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Backfiring is caused by a build up of un-burnt fuel in the exhaust which is then ignited by the hot gases causing an explosion. Excess fuel could be caused by a number of factors, 1. timing is out. 2. plugs not firing correctly. 3. carb or fuel injection settings are wrong. Generally back firing is caused by un-burnt fuel so you need to find out why this is happening.
Hope that helps
Check the oil level with the bike level, on the center stand, either before you start the engine in the morning or after it's had at least 5-10 minutes for oil to trickle down after you turn off the motor.
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What is the difference in the sound when it engages and when
it does not?
What does engage mean to you.
To me it means a loud click sound followed by the engine cranking.
Actually engage is just the click sound.
Cranking is the small electric starting motor forcing the engine to move as if
it were actually running. Once it moves just a bit a spark plugs fire and the
resulting explosions makes the engine keep going until one of the following
happens. Loss of air/fuel mixture (i.e. run out
of gas or air intake blocked) Loss of spark (i.e. battery low or dead,
bad coil, bad plugs) The two above do not come together at
correct time (timing) Something physically stops the engine
from continuing to operate (engine seizes, too much load)
If battery is low starter will not engage or crank.
If electrical connections are bad (usually loose or dirty)
current will not flow properly and starter will not engage or crank.
Both can be checked with a multi meter.
Measure battery voltage when attempting to start.
It should be 12-13.2 volts and should not drop below around 10
If it is not dropping but still not engaging/cranking,
continue to take voltage readings move from battery toward the starter. When
you find a sudden voltage drop, investigate wiring just before that point
upstream toward the battery.
Sounds like a float is sticking and continues to drip fuel into the cylinders while its parked...
Probably going to have to pull the carbs and clean them, also..when they stick like that and fill the cylinders up with fuel, it will seep past the rings into the crank case, so after you clean the carbs and set the float height, you'll probably want to change the oil as well... if the oil smells real strong of gasoline, id leave the drain plug out for a couple hours and let it air out before closing it back up and starting the back...an internal crank case explosion wouldn't be good at all!!!