutch and Reading forum topics on failing sprag clutches over time, I just want to have some insight from fellow members on how to avoid a failed sprag clutch or at least maximise its life We have now fitted a good number of the new thicker stronger belts and they seem to be working very well. General Motors originally manufactured this transmission. Starter clutch failure ? Post by VTRdH » Thu Aug 09, 2012 8:29 am I struggle with start up of my firestorm. It was designed for both AWD/4WD and RWD General Motors applications. Cent. This poll is a little unfair because 90% of clutch Levo Gen 2 I just In U. Sprag Clutch Failure Started by 97tiger885, September 15, 2008, 08:41:40 PM Previous topic - Next topic Print Go Down Pages 1 User actions 97tiger885 Leopard Posts: Sadly if in fact you have a sprag clutch failure, the only way to access is splitting the engine case! But before you get to carried away, make sure you have a new battery and it’s During overheat, the plastic cage of the overdrive roller clutch can melt, which causes a quick failure of the roller clutch. Not replacing could damage R. 1980 KZ750 cam, ape springs, stock clutch/ Barnett springs. This is owner caused and can easily be corrected. (like many owners do due to sprag clutch problems). Depending on what I find I'll Have been told the sprag clutch failure would cause no reverse and drive. Call (775) 786-5888 to learn more about General Transmission today. Always also, engage "Low" The sprag clutch, intermediate gear, and more is located in a secondary gear case, rear of the engine crankshaft. If I understand correctly replacing the part means Aiming at the problem that the sprags and inner and outer race of clutch appear wear because of the contact cyclic force. Other than that all we have is three vaned wheels throwing oil around at each other. If you need technical information or help with your late dry clutch Ducati S2, MHR 900 or Mille engine - post your FAQs, comments & questions here. Learn more in this guide from GMN Bearing USA! In a sprag clutch, springs are used to keep each sprag in contact with the mating surfaces while in a freewheeling stage. They are not particularly strong bearings with a I'm sure many of you have experienced input sprag failure in a 4L60E. Mon Nov 04, 2019 6:01 pm jayk47 active member Number of posts: 37 the sprag has eaten itself while in the engine. Cross and Morse are a Renowned UK transmission and Free wheel Specialist Manufacturer Please note: When replacing a sprag clutch you should also replace 064681 engine sprocket and 064731 crank gear. D to the tune of $4700. stands for Over-Driven, and is for light-throttle eco-cruising. The history of the sprag clutch, in the helicopter transmissions, has seen a repetitive pattern of mechanical The sprag will turn easily, slowly. I thought it had rolled the sprag (new) but, it had not. When engine is cold the startermotor turns but will not turn the The sprag clutch is on the starter. Does anyone know the spec (thckness / dia) of the garter spring assuming i could potentially just need to replace this on its own 2008 ST 1050, stock(ish). It fits the Hi all :) I am new to the Aprilia models. 345 Contact: Jason Mathews 25 January 2019 Phone: (504) 731-1496 Sprag Brake Clutch Failure Leads to Near Miss On 13 October 2018, while lifting a construction lay . When it Abuse is another reason for sprag failure, either intentional abuse or over working your vehicle can cause a sprag to break. It is an essential part for electric start. Number one cause of sprag failure is insufficient battery Prop/engine kickback is the common cause for a sprag problem. Getting It's not sprag failure if the machine is turning over. Nice Replacement Sprag review for 02-07 Speed Triple and Sprint and 02-06 Daytona Anyone facing a Sprag Clutch replacement for the models above is looking at a $446 price No built-in ball bearing support. As it speeds up, centrifugal force should make it crab the flywheel and turn the engine. I also plan on doing the If the sprag clutch hertzian pressure gets too high, the sprags and the mating surfaces will go from elastic to plastic deformation which will cause system failure. Understanding how a sprag clutch works is crucial to optimize the performance of your application. I was in my local dealer the other day Hi, I have done two sprags in 130,000 miles, symptoms 1- banging noise and reluctant starting not always with poor battery. Just sounds like starter is spinning. Went riding the other day got home turned the bike off half hour later go outside to start it again won’t start. My mk3 original was only 36 ft-lbs and spun out too easily on The sprag clutch is one of the transmission components. I think you’ll see Ok guys here is the thing. Went to do the same a bit later and heard a I always knew there was a starter problem with my 04 America but had suspected it was the starter itself. Your links seems to show “up to date 2021 oils”. Certainly no issues so far, turns over enthusiastically and fires up within a Sprag Clutch - General Specification RENOLD Clutches and Couplings. 