Question about 1998 Honda CBR 400 RR

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Spark plug gap

What should the spark plug gap be on a 1991 honda cbr 400rr?

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  • Anonymous Mar 21, 2014

    spark plugs are black ,setting is 31 to 35 have them set at 33 what to do?

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Don't change the setting on the plug. The 400's are happiest when you just plug in new ones and ride. They like NGKs the best. There are two types for the 400. One runs hotter. This choice will depend on which country you live in and what the ambient temperatures are.

Posted on Nov 10, 2008

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1 Answer

Why would my 1999 honda cbr 600 f4 boggs not letting me go past 55mph


Dirty spark plugs
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these are dual spark coils. this means that each coil sparks twice on companion cylinders.two leads out of one coil to the two middle cylinders and the two leads out of the other coil go to the two outside cylinders it doesnt matter which coil,but usually one of them has two long leads and the other two shorter leads

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Hi my honda cbr 600 fl 1991 the bike pulls great


im not sure if this model has a fuel pump but follow your fuel line and see if it does wen u find it remove black plastic cap and check the points contact breakers are in good conditon ie not worn uneven or worn out and that they open and close.check your air filter spark plugs and your carbs could have a blocked jet so get them cleaned and balanced.

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In general, as high as possible. But the real test is how close the readings from the cylinders are to each other.

May 09, 2009 | 1991 Honda CBR 400 RR

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Did you gap the plugs to factory before installing?
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Wont start


the old petrol has buggered up the jets a good carb cleaning will fix the carbs now drain the old petrol out and get new dont try to mix old and new gas it does no good please give us a rate hope this helps

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