Vintage Dirt Bike Q & A

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PostPosted: Mon Jan 26, 2004 8:01 am 
Does any one know if the spark plug cover should be resistive or not for the 78 cr250? The guys at the honda shop sold me a resistive cover with 5K ohms of resistance. I don't think it should have resistance in it but rather should be straight through i.e. zero ohms. This would account for my wide open throttle problem skipping. Can someone measure theirs and post the results?

Dave Anderson


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PostPosted: Mon Jan 26, 2004 8:02 am 
the r in a plug is for the hiway cruzers /propuse of less static in intercom on the bike(helmet2helmet)


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PostPosted: Mon Jan 26, 2004 8:03 am 
That resistance is correct. If you had zero ohms you would have no current. The relationship is V=IR, where v is voltage, I is current, and R is resistance. My MR250 has 5k ohms.

Try this link for troubleshooting:
http://www.angelfire.com/ab/motorcycle/troub.html
Specifically
http://www.angelfire.com/ab/motorcycle/stroke22.html

Check everything on the poor high speed operation list and you will find your problem. (probably a coil/timing problem)


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PostPosted: Mon Jan 26, 2004 8:06 am 
:lol: Zero ohms is a perfect connection. Measure a piece of wire or steel. Zero ohms.


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