by 3 hours ago
ANSWERS: 4
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The basic idea is that unburned fuel and a spark (or heat, enough to cause combustion) are getting in the exhaust manifold at the same time. This could be caused by a carbuerator needing adjustment, the timing could be off or one of the cylinders isn't firing at all. Time for a tune up! :)
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Unburned fuel in the collecting in the catalitic convertor or the muffler is the cause. The reson for the excessive fuel in the exaust system varies usally carburator forcing to much fuel in or retarded ignition timing. I've also seen leaky exaust valves cause backfiring but that is very uncommin.
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Those answers correct, but I want to add that v-tec tends to have less back fire. Backfire occurs when you go from a very high rev to a very low rev (and vice versa) very quickly.
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the simplest backfire, one thats coming from the motor not fuel in the exhaust is because of the spark firing at the wrong time. 9 times out of 10 you need to readjust the timing, or your advance isnt able to keep up. i work on race motors and revving up and down really fast doesnt usually cause a back fire if the engine is timed right. your carb is probably fine because if your getting too much fuel and the spark comes at the right time both valves are closed it doesnt come out as a backfire. if one of the cylinders isnt firing all the time its probably getting the spark when it doesnt need it. as for the engine getting old, the valves probably needed to be adjusted or replaced because of wear and tear they take alot of abuse.
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