Engine Sputters Approaching Higher RPMs -Occasional backfire

blair_lacour · Post by **blair_lacour** » Thu Nov 11, 2004 12:01 pm

This just started yesterday for the first time. When the spree starts to pick up speed / begins to accelerate a bit quicker (around 15 - 20 mph), the engine sputters, give a bit with an occasional backfire. When I slow down or come to a stop, the engine idles as normal.

Early in the summer, I took the bike out of a decade long dry-dock. I drained / replaced the fluids, got a new battery / sparkplug and cleaned the carb twice and has been running awesome ... everything has been ok.

I am guessing that there is too much / too little air or too much / too little gas ... that I need to tinker with. Doesn't a backfire indicate too much gas? Please let me know what the symptoms indicate and what I can do to fix them.

Thanks in advance
Blair

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Jerry · Post by **Jerry** » Thu Nov 11, 2004 1:33 pm

Sputters and misses at higher speeds is definitely an indication of too much gas. I've found that when this happens, the most likely culprit is a piece of dirt in the choke jet. The needle on the choke is trying to expand downward and cut off the rich mixture, but foreign material is not allowing a complete cutoff.
Pull the carb, clean as per instructions and pay careful attention to the choke jet. Pull the choke assembly and clean thoroughly. It will clear up the problem, I'm just about positive.