2007 Yamaha Royal Star Tour Deluxe "causes motor backfire" Questions

...motor was probably revved up and over into the red line and treated like hell bent for leather. A hard backfire can cause a connecting rod to be bent. The engine was most probably also very hot when ...

What causes the motor to backfire thru the exhaust? When I adjust the timing the carborator backfires? Backfire through carb is timing too far advanced. Backfire through exhaust is timing too retarded

...motor has two carbs then balance the carbs. Balancing the carbs basically means being certain the slides on both carbs open up simultaneously. If one carb opens sooner than the other then it 'drives' ...

...causes the intake valve to still be closing when combustion occurs - and a second explosion occurs in the manifold - which you hear as a back-fire.  2 oz Mega Power Gas Treatment #93 in the fuel ...

...motor. check your exhaust connections and make sure they are tight and you'll notice the backfire disappear. I've saw this several times and my bike does it as well when the bolts vibrate ...

...motor backfires from the carb several things can be at fault.  A part throttle backfire can be caused by a lean condition.  Too much air and not enough gas.  The carb could be jetted ...

...motor pulls higher rpms on downshift. This will cause a lean backfire. I know it has been several months since you posted this and you may have this corrected already, but I just stumbled upon your ...

backfire when letting off . also has a two brothers pipe . ?? does the motor have a rev limiter or governor on it..?? Not at 3500 rpm's and would definitely not cause a backfire. Take it to a shop, it

...motor to be 1986 GSX750. it runs, carby has fuel in it and seems to be working alrighty, plugs are sparking, but engine backfires a fair bit which makes me think firing order is not right..... any ...