RPM Surge While In Third Gear

692 Views 3 Replies 3 Participants Last post by JimArmstrong1, Aug 6, 2009

N5HQ

Discussion Starter · Jul 31, 2009

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In an earlier post I wrote about a problem I’m having with my 1989 GL1500. I reported that I thought it was a vacuum line problem. I took it to a Honda dealer and they tore it down and could not find any vacuum problems. They were to do some research and call me to schedule an appointment to try again. I’m beginning to think that they really don’t want to work on my Goldwing because that just hasn’t happened. It is 20 years old and most dealers just don’t really want to work on that old a Goldwing.

Anyway, I pretty much know that my original suspicion was incorrect. I don’t think it is a vacuum line problem because the dealer inspected all the lines and stated that it was not the problem and because I have discovered another symptom.

I have discovered that if, sitting still or moving, I clutch the bike and shift into third gear the engine will increase speed from idle to about 2200 RPM. Shifting back to second allows the RPM’s to revert to idle speed. I can be standing beside the bike and holding in the clutch, shift through the gears and watch the engine speed go up and down depending on what gear I’m in and it is very repeatable. This doesn’t sound like a vacuum problem to me.

Does anyone have any idea what or where I should start looking? I’m sure it is electrical but I have no idea what could cause this problem. Apparently there is some type of gear detection circuitry. I will be studying the schematics this weekend but any clues to help would be greatly appreciated.

Thanks for all the support,

N5HQ

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· #2 · Jul 31, 2009

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I went through the same thing with mine.
I had to pull the carbs to see all the vacuum lines.
I changed numerous lines on mine.the honda place probably dont wana fool with it because its a old bike.
Might have to do it yourself.
Good luck
TOMMY

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zimmerleemark

· #3 · Jul 31, 2009

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maybe air jet solinoid:baffled:

mark:waving:

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JimArmstrong1

· #4 · Aug 6, 2009

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I have a 1995 Wing that had an engine surge as well. I took all the trim and plastic off to access the carbs but could not find anything. Vacuum lines were all good but i noticed one larger line that connects to the bottom of the air box right front corner while sitting on the bike that was off. I had to put a tie-wrap on it to stop it from slipping off the fitting. Solved the problem. Maybe something to look for. Good luck. Jim

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