Question about 1986 Honda GL 1200 Aspencade Gold Wing

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I have an 86 Honda interstate with 1200 engine which I just replaced with an engine that has only 5500 miles on it. I completely cleaned the carbs as it has been sitting for 15 years. Compression is good, valves have been cleaned and timing checked , but on cold start, as I raise RPM to 1500 t0 2000 RPM during warmup, #3 cyclinder misfires and the backfire comes back through the carb. It appears to me that this problem was already there before the bike went out of service. Any ideas?

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  • wbraun Jul 26, 2009

    Thank you to drallim for the tip. I had already taken the heads off and found the valves were sticky. I cleaned them up but with no success. I finally removed #3 carb and found the slow speed jet to be partially plugged in spite of just being cleaned. Reset the carbs and now works fine! Thank you again.

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Might be a bad intake valve spring or sticking valve on #3 cylinder. Not likely to be ignition timing problem as it would affect all cylinders. You might try an oil additive that is designed to free up rings and valves, but if it doesn't help, time to go inside the head. Good luck!

Posted on Jul 23, 2009

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