Question about 1976 Honda GL 1000 (K1)

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Missing, back firing just working really bad!

I have a 1976 goldwing with some major problems.when it is cold it will run on all 4 cyls,as it warms up it starts to break down big time.it has over 100000 miles yes miles on it.it has good compression in all 4,carbs have been cleaned,plugs have been replaced,has a nice blue spark,valves have been checked .004 on all,it back fires,misses,sometimes it works good.but not for long.please help me get riding this bike without worrying about getting back home.

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  • Beanie Barkhouse May 22, 2009

    resetting the exhaust valves made a big change in the way it works.it don't blow frames out the exhaust but it still back fires and pops out the exhaust and the intake.

  • Beanie Barkhouse May 22, 2009

    when it's at an idle.it is also slow to return to an idle.

  • Beanie Barkhouse May 22, 2009

    i have a vacuum guage to syncronize the carbs.I am a auto tech trouble shooter and this thing is driving me crazy.I know i'm missing something simple but what?it seems that they take turns poping and back firing.i have reset ign timing and checked cam timing.

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Im not certain as i dont have a maintanance manual for that bike, but intake valve clearance should be approx .004 and exhaust valves should be appxox .008 also you may consider taking the coils to a shop and have them tested. coils after warming up will begin to fail once they start to go bad. spark will be great when the bike is cold, but once it warms up, spark begins to fade and hit and miss.. this may be the problem. hope this helps.

Posted on May 21, 2009

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  • tbrat44 May 22, 2009

    does it pop and backfire while you rev it up, or is it doing that when you let off the throttle?

  • tbrat44 May 22, 2009

    Is it the same cylinder that keeps poping and back firing or is it all of them? do you have the tools to properly syncronize the carbs?

  • tbrat44 May 22, 2009

    did you have the coils tested? checking and adjusting fuel air mix. if all that is good, im at a loss. maybe an intake leak and or exhaust leak. or worst case, burnt valves. im sorry, but thats all i have. please let me know what you find.

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