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Post Info TOPIC: Electric Starter screeching noise after top end service


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Electric Starter screeching noise after top end service
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Hey Guys,

So I pulled the top end on my TTR250 to service the head gaskets, valve guide seals, and lapped the valve ax I did not remove the e-s before removing the top end, and removed everything including timing at tDC. However I did accidentally  the stator clockwise a coulle turns which resulted in a slight screech from the E Start.

 

i our everything back together, hit the start and now I have this noise:

 

http://tinypic.com/r/u3j9j/9

 

What can I dofrom here to fix this?



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Hi Dan and sorry to hear of the problem cry

Not sure what you mean by "turning the stator anticlockwise a couple of times" as the stator is fixed in the generator cover confuse

Could you confirm that you set the valve timing correctly at TDC with the cam lobes facing outwards as per the photos 2/3rds down this page http://www.ttr250.com/Removing_Cylinder_Head/TTR_head_removal.htm ?

Can't really think of anything else without listening to the video. Maybe upload it to YouTube if you can't get Tinypic to play ball?

Brian



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Hey Brian,

Sorry- from the crankcase, when turning the motor to TDC I turned the motor the opposite direction and I heard the electric start make a squeak. The motor was at TDc, lobes outward and dashes parallel with the head.

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Here is a YouTube link youtu.be/Yb0XFnt8dps

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OK - that doesn't sound good!

If my logic is correct then the sprag clutch should have free wheeled when you turned the engine backwards rather than engaged the starter.

How old is your sprag clutch and are you aware of it getting noisier recently?

What I am thinking is that, as can happen with a worn sprag, it has jammed itself on the boss of starter gear 3 such that when you start the engine it isn't disengaging and the screech is the starter motor being turned at great speed!

I hope I am wrong but a simple way to check is to take the starter gear cover off (just the three bolts) and see if the sprag is working properly. Take out starter gear 1 and try turning the exposed teeth of starter gear 2.  It should freewheel one way but not the other. If it won't turn either way then the sprag is goosed.

Brian 



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In the event the sprag is no good, what am I looking at as far as a rebuild or parts?

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You will need: Sprag clutch and possibly generator cover gasket

See http://www.ttr250.com/Sprag_replacement/TTR_sprag_replacement.htm which will show you what's involved. It's actually quite a quick job and well within the capabilities of a home mechanic wink



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