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Discussion Starter #1
Hi my motor was rebuilt started running it in and was running the fuel out of carby then as the rev's got high I thought it could be to much so I held the kill switch but when I let it off it fired back up and got a massive back fire

Now it's kicking back up on kick starter when I try kicking it

Was told its not the timing but can't see what else it could be
 

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Hi my motor was rebuilt started running it in and was running the fuel out of carby then as the rev's got high I thought it could be to much so I held the kill switch but when I let it off it fired back up and got a massive back fire

Now it's kicking back up on kick starter when I try kicking it

Was told its not the timing but can't see what else it could be
It could be a sheared flywheel key that happened when it kicked back however if it back fired in the first place the timing was probrobly slightly off
 

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Discussion Starter #3
Replaced the key and flywheel from another motor I had just in case it was that and it was still doing the same thing hopefully it hasn't damaged the grove on the crank
Going to play with the timing and see if it stops
Don't have the patience or wanting to spend money on it as I had done that rebuild to sell it
Thanks for your input
 

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Discussion Starter #4
Also when I line the timing mark up on flywheel with the mark the case the piston is not TDC and about 4mm below TDC
 

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I see it has been a while since your last post. Where you able to resolve the issue and if so what was the problem?
If the mark on the flywheel is supposed to indicate TDC and if flywheel key and groove are fine, then have a bent con rod, or the crank pins have slipped in their press fit holes although I doubt this would happen.
 
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