I have a 93 Honda CB750 Nighthawk Motorcycle, my friend installed headers on the bike and removed the stock exhaust. Now the bike runs rough I have to rev it up while stopped at redlights, should I replace the jets In the carburetors since the bike is now getting much more air, shouldn’t the carbs need more fuel, when I give it gas it sputters an coughs some, I can play around with the choke and it helps a little. The bike doesn’t act up as bad if I gapp the throttle and accelerate fast it kinda clears a little until I let off the gas. Should I replace the stock jets in my carburetors with bigger ones, and if so what size would be recommended. Thank you

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My decel popping stopped as soon as I removed the air injection, but started back with aftermarket pipes. I adjusted the idle mix screws to richen it up and the popping almost went away.
Find answers/discussion at bonnevilleamerica dot com forum. Great sources for parts are bellacorse dot com, and newspeedmaster dot com. I don't know any European sourses for aftermarket bits.

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I had the same problem, Turns out that my shims were finished, replace the chims and check clearences.

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Can anyone help me with the eco-trottle switch when I switch it on it seems to run the same idle whether I have it off or on, what could be causing it not to work, is it a bad switch or I am running 89 octane could that be the problem.

Thanks
Alex

mark woodring

• 498 Answers
• Posted on Jan 05, 2010

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mxtras

• 194 Answers
• Posted on Jun 10, 2010

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It sounds to me that your carbs might be a little gunked up - you mentioned the gas may have been old, so it's possible that the smaller (idle) jets are slightly plugged up. Fresh fuel might do the trick and/or you could try using a fuel system cleaner and water remover. This problem might 'solve itself' with a little time.

As far as the backfire - this might be either from the carb issue or it could be related to that rattle you mentioned - you could have a loose connection at or near the head - this can **** air and cause a backfire.

I hope this helped!