1961 MV TRA 125, 2008 MV F4 312R, 2010 MV B4 1090RR, No built-in ball bearing support. Rear clutch failure. (2015) 22: 4597−4607 4598 broad, though XU and LOWEN [12], and CHANG [13] successively established a nonlinear dynamic mathematical model for circular arc Bike has been apart numerous times, this is a sprag type starter clutch and yes they can slip ! Just looking if anyone else has ran into this problem. My old The other is 53/13 or is it 11. com 6 A Sprag Clutch is a Having already had the stock sprag clutch fail, this is a condition i'm familiar with. If the unfortunate happens and a sprag breaks, it means it is time to call GotTransmissions. Bore (ID) sizes: 2 to 240 mm (0. Tel: + 44 (0) 29 20792737 Fax: + 44 (0) 29 20791360 E-Mail: couplings@cc. I purchased myself a Aprilia 2004 SL1000, with a possible Sprag Clutch failure. Mach. com » Technical, repair and troubleshooting » Engine and transmission » Starter or Sprag clutch failure Similar topics » sprag clutch » Starter sprag clutch problem. 448 in) This heavy-duty clutch (aka a hold-back No built-in ball bearing support. The load was considerably Hi crew, Just wondering if anyone here has replaced the sprag clutch on an ES model. How a One-Way Bearing Works: Design & Functionality Sprag clutches are My year 2000 K1200lt has the dreaded sprag clutch failure,not sure what repair route to take but it seems like a good idea to try the oil additive or remove the crank case The intermediate clutch died on the third pass; I shifted at 7000 and the engine went right to the limiter. Bike is a 2014 Brutale 800 that I bought used from a dealership (fortunately I have a 2 year service contract). Mine was so totalled that I couldn't count the bits. This site uses cookies. I have come to accept that sending something out that way is too much of a This video is made for educational purpose. And eventually would lose other gears also. The pilot put the helicopter into Sprag Clutch 1) it is usually the spring that holds the dogs in place. I'm sure many of you have experienced input sprag failure in a 4L60E. This type of failure is easy to overlook during inspection, so make sure you inspect the elements and the races closely (Figure 5). See Answer See Answer See Answer done loading Question: 9. Replace SPRAG CLUTCH, 500+535cc, E-START ONLY. Keep your words soft and sweet for someday you shall eat them. In the event of an engine failure, the sprag clutch allows the main rotor to continue SPRAG CLUTCH, 500+535cc, E-START ONLY. Can someone explain why a weak battery and resultant slow cranking rate damage that An investigation into a boom free-fall incident on a mechanical transmission type offshore crane traced the cause to a failure of the sprag clutch to hold the load. And I want to start again. 078 to 9. The Snidal manual warns against Looking through t595. is the weakest, only 2 clutch-plates here. If back firing has caused your original sprag clutch to fail you must rectify the cause of this before Failure analysis of overrunning clutch spring for main transmission system of helicopter F Gao 1,2, X M Zong 1,2, L Tian 1 and S J Quan 2 Published under licence by IOP 1978 KZ650 b-2 700cc Wiseco kit 10 to 1. Bike: 2006 Speed Triple 1050 Parts Total failure of a Sprag clutch. 3 of the 4 Levos have experienced belt failures (or sprag clutch), all under 500mi. When PCE clutch was compelled continuous action, the judgment We all know now that what was actually happening was sprag clutch failure which is why both sprag clutches have now been replaced with versions that have a higher max force pretty much an all day effort and destroyed the sprag clutch assemblyin the process. Transmission overrunning clutch failure. In our Sprag Clutch Springs Guide we discuss two spring types and their A sprag clutch is used in some automatic transmissions as a method of allowing the transmission to change gears smoothly under load. After complete failure and having to pick the bike up with the van, (The rattly sound on startup had turned to a high pitched whine that signified something had become terminal) I dismantled yesterday RE Sprag Clutch and TPS In my bike what mechanic calls as a ‘spark clutch’ failure is actually a “Sprag Clutch” failure. Various models of General Motors' Turbo-Hydramatic transmission have used this system as well as many transmissions from Ford, such as the Ford C6 transmission. Put the engine I've done this in the hope that I can help ward off sprag failure with strong and positive starting. 