Question about 2005 Honda CRF 450 R
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
Posted on Feb 19, 2009
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.
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Posted on Dec 25, 2008
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