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1988 1500 idle goes uo and down by 300 rpm any body got any ideals changed gas filter and air filter looking at sub filter ,
 

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hi don some of the guys here with the older 1500 found that if you turn the idle ajuster in the gas cap area up and down a few time it relived the prob for them
 

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1987 GL1200 Interstate
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Wasn't there a problem with the vacuum line in front of the filler cap getting crimped on the '88? My memory is sketchy...but...it had something to do with the idle.
 

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thanks guys this bike belongs to a friend i have it apart the metal line going around the air cleaner is missing a hose tried the idle adjust .no help yet sprayed cleaner in them seem to help a little changed gas filter it was bad will try to syc. the carbs next
 

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this 94 was doing same thing. found a vacuum line on left side[big one] where you sync carbs had gone bad in the curve. also under carbs, under rubber mat theres a smaller 1 with ell shape was bad also. replaced both and no-more up and down in idle.



mark:waving:
 

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thanks guys found two hoses one broke one not there seems to do better.will keep you informed .boy these 1500 are good bikes this is second one in two weeks with 100,000 miles on orginal cam belts.
 

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sounds like a job for SEAFOAM !!!!:clapper:
 

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My 88 GL1500 run ruff but with the choke on it run good. Put new plugs checked the timing belts and compression all good line up with all marks. This happen when I down shifted to first gear and cracked the throttle open, what i think was to far because afterward the bike started running bad. But again with the chock on it run good. Now what did I do??????????????. and anyone help me with this problem??????????????????
 

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Piaggio MP3, was 02 GL1800
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My 88 GL1500 run ruff but with the choke on it run good. Put new plugs checked the timing belts and compression all good line up with all marks. This happen when I down shifted to first gear and cracked the throttle open, what i think was to far because afterward the bike started running bad. But again with the chock on it run good. Now what did I do??????????????. and anyone help me with this problem??????????????????
all responses to this question are to be placed in your original thread, please try to keep it all in one place so that folks will know what you have received advice on. Adding onto the bottom of a very old thread (5 years now) does not draw anyone to your problem. Most folks will skip the thread because they have seen it already.

thank you

http://www.goldwingfacts.com/forums...-forum/565850-bike-idles-funny-88-gl1500.html
 
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