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Try setting the valve lash t may stop the backfire but if the smoke ccontinuesyou may have a stuck or broken ring if it is stuck you can buy something to free it go to the local Advance store and they will help.
The timing is not adjustable. I would start with a clean air filter, clean carb, good spark plug, check and make sure that your cam timing matches your flywheel.
Hi, Did you tried replacing the CDi for your bike? Tell me what happen when you replace or borrow a CDi from your friend, just to check if it is the real culprit......
hope this information helps these are Denso Plugs
YAMAHA YZ125
YEAR
2004-1999
ENGINE
125 cc
APPLICATION INFORMATION
STANDARD STK#
4049
STANDARD PLUG#
W27ESR-V
IRIDIUM POWER STK#
5317
IRIDIUM POWER PLUG#
IW27
IRIDIUM RACING STK#
5714
IRIDIUM RACING PLUG#
IW01-27
GAP
0.024
hi buddy yor burning too much fuel on carb there are 2 screws the mixture is the screw you need screw this in 1/2 of turns and try this also replace spark plug br8es and try this bud
if your engine is backfiring you probably jumped time reset your engine to top dead center valves closed on #1 cylinder check your timing: belt / chain / gears for wear
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