High speed running problem

Information and questions on GL1500 Goldwings (1988-2000)
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Joined: Tue Jan 03, 2017 8:10 am
Location: Hagersville Ontario Canada
Motorcycle: 1988 GL1500

High speed running problem

Post by GD8826 » Thu Dec 07, 2017 3:37 pm

My 1990 GL1500 SE has developed a problem at high speeds, this problem only occurs after I have been on the highway doing around 70 or 75 . After an hour or so I lose power and it makes the GL work to run 60 or so. If I pull over and shut the engine off and wait 5 or 10 minutes I am good to go for another hour or so. Driving around town or on secondary roads I do not have an issue. I have taken it to my Honda shop but these young mechanics only go by the book , so if the bike is not showing these symptoms then they do not know what the problem is, and driving more than 70 mph around town could result in a problem with Five O. I have around 68K on the bike, I just purchased the bike last winter because it had a California sidecar on it so my wife can take her dogs when we go for family outings. Since the bike had sat for 3 years prior to me buying it , before we started riding this summer I took it into the shop and had them change all the fluids, timing belts, and go over it. I have 2 other Gold Wings and all they ever need is gas and a couple of oil changes a year. Having a problem is something I am not use to. I changed the gas cap because that was suggested as a possible problem, someone suggested the fuel pump was not working properly , that I have not had tested. Any suggestions

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83 GL1100 standard
84 GL 1200 I

Re: High speed running problem

Post by virgilmobile » Thu Dec 07, 2017 4:57 pm

Probably the easiest test is to leave the lid open.Run it till it starts to dog off.While struggling with it,reach into the lid and crack open the gas cap.Should it be plugged,a vacuum can develope in the tank making it hard to keep up with the fuel demand.
A second problem area is with the vacuum fuel shutoff valve.Its just in front of the gas cap and it's vacuum line may be hardned and leaking.Its attached to the right intake runner.

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Re: High speed running problem

Post by thrasherg » Thu Dec 07, 2017 7:11 pm

As suggested it sounds like your gas tank is not venting correctly, I would try riding it until the problem appears and then open the gas filler cap and see if it suddenly starts running correctly. If it does you need to find why the tank is not venting correctly. If opening the tank doesn’t fix the issue, then it might be a blocked fuel filter. From your description it really sounds like a fuel starvation issue.


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Re: High speed running problem

Post by WingAdmin » Thu Dec 07, 2017 9:11 pm

A suggestion to eliminate the gas cap as a potential cause: Tie a cloth, piece of thick rope, etc. around the gas cap vent line, and drape it out the gas flap. This will keep the flap from closing and latching shut. Then go ride.

When the engine starts to falter, reach down, flip open the gas flap, and twist the gas cap off. You don't have to remove it, just twist it loose, to allow air into the tank. If the bike suddenly comes back to life, then you have found your culprit. If it has no effect, then the gas cap is not your problem.

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Re: High speed running problem

Post by newday777 » Sat Dec 09, 2017 6:44 am

Have you changed the fuel filter?
Checked the air filter (critters love to store stuff in them)
Have you tested the fuel pump output flow, or pulled it out of the tank to check for rust/crud in the tank? Fuel pumps have been a weak point on the older 1500s.

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