'83 GL1100 engine issues


Information and questions on GL1100 Goldwings (1980-1983)
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dvcruz
Posts: 93
Joined: Sun Aug 15, 2010 1:49 am
Location: San Jose, Ca
Motorcycle: 1993 GL1500 Aspencade
1983 GL1100 Interstate

'83 GL1100 engine issues

Postby dvcruz » Thu Nov 04, 2010 5:57 pm



Howdy. Quick background - have a '83 that sat in a garage for 15 years (63K miles, well cared for). What grounded it was a rear brake problem, no engine problems that I know of. I replaced all fluids, regreased everything and rebuilt and sync'ed the carbs. I now have about two hundred miles on it.

The bike runs nice for about 30 miles then it seems to be needing fuel. I have new hoses and filters on it and the fuel pump quirts fuel across the driveway. But the bike just starts lugging after a while.

Numbers 2 and 4 cyl spark plugs are light brown and nice and clean. Numbers 1 and 3 are more like sooty black, although I cleaned them 100 miles ago. Going to set the pilot screws tomorrow.

When the bike is sitting on the center stand and at idle, I can see a tiny bit of smoke coming up from the area around cyl number 3. Smells like burning oil, but I'm not dripping oil anywhere and I can't see that it's leaking onto the exhaust pipes anywhere. But, something is smoking.

When I suck on the vac line for the pulse gen I move the weights, but I have to blow back into the vac line to hear them snap back into place. Shouldn't they move back on their own? I haven't popped the cover to look at them, only using my ears at this point. Can the cover be removed easily so that I can clean the gen if need be?

Your thoughts?


Back in the San Diego area!

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virgilmobile
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Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
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83 GL1100 I
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84 GL 1200 I

Re: '83 GL1100 engine issues

Postby virgilmobile » Thu Nov 04, 2010 8:18 pm

First thing,yes the vacuum advance should pull back on it's own.I cleaned and lubed mine when I had the engine out.I think it can be gotten to by the back end.Second,compression test cold then hot.look for large variations in compression(eg135 cold then 95 hot is not good).5lb difference between cyl.is good.My set up wing had 85lb on one and 135lb on another(not good).My rings were stuck(set up in louisiana for 4 years).Sounds like the same problem.I soaked each half of the heads(bike on side)for 2 days with MMO,drove it like I stole it and it did improve.

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WingAdmin
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Location: Strongsville, OH
Motorcycle: 2000 GL1500 SE
1982 GL1100A Aspencade (sold)
1989 PC800 (wife's!)
1998 XV250 Virago (sold)
2007 Aspen Sentry Trailer

Re: '83 GL1100 engine issues

Postby WingAdmin » Thu Nov 04, 2010 9:27 pm

Here's a quick test for you: when the bike starts lugging, try loosening the fuel cap. Sometimes the old fuel caps will have the vent valves fail in them, causing a vacuum in the tank after it's been run for a while. The fuel pump is fighting against the vacuum, and can't supply the engine. If that's the problem, you can get a replacement cap pretty cheap, or just drill a tiny hole in the top of the one you have.

dvcruz
Posts: 93
Joined: Sun Aug 15, 2010 1:49 am
Location: San Jose, Ca
Motorcycle: 1993 GL1500 Aspencade
1983 GL1100 Interstate

Re: '83 GL1100 engine issues

Postby dvcruz » Thu Nov 04, 2010 10:30 pm

Thanks for the quick response and good suggestions. I think the gas cap mention is right on because I know that when I open the cap, I'm getting a whooshing sound out of it. Even though I cleaned it out once I must not have cleaned it out well enough (what a non-stud I've become). So, I'll take care of that little issue.
I'll follow thru on the compression tests too. I just happen to have my supply of MMO on hand (hey, back to stud status).
The vacumn check is definately failing then. I know the plate isn't returning on it's own. So, I'll check that out tomorrow too.
Thank you!
Back in the San Diego area!

83gl1100nb
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Motorcycle: 83honda GL1100 Aspencade
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82 Nighthawk

Re: '83 GL1100 engine issues

Postby 83gl1100nb » Tue May 17, 2011 1:09 am

WingAdmin wrote:Here's a quick test for you: when the bike starts lugging, try loosening the fuel cap. Sometimes the old fuel caps will have the vent valves fail in them, causing a vacuum in the tank after it's been run for a while. The fuel pump is fighting against the vacuum, and can't supply the engine. If that's the problem, you can get a replacement cap pretty cheap, or just drill a tiny hole in the top of the one you have.



that's good info. i noticed on my '83 that there seems to be a vacuum when i open the gas cap when it's been running. i thought that it was supposed to be that way. i will be looking at cleaning the cap. any recommendations for that? thank you.

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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: '83 GL1100 engine issues

Postby WingAdmin » Tue May 17, 2011 1:15 pm

Soaking it in a solvent overnight will generally help dissolve any varnish or deposits - just make sure it's not a solvent that will damage the rubber gasket in the cap.

I know someone here has done this before - they soaked it in Seafoam for 24 hours and it fixed it.




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