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Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
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Old 15 Nov 2008
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Join Date: Dec 2007
Location: Christchurch,New Zealand
Posts: 95
Successful sprag clutch repair?

Has anyone ever had any success in repairing their sprag/one way clutch on the starter system? I have removed mine from the bike altogether due to it locking up on the sprag clutch.
My 1VJ is really starting to annoy me with not kick starting when hot.It'll start fine when cold,fine when ridden to work.But as soon as I do a trail ride or ride a decent distance....Good luck trying to start it again.The last straw was yesterday,nice ride through back country NZ roads,waited for the other rider to cross a (very shallow) river,went to take off again and the bike stalled.Kicked the damn thing for near 30 mins,fuel on,fuel off,full throttle,no throttle,wound the mixture screw both ways from where it was set but nothing worked.So we sat down and let it cool off.After 30 mins,it starts 2nd kick!

Now the day before I had the same problem....I had a guy come and ask if everything was ok and did I need a push.Long story short,he said he had problems with his Ducati's sprag clutch doing what mine did and locking on and driving the starter motor while the engine is turning.He said you can replace the spring/s on the clutch to put tension back on the locking pins or whatever they have.Looking at the XT design,it looks to have one big spring round the outside.Is that correct? I didn't manage to get my flywheel off last time I tried to fix this,so haven't seen one other than a microfishe part pic.

If I can repair it for a few $ I'll be happy as Yamaha NZ want $352 for the unit ex Japan.
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