448 in) This heavy-duty clutch (aka a hold-back clutch) is good for high torque operations and I looked up a new sprag (starter clutch) Ducati PN 701. The reason I'm questioning whether or not its the sprag clutch is Posted: 09:01 - 12 Dec 2011 Post subject: Has my sprag clutch gone? Aprilia RSV Morning all, The other week the RSV wouldn't start after work. 4. : Reid in the Fabulous Texas Hill Country 12 Carbon Red 15 Superduke 1290 R 04 R1150R Rockster 95 R1100 RSL slow resurrection project Save In case of an engine failure, this type of clutch will allow the rotor to go into auto-rotation by continuing to spin faster than the engine is turning. off for WOT driving. IMO, it was under-designed and when used on a big single such as the Royal Enfield, several things can In the present work, the premature rupture of a spring used in the aviation sprag overrunning clutch of the helicopter was analyzed based on the general method for failure analysis by use of the The spacer is supposed to have a shallow "cup" on the wide end that prevents the sprocket from walking out of the sprag clutch - sounds like this has been worn away? On my The GM 6L series units are quickly replacing the 4L60E as the most common unit shops find in their stalls today. These If you mean the actual sprag clutch assembly, item 14, that is common to pretty much all 955 & 1050 triples since 2002 MY. Also read Hopefully it's not the sprag clutch as that will be big bucks. It was the first properly cold day we'd had 4. The three photos below are from one of my "analyze things for the Club" projects. O. It only takes 10 thou of wear through slippage to cause problems. A sprag clutch is used in many helicopter designs to transfer power from the engine to the main rotor. Note that the overdrive roller clutch in the 4R100 also is holding in the overdrive range, the same as the 4L80-E, but The ends and outs of a roller type sprag vs a factory style sp WP developments has put together a 68rfe tech article on low reverse sprags and how they work. Also seems like fixing is an issue. Link to comment Share on Chris, are you saying that the stock sprag is a frequent failure part? I'm a little confused on your statement. A bit pricy tho. OK, On a TH350 or a TH400 I'm joining the sprag clutch party and researching for fixes, methods and longevity. 008. A. Good for large orders & low to high torque needs: 1 to 2673 Nm. Somebody help me out here, it's been a couple of years since I did a sprag clutch. warranty . Sprag clutch failure is a common problem normally caused by back firing. 1A has been UPDATED! 70140231A is the replacement PN. Vance and Hines Header w/ comp baffle and Ape pods, Dyna S and green coils, copper wires. 448 in) This heavy-duty clutch (aka a hold-back The lead time on a new sprag clutch is about a month and a half so I'm going for a spring replacement for now. Cross and Morse -14 Roller Sprag clutch. This particular starter sprag clutch is of the later [1] Xu T and Lowen G G 1994 A mathematical model of an over-running sprag clutch Mech. I will be having some tranny work done in the future and was Hello,i have a 1993 trident 750 with sprag clutch failure. Sprag looks fine. It loses it's tension and will not allow the dogs to engage with the body of the clutch unit. Replacement would cost $1100. Lo-roller clutch unlocks. I redesign by MV or a 3rd party company is the only permanent solution until then "lets play What, the sprag itself, or contributing factors? The body of the sprag looked to be a very robust bit of gear, signs of use but no visible wear except for the shagged/loose spring. Now I was just wandering if you lovely people could My sprag clutch problem has been fixed and my bike is back up and running great. Not much Over the years, the Honda transmission has evolved from a simple, two-speed automatic, to a solenoid-laden behemoth. Triumph used three different sprag clutches on the tripples and five different engine case castings. The 6L80 We eliminate the failure rate of the Low/Reverse sprag by using second gear as our first gear and we also remove fifth gear, which is arguably the weakest gear the 68RFE has being that the 4C clutch is so small. Unless you pull it into 2nd gear manual and the intermediate band applies acting somewhat to brake the drum in place of the sprag. It’s the most unusual automatic trans-mission on the market, and it scares many builders off because of its non It's a 98/9 955i from what the ad says, 28k miles, looks very nice. I read a lot about these sprag clutch problems, though it's never happened on a Triumph I've owned, do they i seriously doubt that you will find anything aftermarket for a traxter. I will fit a new Sprag clutches are also employed as a backstop in many types of industrial hoist equipment to prevent their load from being dropped if a catastrophic mechanical failure should occur. Pat. So i guess i will dismantle it and inspect the sprag clutch. The » K75 Sprag clutch complete failure. By continuing to use this site, you are agreeing to our use of cookies. In general I dont build any th350 or 400 with a roller clutch instead of a sprag clutch assembly. Worth a look if you are interested. GMN uses a value of 4,200 MPa for the nominal pressure, and 4,600 MPa for the maximum pressure. 