UK Karting - Notice Board (General Karting) : Cosgrove

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Cosgrove
Posted by 'itpro' on 30 Mar 2009 @ 12:16

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itproJoined: August 2001
Total Posts: 6
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There are basically three things which can cause 'once per revolution' chain problems. (Having said that, there are MORE if the tight-loose-tight is NOT EXACTLY once(or more)per revolution).

1) The Sprocket
2) The sprocket Carrier (plus 'key' if it is oversized by mistake)
3) The Axle

Test these with the 'bent coat hanger' technique.

a) Start witb the sprocket, if it shows any 'run-out' compared to the pointer, you MAY have isolated the problem...
B) However, it COULD be the carrier (and key)..... so... remove the sprocket and move the pointer to point EXACTLY at the carrier. Becasue the amount of movement in the carrier my be smaller than in the sprocket, mount the point even CLOSER to the carrier to detect it. If there is any 'run out' then you can assume the spocket was not the ONLY problem. It could STILL be the axle, so we'll check in a minute. If it does NOT 'run out' then the problem WAS the spcoket... fit a BRAND NEW one and re-test.
c) Remove the sprocket carrier and mounte the pointer EXTREMELY close to the axle. Rotate as before and if the point-to-axle-gap changes one FRACTION... you've got a bent axle or bearing problems. If it does NOT 'run out', then the problem WAS in the Carrier.

It's simply a process of elimination.

The quicker option:-

Borrow a KNOWN to be 'true' sprocket carrier and sprocket from a colleague. If it DOESN'T tight-loose-tight.... it was either your sprocket or carrier. If it DOES.... it's most prabably your axle.

Ian

Message Thread:

Chain half loose half tight by 'DanMax66' (29 Mar 2009 @ 0:04)

Re: Chain half loose half tight by 'glassback' (29 Mar 2009 @ 0:58)

Re: Chain half loose half tight by 'itpro' (29 Mar 2009 @ 2:55)

Re: Chain half loose half tight by 'pratty' (29 Mar 2009 @ 10:19)

Re: Chain half loose half tight by 'DanMax66' (29 Mar 2009 @ 14:30)

Re: Chain half loose half tight by 'DanMax66' (29 Mar 2009 @ 14:39)

Re: Chain half loose half tight by 'kartcollector' (29 Mar 2009 @ 20:18)

i need help aslo pleases with this by 'cosgrove78' (29 Mar 2009 @ 20:28)

Re: i need help aslo pleases with this by 'jonny85' (29 Mar 2009 @ 22:56)

no i have not.......but.... by 'cosgrove78' (29 Mar 2009 @ 23:07)

Re: no i have not.......but.... by 'jonny85' (30 Mar 2009 @ 8:24)

Cosgrove by 'itpro' << You are here!

Re: i need help aslo pleases with this by 'invisibleracing' (31 Mar 2009 @ 22:01)

Re: Chain half loose half tight by 'DanMax66' (30 Mar 2009 @ 23:09)

Re: Chain half loose half tight by 'kartcollector' (31 Mar 2009 @ 8:11)

Re: Chain half loose half tight by 'DanMax66' (31 Mar 2009 @ 22:49)

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