Question about 1985 Honda GL 1200 Interstate Gold Wing

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Hello! Am having an odd issue with a 1985 GL1200. Bike sat for 5 years before I got it. I rebuilt another set of carbs (same type) and put on it. Throttle return is fine, but the engine revs don't decrease at same rate as throttle is decreased - takes 2 to 4 seconds longer for engine to return to idle that in my other GL1200's. Am thinking that, either the reed valves are gummed up (didn't clean them, BAD ME!) or the secondary air system is not working properly for some reason. I replaced the air valve with new. Catch me at please!

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  • James Barnes
    James Barnes Oct 08, 2009

    Carbs are same as original in every way, just not the original set to the bike. Throttles are free and not hanging - they snap closed as they should.
    Issue is definitely in the secondary air system - either reed valves not working properly or secondary air valve not working properly.
    I did nothing with the reed valves during the carb overhaul - maybe I should have cleaned/inspected them. The secondary air valve was replaced during the overhaul and all was cleaned and looked normal.
    It does run better and better with each time I fire it off, even the delayed return to idle improves, but is still a bit troublesome.
    Am hoping someone has experienced this and has a fix or a direction in which to look.
    Will check for leanout but seems a bit on the fat side, if anything, to me... - thanks mikeb103!

  • James Barnes
    James Barnes Oct 14, 2009

    I found the issue - it turned out to be a matter of the idle enrichment screws being set at the factory setting - this bike is old, has alot of miles, gasoline has changed over the years, plus the baffles had been taken out of the exhaust pipes.
    Set the idle mix screws a full turn and a half richer, she sounds and runs like a sewing machine.

    Thanks for the trys, guys!!!!!!!!!!

  • mikeb103 May 11, 2010

    Are all of the jets in the new carbs the same size as the carbs you removed? Usually a hanging throttle is a sign of a lean fuel mixture



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Go into the carbs again and clean them real good. Take every parts off and clean-clean-clean. Also make sure the the intake boots are tight between the carbs and the boot. If there is a air leak it will stay at a higher RPM for a few seconds and return to normal. To test this take some carb cleaner and spray around the boot where it attached to the engine and where the carbs are clamped. Start the engine and if spay. If it changes rpm's up or down then you have a air leak.

Posted on Oct 14, 2009


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