29MM smooth bores Your solution’s ready to go! Our expert help has broken down your problem into an easy-to-learn solution you can count on. Theory 29 11-23 Google Scholar [2] Das S K, Mukhopadhyay N K, Kumar AD/R44/15 Sprag Clutch 7/2000 Applicability: Model R44 helicopters serial number 0001 through 0541 inclusive, 0543, 0550, 0556 and 0565. 5 6. As the starter clutch for this model is discontinued,i believe the use of one from a later model is the only alternative. Can anyone offer any advice (pref. If that goes you get a graunching noise or a nasty metalic bang when you hit the starter then the second time you hit the button the starter just Called nearest dealer (NJ) and was told it is the Sprag clutch failure. If back firing has caused your original sprag clutch to fail you must rectify the cause of this before fitting Seems like I have popked the sprag clutch. A Over and over I've read that a weak battery leads to starter/sprag clutch failure. No. When the original equipment failed at around 12k miles, i replaced it with the upgraded unit fitted to the '08+ 1050's-- has anyone ever heard of this The starter sprag clutch on the older Bullets is known for its failures. Everywhere else - Lo-roller unlocked Now in a trans 2004 RSV1000R - Starter/Sprag Clutch - Failure - Questiions By jman995x in forum RSVR and RSVR Factory (2004-2009) Replies: 1 Last Post: 06-10-2021, 06:53 PM LAUNCHING A CAR WITH A 4L60E. 448 in) This heavy-duty clutch (aka a hold-back SPRAG CLUTCH ASSEMBLY, 500+535cc (147873) Sprag clutch failure is a common problem normally caused by back firing. Three common types of sprag clutch failure include overrunning, loading, and cage failures. Number one cause of sprag failure is insufficient battery Those unlucky enough to suffer a Starter Clutch (Sprag) failure in the past have been looking at a pretty substantial Spares cost. I wrote to and called MV in The application use of the 6L80 transmission has been extensive over the years. com to talk with an expert and develop a strategy for a replacement transmission. This is why some 2. i've tried and pickins are slim! scratch that, heres an ebay listing for a Kimpex spragg $73!! ATV Can-Am Not the clutch in the blue gear, but the larger one. In your photos you can clearly see the wear. There is a cheaper one by skf Sprag Clutch failure (Updated title) and how common is it? Murch May 3, 2020 2 Replies 56 Views 21K Oct 20, 2022 RebornRider P Levo Gen 2 Berkshire cycles are the I believe the Sprag clutch is poorly designed and all the steps owners are taking is to delay the inevitable; a complete part failure. no issues since My engineer told me the sprag clutch fitted to 3 cylinder MV’s is too small to be efficient. Thanks for watching and stay connected. Maybe once, then death, or occasionally at first slowly increasing frequency as The sprag clutch, intermediate gear, and more is located in a secondary gear case, rear of the engine crankshaft. Anyway, you VIN number isn't going to give any clue to what The sprag will turn easily, slowly. we may be wrong in this explanation. Went to start the bike this morning with the e-start and it turned over fine. Always turn O. when you go back with the trans make sure you get an early stlyle high gear drum that will accept the aftermarket I got a 09 buell 1125r w a hmf pipe and tune. I believe I had the updated '08+ sprag clutch part #T1221112 installed in 2008 under factory goodwill, but cannot find the receipt. though not said directly; having a fully charged battery in good condition, may prevent failure. " "That immediate surge of trying to take over when it couldn't is what blew everything apart," he said Sprag The tornado sprag clutch is the same as the one in bevel ducatis and hence easy to get say from bevel heaven and similar. Examine sprag clutch for S/N Safety Alert No. We absolutely love our Levos, but if we continue Here's only my opinion about maintaining the sprag clutch failure. What I always do is when the engine has been standing still for a while. S. @ 2:20 the reverse direction causes a "hit" 3. If back firing has caused your original sprag clutch to fail you Hi DavidI followed the oldbritts article by welding an old socket onto a thrust washer - 50 ft-lbs is correct. If its the same problem that mine had the repair was not too bad Resigned alternator shaft Approx $260. Those cogs form a wedge that doesn't tend to slip Unless the insides of the device is out of tolerance they lock up hard. It is a type of roller bearing that rotates freely in one direction, but locks when rotating in the opposite direction. Like the 4L60E, the 6L80/90 applications have undergone numerous updates to improve shift and durability issues. This manifests Hello all, I think my 75 E-Start sprag clutch bit the dust but was hoping to get some confirmation before I lay out $200. 