Question about 2003 Honda CRF 230 F

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Engine back fires

I have a 2005 CRF that I bought used that had been siting in garage idle for quite some time. Long story short now that I have cleaned it up, drained all the old gas, cleaned the air filter, cleaned out the carborator with an air hose and put it all back together the engine back fires when I let off the throttle. The bike runs good when shifting up through the gears and I am throttling the gas, but as soon as I let off the engine pops with a back fire.

Is this something I can fix myself or should I take it to the dealer.

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  • sherman north Jun 30, 2015

    it might be out of time but you might want to run a few tanks of gas out of it, it might help clean some dirt out of it or build up, be worth a try.



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It may still have some water in the tank/system or the spark plug is no good.With a full tank of fuel,add 200ml of methilated spirits.It breaks up any moisture and lets it burn away.Also,with the motor out of gear,run the bike at higher revs and close the choke fully on and give full throttle at the same time.When the motor starts to die,flick the choke off.This can sometimes unclog a carby jet that may be slightly blocked because with the air choked,it gives a sudden **** off fuel.This may/maynot fix the bike but it the 1st thing to try before paying a dealer and it can't hurt anything.Hope this helps you

Posted on May 29, 2010


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Hi and welcome to FixYa,

Initially, backfiring is a spark/timing issue or contaminated fuel (water) or as you stated stale fuel. AVGas would not result to backfiring but rather a stronger pull though would heat up easily.

Good luck and Thank you for using FixYa. Happy Holidays.

Pls be informed that due to my current rank and rating, even a Helpful would be detrimental to my status. Should this solution not address your concern, it would be appreciated if you could just not rate it at all. Cheers.

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