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Hello, I recently bought a used 1992 750 about 25,000 miles and I am having a problem with it popping everytime I decelerate. I have checked the plugs to see if they are burning correct and the front cylinder is running lean and the back cylinder looks good but the back one is the one that is popping. I checked the fuel/air screws and they were way off. one was about 3/4 and the other was about 1 3/4 out so I took them both out to 2 turns and now it won't even start ( ran battery dead ) does anybody have any suggestions? I am waiting for the manual to come in the mail but I can't wait to get on the road. Thanks Jack
 

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Old Truck Junkie
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If the bike is stock, the popping is normal. It is that the reed valves are allowing air into the exhaust and burning the unburned gases in the muffling system. It also helps to cool the valves a bit due to the lean running of the engine.
 
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