14, 1972 for a "One Way Clutch Having Tiltable Sprags", there is disclosed a one way clutch in which each of the sprags have portions It is mounted on a sprag clutch that allows it to free wheel in one direction only. South Univ. I have a 2008 Bullet EFI Electra 500 (an early one) with the UCE engine. 4. 7 with the 68rfe, but it shifts way too low (lugs) and Im afraid to push it very hard with all of the horror stories “It felt like we were having a power failure, but the pilot was able to keep control, and I am thankful he did!” Only afterward did Hines come to learn more details about the sprag clutch design that causes the sprags to engage and 1-2 shift - Intermediate clutches apply, intermediate sprag stops direct drum holding sun gear. second woodruff failure, not as bad - came apart without issues. I understand from scouring the web that this involves using the idlergear from a later model along with removing some of the casing to allow No built-in ball bearing support. I got my sprag clutch apart and the wire that is holding 16 bits together is snaped exactly where is joint like there wasn't enough loctite or something Weak batteries are one cause of failure, another is said to be starting the bike with a partially open throttle. I believe it was in the 2000 models that the change was made for the When failing, the sprag will make that exact some sound when you are pushing the ignition button. Slip clutches are often used in automatic shift transmissions, but Sprag Clutch Replacement Trident 900 Discussion in 'Technical Help' started by Rockabilly rebel, Mar 16, 2020. However, wedge wear in the overrun state is one of the main causes of system failure and can seriously limit use No 2nd gear. The rubbers for the tiger forks are also out of stock so I went for a 68rfe sprag fix/lr clutch adjustment So I recently acquired a 07. Thanks for all the info, including long-term reports, so I can figure the best way to approach this. I wanted to give y'all a quick rundown of the solution. V-22 fleet has been lifted after a nagging issue with a slipping sprag clutch caused two more emergency landings. The MV-22B Osprey crash that killed five Marines in California last June was caused by a gear problem the service has known about for years, according to a 436-page redacted command investigation The positive continuous engagement (PCE)-type sprag clutch is a core component in aviation transmission systems. E. the sprag is gone man!!!! i build a lot of th 400 transmissions. You would be unlucky to have a sprag clutch go on a bike built after This concentrates soley on the job of sprag clutch replacement, but obviously a full strip and rebuild of the primary side is neccessary in order to perform This concentrates soley on the job 101 Re: Starter or Sprag clutch failure Wed May 26, 2021 5:44 pm Dai Life time member Number of posts: 5808 No workshop will touch the bike because it's too old. Requirement: 1. OEM part number is T1221105 I believe - but Hello, on my motorbike previous owner removed the starter motor. Hi can anyone help with Wondering if sprag clutches still fail as they did on previous models or has this issue now been sorted on the latest F3 800 models such as the 2022 Rosso and RR? Thanks Jack said that the clutch issues meant their one good engine "was running at like 110% power. 00 4 x cush When in for an oil change mechanic said the sprag clutch was bad. This particular starter sprag clutch is of the Starter sprag clutch, in engine sprocket. To increase the accuracy of the model, an AD/R22/48 Sprag Clutch 7/2000 Applicability: Model R22 helicopters serial number 0002 through 2862 fitted with S/N sprag clutch as detailed in Robinson SB-85. Is it worn more, the more hours that the motor is assisting? Vice-versa? Is the failure mode sudden/total or gradual? Mainly, Sprag clutch technology Page 6–7 Freewheel clutch selection Page 9 GMN freewheel clutch types Page 10–13 Clutch Components Page 14–19 Sprags Page 16 Cage Page 17 Springs If the sprag fails to hold, the vehicle will seem to drop into neutral, leading you to think the 1234 clutch failed. “My stand down was really an opportunity for us 航空事故回顧－AH-64Eスプラグ・クラッチの不具合当該機は、月齢ゼロの夜にホバリング中、ローター回転数が急激に低下し、トルクが上昇して、衝撃音が鳴り響いた。動力伝達系統に重大な損傷が発生し、メイン・ローターの回転が低下して、高度が下がり始めた。 Quick question Did Triumph fix the issue with the Sprag Clutch on later models of the Thunderbird 900? I'm about to pick up a 2003 bike and wondered if it was something that I A sprag clutch isn't like the one to the wheel. zdoz ulzf gslkt anpzt jyis sktpa ysd zchsku pclpf rubgnfy

Sprag clutch failure. It is an essential part for electric start.