Question about 2005 Honda CB 250 Nighthawk

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Motor surges at full throttle

How do you set timing

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  • paul erickson
    paul erickson May 11, 2010

    are you sure you want to mess with the timming

    i think you have a fuel problem



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The timing is not the problem if your bike is surging at top end. The timing is fixed on these models and it's not like the old days or like a car. Your problem can be one of many.
First: does the bike idle ok after it is hot?
Second: Have you changed the air filter to an after market type? Changing the filter to an after market filter will lean the motor out which will cause a "surge" at full throttle. You will need to possible jet the motor richer to compensate for the leaner filter design.
Third: Try rolling out og the throttle from full throttle by about 1/8th and see if the engine RPM's increase and the surge goes away, if so the motor is to lean.
Let me know the answers to these questions and I can help you resolve your problem.
Third: how long has it been since you have set the valves? a tight valve can cause many many problems including this one.

Posted on Nov 30, 2008


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