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Re: Hi there i have a kxf 250 2004 its hard to start and...
It could be valves , check all the valve clearances.
also try a new spark plug
and clean the carb
a faulty kill switch can sometimes cause backfire as well
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if u sre geting fire from the plug and u have gas i will say that its a good thing it dont start could led to fire and maybe alot of unnesry damge.but over all it should start hold to to the wild open it might be geting the wrong air to gas mix to run right .does it have alot of miles ,is the wires on right.if so then cheack ur time it may have jump or flat spot on cam .but if u have air gas and fire it has to start inless u r fireing on exs instead of intake.hope this helps u??
when the ignition parts like the coil and the transistors in the cdi unit gets warmed up they dont work as well as when there cool,,,so a problem thats not there when cold will be there when its hot,,,,if the stator has a small fault in it when cold when it gets hot it turns into a big fault! the best way to find this fault is by swoping one part at a time till you fine the faulty part,,,or put it into the bike shop and pay through the knows for the fix? have you a friend with the same type of bike you could swop the parts with??? it a big big help if you have! i would start with the coil then the cdi unit,,,there the most likley parts to play up when they get to hot they go faulty!
bad spark plug, tight valve clearances,short in key switch or kill button, blocked fuel filter (There is usually one inside the tank on the fuel tap pick up)
i had the same problem if a valve needs to be adjusted alot it usally means it keeps sinking farther into the head. the valve seat could be off or its just time for new valves. but if the valves are still good. do a compression test if its low then its time for rings and piston.
timing belt slipped,bebt the valves need a valve job. these are interference engines the piston and the valves can not be in the same place at the same time,pistons bend valves
Classic valve train issues. Sounds like the valves are tight. One thing that concerns me is the "sudden onset". Valves usually tighten over time. Make sure you also tighten the cam chain as well.
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