Question about 2005 Honda CRF 450 R

1 Answer

Bike keeps back fireing when first starting

I just got a crf 450r and every time i go to start the bike it always back fires for ages then it mite go or not is it stale gas or is av gas the bike shop ffilled it up when i got it what would be a good gas to run plz

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  • b_cfalcon Dec 25, 2008

    Awesome, cheers for that!!! It is very much appreciated. And thanks for getting back to me so quickly

  • Anonymous Mar 28, 2014

    back fires ran bike without led substude forgot to put in the gas did i burn my vales

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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.

Posted on Dec 25, 2008

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1 Answer

Please help me with my 2011 Yamaha yfz 450r won't start just turn's over and back fire's i saw something about the emergency brake sensor i don't see that cable on mine


The two things I would check are timing and Carburetor if it is back firing through the carb it mostly likely is flooding, it it is backfiring through the exhaust it could be timing.this is thumb of rule most engines. Good Luck

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I have a Yamaha yfz 450r it don't wanna start up it turn's over and just back fire's


Hi nice ATV, Usually a single cylinder motor that back fires is either the timing Or a dirty spark plug. Check out this youtube video, This guy shows the right colour spark and I didn't know this but it should spark over the top of the centre electrode, Hope the is helpful.. CHEERS...
https://www.youtube.com/watch?v=mUOmsGiirTU

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It back fires when i let off the gas and will run for about ten mins then just quite and it will start i thought it mite be that i have bad gas or the spark plug faled or my valves need adjusted do you now...


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1 Answer

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Over time, gas will cause a varnish buildup in your carb if it sits too long. You can try adding some carb cleaner to fresh gas, but the results will not be immediate. You may have to have the carb rebuilt.

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1 Answer

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sounds more like a slipped timing chain to me, big problem area on the big power 4-strokes, tokyo mods makes a manual timing adjuster, will make a big difference in longevity of your next timing chain, i wound also check the vaves to make sure the piston hasn't shaken hands with the valves

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