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Tom_H123

Won’t start but occasionally pops/bangs

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Had a ride the other day and the exhaust went pop/bang and then cut out and wouldn’t start again... every few kicks it makes a pop/bang, I have checked the spark and it’s fine.... also checked to see if flywheel was spinning freely and it wasn’t... will I need to get the flywheel off to check the woodruff key? 

Also spoke to my local trials bike shop and they said it could possibly be the CDI that has given up... how could I test to see if the CDI is the problem? 

Any other ideas?

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Its flywheel off to check the key...don't know how to check the Cdi ... Can you borrow one from another bike to try?

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Hi, if your flywheel isnt spinning with the engine then that would suggest a sheared woodruff key.

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51 minutes ago, tshock250 said:

Or it is spinning but its shifted to the point where the timing is screwed.

 

13 hours ago, 2smoke said:

Hi, if your flywheel isnt spinning with the engine then that would suggest a sheared woodruff key.

 

15 hours ago, thall1 said:

Its flywheel off to check the key...don't know how to check the Cdi ... Can you borrow one from another bike to try?

I will get the flywheel off as soon as I can, and no I haven’t got a CDI that I can borrow off another bike sadly

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