Front sprocket play

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Re: Front sprocket play

Post by mizzed on Sun Oct 11, 2015 9:59 am

In and out movement is around .7mm and at the end of the video is the side to side movement, as seen 0 movement in that axis.
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Re: Front sprocket play

Post by curl666 on Sun Oct 11, 2015 12:01 pm

I'll go check shortly.

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Re: Front sprocket play

Post by curl666 on Sun Oct 11, 2015 12:34 pm

I've played with my shaft all morning, in and out free play 0.66mm

Smile

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Re: Front sprocket play

Post by phil990 on Sun Oct 11, 2015 4:04 pm

I would say that when you tighten up the sprocket nut:

The nut tightens against the washer.
The washer tightens against the sprocket.
The sprocket tightens against the cylindrical spacer with the "O" ring at the back.
The cylindrical spacer tightens up against the inner race of the bearing.
And finally the inner race of the bearing is against the step in the body of the drive shaft...

Some longitudinal movement when the sprocket is off but not when tightened up.

If the sprocket nut is not tight I think the "O" ring will let oil past?

You can see the inner race of the bearing if you pullout the cylindrical spacer. The bearing should not move longitudinally...

But then what the f@@k do I know...


Last edited by phil990 on Sun Oct 11, 2015 4:10 pm; edited 1 time in total
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Re: Front sprocket play

Post by phil990 on Sun Oct 11, 2015 4:08 pm

Care of good old Google.


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Last edited by phil990 on Sun Oct 11, 2015 4:16 pm; edited 1 time in total
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Re: Front sprocket play

Post by phil990 on Sun Oct 11, 2015 4:14 pm

I've seen cracked casings around the drive shaft bearing. This would allow end float if the bearing was loose in the housing. Luckily this is normally obvious as gearbox oil is pissing out.

Overtight chain?  Any oil in gearbox?
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Re: Front sprocket play

Post by curl666 on Sun Oct 11, 2015 5:59 pm

The free play on my Ktm 0.66mm was measured whilst the chain and sprocket(s) are fitted and tight.

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Re: Front sprocket play

Post by mizzed on Sun Oct 11, 2015 7:07 pm

No oil leaks, but if yours has the same sort of movement I'm guessing it must be right
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Re: Front sprocket play

Post by crm250dude on Sun Oct 11, 2015 7:21 pm

I cant see 0.04mm being much of a difference ... lets hope the new woodruff wassisname and the tightening of the other bolt rectifies it

fingers crossed
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Re: Front sprocket play

Post by curl666 on Sun Oct 11, 2015 8:05 pm

If you are fitting a new oil seal around the output shaft, the 2 stroke o ring which it sits on its a touch thicker for a better seal.

Part number 0770250020

Also worth noting that aftermarket sprockets can be a touch thinner than standard, so the pressure on the sealing surfacing from the domed spacers and bolt is not as good. Which is often why you see a lot of posts about the RFS oil leaking from around the shaft.

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Re: Front sprocket play

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