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114 Posts
I had this problem last year when I replaced the mufflers, it started to backfire on the right side only. The simple fix was just a spark plug replacement.
This time around I was working on the bike and it was out of commission for about 2 weeks, replaced the front tire, did a rebuild on front brakes, and changed the oil.
Most of the backfiring is during deceleration but it also does it slightly while idling in neutral. I did check the exhaust manifold and the muffler on that side and it seems to be just fine. One thing that I didn't rebuild is the air cutoff valve. Could that cause it to backfire only on the right?
BTW, I did replace the spark plugs on that side again, just in case. Last time I had this problem I triple checked the timing belt and the valve clearance so I know that is ok.
Update: I rode the bike today on the freeway, came back and took the plugs out and both sides were running lean. I need to pull the carbs out anyway to replace the plenum gaskets and I'll do detail inspection and a clean up but I was thinking about another thing that might cause the problem, K&N air filter with a combination of short almost open exhaust pipes?
This time around I was working on the bike and it was out of commission for about 2 weeks, replaced the front tire, did a rebuild on front brakes, and changed the oil.
Most of the backfiring is during deceleration but it also does it slightly while idling in neutral. I did check the exhaust manifold and the muffler on that side and it seems to be just fine. One thing that I didn't rebuild is the air cutoff valve. Could that cause it to backfire only on the right?
BTW, I did replace the spark plugs on that side again, just in case. Last time I had this problem I triple checked the timing belt and the valve clearance so I know that is ok.
Update: I rode the bike today on the freeway, came back and took the plugs out and both sides were running lean. I need to pull the carbs out anyway to replace the plenum gaskets and I'll do detail inspection and a clean up but I was thinking about another thing that might cause the problem, K&N air filter with a combination of short almost open exhaust pipes?