Question about 1981 Honda CBX

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Have an 81 cbx with a hindle exhaust system, getting mild and fairly constant backfire, dealer told me it was probably inherent with the aftermarket exhaust and wouild likely not be able to eliminate ,it this so?

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I had a '79 CBX with RC headers which required rejeting after installation. You need to rejet the carbs, start by going up one size on main and pilot jet. Yes, this is pain because you must remove the headers and front engine mount so you can tilt the motor down to remove the carbs. Also check the timing, because after installing headers, it will change. Been there, got the T-shirt.

Posted on May 07, 2010

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Check the diaphragm rubbers in the carbs for wear and tear..new ones cured a similar problem that i had with my 82 model

Posted on May 07, 2010

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I had a kawasaki that did the same for five years, never seem to hurt anything

Posted on May 06, 2010

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My sportster backfires constantly. How can I resolve this problem? I had the carburator cleaned and adjusted, but it still backfires.


Ok, due to different terminology used by different people, I'm going to assume that by "backfire", you mean it pops through the exhaust system when you back off the throttle. On stock exhaust systems which use the "crossover" connector to connect the front and rear pipes, the backfire is usually caused by an air leak somewhere in the exhaust system.

When you back off on the throttle, the mixture is usually too rich to burn in the exhaust system. But, if you have an air leak allowing the scavenging effect of the system to **** air in, the mixture becomes combustable and is ignited by subsequent exhaust pulses.

Check your exhaust system gaskets and replace them if necessary. This should stop your problem. Rejetting the carb may be necessary as well.

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hi,might be able to help,i am hoping that the backfire is on the off throttle,if it is then is quite easy,check the exhaust system for air leaks,air gets sucked into the system through leaks,mixes with the hot exhaust gasses,leans out the mix inside the pipe then bang..1 backfire,the other cause could be particularly if you are running an aftermarket exhaust is that the system is running to lean and needs to be rejetted most times though it is air getting into the exhaust through badly fitting seals and gaskets..hope this helps...cheers ian

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Fix is to replace the upstream 02 sensor.

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