Motorcycle Mechanic Assistance Please?

  • Thread starter Thread starter Tracy
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Tracy

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I drive a Honda CT-90 Trail Bike. Why does is destroy spark plugs? Here is the deal. I install a new plug and it runs perfectly for about 30 hours, then it quits right while driving it, and it will not start.

I clean the plug thoroughly so it looks like new, proper gap etc. It will not run. I pull the plug out, and with the wire attached I can kick ithe engine over and the spark looks good at the plug. I put the plug back in and the engine will not run no matter what I do.

I put in a new plug and the engine starts on the first kick and runs perfectly. I have tried three brands of plugs, and they are all the same. What is causing this machine to destroy spark plugs?
 
Just cleaning the tip of the plug will have no affect.
The porcelain and inside wall of the plug have to be spotless - otherwise it will be to fouled to fire (spark).
Check the air cleaner - if it's dirty, it will cause the engine to run rich (to much gas) and foul the spark plug.
Depending on what year it is and how many miles is has, the piston and rings might be worn out causing the crankcase oil to slowly get into the combustion chamber and foul the plug.
Check the cylinder compression.
Leaking valve guide seals will do the same thing.
 
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