Unhooked vacuum advance and high speed miss went away


Information and questions on GL1100 Goldwings (1980-1983)
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twinn
Posts: 5
Joined: Tue Aug 29, 2017 8:00 pm
Location: Marshall MN
Motorcycle: 1980 gl1100
1983 gl1100 Aspencade

Unhooked vacuum advance and high speed miss went away

Post by twinn »



I'm not much of a mechanic, bike is 1980 GL1100 with a vetter fairing. Had the bike running pretty well with lots of seafoam, but still had the bad clatter when taking off and below 2000 rpm. Borrowed a sync outfit and synced the carbs, it went pretty well got them pretty close. Other than filling up with fuel and adding 2 ounces of 2 stroke oil nothing else but I went to ride it and had a terrible high speed miss at part throttle, like when trying to hold 60 mph. Acceleration was great, lots of power, but couldn't hold a steady speed without lots of surging and backfiring on the right side. Somehow I thought to un hook the vacuum advance and ride it, it is much better, almost normal, good power and smooth. What could this be telling me, I am at a loss, thanks in advance, Twinn. PS, never did get rid of the terrible clatter on take off in low gear.


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jeffcosmo
Posts: 228
Joined: Thu Aug 22, 2013 9:26 pm
Location: Burlington, WI (Honey Lake)
Motorcycle: 1983 GL1100 Aspencade
1983 GL1100 Aspencade
1983 GL1100 Aspencade (parts bike)

Re: Unhooked vacuum advance and high speed miss went away

Post by jeffcosmo »

It mean the vacuum advance diaphram is leaking.
bikrbob1
Posts: 14
Joined: Mon Jul 17, 2017 8:27 pm
Location: Aynor sc
Motorcycle: 2001 GL1800
1982 GL1100 Interstate

Re: Unhooked vacuum advance and high speed miss went away

Post by bikrbob1 »

Mine had similar symptoms, first I replaced the plug wires with some high grade silicon wires which really help. your plug wires are probably the original ones. Second I replace my coils with the 1500 coils and regapped the plugs to .035 from .031.
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