trouble

[99blaster:)]

ok so i was out riding last week when my blaster just cut out and died. i changed the plug and it fired rite back up and ran fine for another 5 minutes or so. it was running fine with plenty of power... so i assumed it was just a fouled plug. it did the same thing again and continues to do so, but when its running it runs strong with plenty of power, any help would be appreciated

 

[sicivicdude]

Have you thoroughly cleaned the carburetor?

What are the results of the cranking compression and leak down tests?

 

[cole454]

Any engine mods? Have you done a plug chop?

 

[99blaster:)]

i havent done a plug chop but it is piped and jetted etc... the carb was recently cleaned and ill do a comp and leakdown test later tonite.

 

[99blaster:)]

oh and its bored 20 over w a hotrods crank and reeds and stuff

 

[sicivicdude]

Bored .020" oversize, a replacement hot rods crank, reeds, and "stuff" probably won't affect the jetting but a pipe, filter, and the airbox lid removed will... who did the jetting? you?

How'd your plug chops look before?

It's possible that you have water in your gasoline. The pilot jet sits about 1/2" higher than the main in the float bowl so it will idle and take off fine but as soon as it start sucking down water, it bogs out.

It's also possible you have worn rings or a gouged piston causing low compression.

 

[99blaster:)]

no i didnt do the jetting but i fixed the problem turns out the teather switch was shorting out on the frame due to a bare wire