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There are many reasons that a vehicle will backfire through the carburetor. What determines the cause depends on what condition the backfire happens. Is it a steady backfire at idle or does it start when you are accelerating ? Do you live in a wet climate or dry? Has the engine been wet?
Backfiring is caused when the exhaust valve is open during the firing or compression stroke of a certain cylinder. For example, a broken spring will not close the valve completely. A bad camshaft lobe will cause a back fire, if you have a distributor that got wet the spark could cross over to another area wire and cause the problem causing a missfire. If the wires were put on wrong after putting in plugs it will cause a missfire.
remove the carbs and have them professionally overhauled
indicates a problem in the high speed circuit , probably a blockage
might also be an incorrect float level that is not allowing enough fuel into the bowl for hgfh speed operation
More than likely the carbs are plugged up(makes the no idle, popping from the intake or pipe and sometimes hard starting), and/or a vacuum line(s) Is loose/broken, and the carbs are probably out of sync (makes the high sticking idle/little to no idle). I have many article written about cleaning the carbs and fuel system. Get the carbs and fuel system cleaned out if you are not familiar with the process.
Hey Anon, sounds like you may have done something wrong when reassembling your Blaster... When you "cleaned" the carb, you may have reassembled it incorrectly.. This sounds serious!!.... this situation is difficult to diagnose on-line.. I wish you were near me.. . (North Alabama) .. I am a 40+ years Yamaha Factory tech... I could fix it...
Your bike has 4 carbs and they are not in sync with each other. This requires hooking a gauge to each carb individual and adjust till each one is exactly the same as the next. The imbalance can be from mis adjustment of just dirty carbs. You will also have balance problems if any cylinder gets lower compression.
You probably have a bad spark plug or spark plug cap/wire or both, it probably is not the carb at all. try changing all your plugs and see if it fixes it.
Exhaust 'pops' is generally caused by unburnt fuel igniting in the exhaust, air leaks can cause this too.
When you do any carb work its always best practice to check the carb balance and idle mixture settings.
What colour is the spark plug? http://www.dansmc.com/Spark_Plugs/Spark_Plugs_catalog.html
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