Running rough at high speed


Information and questions on GL1000 Goldwings (1975-1979)
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Mjholi67
Posts: 27
Joined: Sat Feb 21, 2015 2:30 am
Location: Ellensburg, WA
Motorcycle: 1979 gl1000 gold wing

Running rough at high speed

Postby Mjholi67 » Sun Mar 01, 2015 12:51 pm



I bought a 1979 Honda gold wing and looks ingrat condition. I have changed timing belt, oil, radiator fluid, oil for shaft drive.' She starts right up and has good accellaration through gears. I noticed on the freeway at 60-70 that when I try to accelerate it seems to run a little rough and accelates slowly at times smooths out and accelerates great but this isn't everytime. Suggestions?



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MikeB
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Location: Tacoma, WA
Motorcycle: 1998 - GL1500 Aspencade.
2003 - GL1800A

Re: Running rough at high speed

Postby MikeB » Sun Mar 01, 2015 12:55 pm

It doesn't look like you did anything to your fuel system . Could be fuel related. You could try running some fuel additive through your gas tank. Gumout, Techron, Marvel Mystery Oil, Seafoam all come to mind.
MikeB
Tacoma, WA, USA

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dingdong
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Motorcycle: 1976 gl1000
1993 gl1500
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Re: Running rough at high speed

Postby dingdong » Mon Mar 02, 2015 9:50 am

I would be searching for a vacuum leak and also the points can cause that problem if not set perfectly.
Tom

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WingAdmin
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Motorcycle: 2000 GL1500 SE
1982 GL1100A Aspencade (sold)
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Re: Running rough at high speed

Postby WingAdmin » Mon Mar 02, 2015 11:55 am

Could also be fuel related - a clogged fuel filter? High speed running uses a lot of fuel, and if you start demanding more than your fuel system can supply (i.e. clogged filter), it will bog down.

Under heavy load, it takes a lot more spark to ignite the air/fuel mixture, so you could be suffering from weak spark.

Is it losing power (bogging down) like you're running out of gas, or is it intermittent missing?

Mjholi67
Posts: 27
Joined: Sat Feb 21, 2015 2:30 am
Location: Ellensburg, WA
Motorcycle: 1979 gl1000 gold wing

Re: Running rough at high speed

Postby Mjholi67 » Tue Mar 03, 2015 10:48 am

Thank you,

Those are all great pieces of information. I will attack the fuel filter, and plugs this weekend and ask a friend about the vacuum. Would you also recommend syncing the carbs for good measure?

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WingAdmin
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Posts: 17046
Joined: Fri Oct 03, 2008 4:16 pm
Location: Strongsville, OH
Motorcycle: 2000 GL1500 SE
1982 GL1100A Aspencade (sold)
1989 PC800 (wife's!)
1998 XV250 Virago (sold)
2007 Aspen Sentry Trailer

Re: Running rough at high speed

Postby WingAdmin » Tue Mar 03, 2015 11:19 am

Mjholi67 wrote:Thank you,

Those are all great pieces of information. I will attack the fuel filter, and plugs this weekend and ask a friend about the vacuum. Would you also recommend syncing the carbs for good measure?


Syncing carbs won't hurt, but unsynchronized carbs normally exhibit their behavior at low power/idle, not at high power output. That said, carb sync should be done as the very last thing on your list, as virtually everything else will affect it.




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