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Jamhow, I have the same problem with my 89 gl1500.Idles rough,and stumbles when taking off from a stop until about 2000rpm ,then it smooth's out and runs like a dream.I have rebuilt both carbs ,checked all of the hoses,sync'ed the carbs ,still the same.I was reading the manual and I'm thinking it might be the carb control unit.The carb control unit has a vacuum hose going to it from the right cylinder head .I removed the line from the unit and hooked a hand vacuum pump to the unit ,and at 0-7 " vacuum it runs great , but if you put more than 7 " vacuum on it the bike starts idling rough and stumbles again.Well my bike has around 16" vacuum at idle.Don't know how to check the unit itself.Any idea's?
Jamhow, I have the same problem with my 89 gl1500.Idles rough,and stumbles when taking off from a stop until about 2000rpm ,then it smooth's out and runs like a dream.I have rebuilt both carbs ,checked all of the hoses,sync'ed the carbs ,still the same.I was reading the manual and I'm thinking it might be the carb control unit.The carb control unit has a vacuum hose going to it from the right cylinder head .I removed the line from the unit and hooked a hand vacuum pump to the unit ,and at 0-7 " vacuum it runs great , but if you put more than 7 " vacuum on it the bike starts idling rough and stumbles again.Well my bike has around 16" vacuum at idle.Don't know how to check the unit itself.Any idea's?
