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a backfire is caused by incorrect timing or not enough back pressure in the exhaust pipe
Try the link below for an answer. It is for a different bike, but it is a possible solution. http://faq.f650.com/FAQs/BackfiringFAQ.htm
A motorcycle jerk or backfire can come from the choke not shutting off completely, the fuel jets might be clogged, a gasket or seal may be broken. Valves that are out of adjustment could also be the problem.
to much fuel is going to the engine for it to burn it all
A XR100 will do around 55 mph with stock gearing.
The gears in an automobile are the part that allows it to speed up and slow down. If you're gearing down, you're figuratively dropping into a lower gear to slow down.
a pulley gearing is the top of a pillar drill and it helps to pull down the chuck.
probably a bad spark, itll cause your engine to misfire flooding petrol in without igniting it, when it sparks afterwards it ignites causing a bang and backfire.
intake exhaust cams valve timing stroker kit lower gearing sort of a general question....
Slowing down
Gearing down works by changing the gear ratio on the transmission, transfer case, or differential. It increases the RPM of the input while reducing the output RPM to increase power.
makes it go slower