Question about 2002 Honda CRF 450 R

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2002 crf450, rough running, back firing, hard start

Hard start, back firing, sudden onset problem, valves? coil? replaced sparkplug but same.

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  • wsg29 Feb 20, 2009

    difficult to kick start, back firing, dificult to start when hot

  • Anonymous Mar 15, 2014

    it run good until gets hot then it starts to cut out like starving for fuel it back fires shut down but it will start up again run for a while and cut of again

  • Tony Young
    Tony Young Jun 14, 2015

    Rough idel?

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Would that cause a rough idal?

Posted on Jun 14, 2015

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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.

Posted on Dec 27, 2008

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hello
Back fire is an indication that the bike is firing incorrectly.
Your timing chain is probably stretched, due to the year.
inproper valve timing due to stretched timing chain will make the bike backfire.

I have other thoughts like stuck valves or inproper sparkplug wires on wrong plug,
i always start with easier and less expensive method.
1st check your sparkplug wires to make sure they are on the right plug.
2nd pull sparkplugs and do compression and leakdown test.
3rd pull componets to see if valves are opening and closing, (valve clearance check)
4th if valves are good, then timing chain is probably stretched.
5th if timing chain and timing marks are good, and valves are good, then proceed to
testing the signal generator to make sure your getting a signal to the cdi,
6th if you have a signal to cdi, the cdi tells which coil to fire. either # 1&4 or # 2&3.
if signal generator is working, but coils aren't firing right then its the cdi.
obviously your coils work because its firing, just back firing.

Thats all it could be from easiest to hardest.
Good luck and have a great weekend.
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