78 GL1000 backfire on left side and charge problem


Information and questions on GL1000 Goldwings (1975-1979)
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deerhunter80
Posts: 41
Joined: Sun Jan 17, 2010 7:37 pm
Location: owensboro ky
Motorcycle: 1978 Honda Goldwing GL1000
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78 GL1000 backfire on left side and charge problem

Postby deerhunter80 » Sun Jan 17, 2010 8:30 pm



my 1978 Goldwing GL1000 is backfiring on the left side when i try to start it. when it does fire it idles low and dies. when it does manage to idle between 1000-2000 RPM my charge goes from 12V to 10-8V. my stator looks new and wondering what the problem could be. if any1 out there has any answers im on a very tight budget and only have $800 to fix this bike with, please help.



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

Re: 78 GL1000 backfire on left side and charge problem

Postby WingAdmin » Mon Jan 18, 2010 11:03 am

When the Wings idle, because it uses a stator instead of an alternator, it does not put out enough power to run the engine and charge the battery. So at idle (and particularly if it is a low idle), your bike is actually running off the battery - and if you are sitting in a traffic jam for a long time, it's a good idea to shut your bike off for this very reason. This is why the charge will drop at idle.

So you need to focus on the reason for the backfires. The first (simplest, and cheapest) thing I'd look at is the condition of the spark plugs. You might also want to check your fuel filter, that's a cheap fix as well.

If those check out, you need to start looking at the carb and valves for the cylinder involved. Valves can be checked with a compression tester.

deerhunter80
Posts: 41
Joined: Sun Jan 17, 2010 7:37 pm
Location: owensboro ky
Motorcycle: 1978 Honda Goldwing GL1000
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Re: 78 GL1000 backfire on left side and charge problem

Postby deerhunter80 » Wed Jan 20, 2010 2:30 pm

what should the compression be at?

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WingAdmin
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Posts: 17047
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: 78 GL1000 backfire on left side and charge problem

Postby WingAdmin » Wed Jan 20, 2010 4:08 pm

From the GL1000 service manual on the "Manuals" page of this site, on page 3-11:

Normal compression pressure is 12 kg/cm2 (171 psi). Compression pressure above 14 kg/cm2 (199 psi) indicates that carbon deposits have accumulated in the combustion chamber or on the piston. Disassemble and decarbonize.

If the compression pressure is below 10 kg/cm2 (142 psi) or if there is a 1.0 kg/cm2 (15 psi) variation between cylinders, this indicates leakage at the valves, piston rings, or cylinder head gasket. Disassemble and repair.

TKM
Posts: 66
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Location: Brockville Ontario
Motorcycle: 1976-GL 1000-
1978 GL 1000-rolling frame
1979 GL 1000-
1982 GL 1100A-
1999 Valkyrie
1974 TR6

Re: 78 GL1000 backfire on left side and charge problem

Postby TKM » Fri Jan 29, 2010 8:43 am

Is this a bike that you have been riding or is it one that has been sitting for awhile. If it has been sitting , you may have rust in your tank which has travelled down to the carbs (it will travel through a fuel filter ) If this is the problem you have to start by cleaning the tank then the carbs You have to start with a clean system .Some poeple have had luck with seafoam in the gas , i never have

I would suggest you go to Randakks site and look under tech tips for carbs .
The charging , the gauges are slow to react , have you tried checking the output yourself with volt meter

deerhunter80
Posts: 41
Joined: Sun Jan 17, 2010 7:37 pm
Location: owensboro ky
Motorcycle: 1978 Honda Goldwing GL1000
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Re: 78 GL1000 backfire on left side and charge problem

Postby deerhunter80 » Fri Jan 29, 2010 3:11 pm

i got the bike to start and adjusted the carbs enough to keep it running. since i did this the backfire has left. i still need to sychronize the carbs and fix the charge problem. im taking it to a Goldwing specialist on monday. he said it might be in the plug off the voltage regulator. he said if thatis the problem he'll fix it free of charge.

TKM
Posts: 66
Joined: Mon Jul 27, 2009 5:57 pm
Location: Brockville Ontario
Motorcycle: 1976-GL 1000-
1978 GL 1000-rolling frame
1979 GL 1000-
1982 GL 1100A-
1999 Valkyrie
1974 TR6

Re: 78 GL1000 backfire on left side and charge problem

Postby TKM » Fri Jan 29, 2010 4:13 pm

good stuff on getting it running--it's good to hear about a happy ending
Terry

deerhunter80
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Joined: Sun Jan 17, 2010 7:37 pm
Location: owensboro ky
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Re: 78 GL1000 backfire on left side and charge problem

Postby deerhunter80 » Mon Feb 15, 2010 12:54 am

just got the bike painted and cant wait for the vintage Goldwing show sponsered by Randakks in Bellford VA.I painted it indigo blue wth metal flakes

TKM
Posts: 66
Joined: Mon Jul 27, 2009 5:57 pm
Location: Brockville Ontario
Motorcycle: 1976-GL 1000-
1978 GL 1000-rolling frame
1979 GL 1000-
1982 GL 1100A-
1999 Valkyrie
1974 TR6

Re: 78 GL1000 backfire on left side and charge problem

Postby TKM » Mon Feb 15, 2010 7:23 am

Great looking bike ! congratulations--

deerhunter80
Posts: 41
Joined: Sun Jan 17, 2010 7:37 pm
Location: owensboro ky
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Re: 78 GL1000 backfire on left side and charge problem

Postby deerhunter80 » Mon Feb 15, 2010 12:26 pm

thanks and if anyone has any suggestions for me on the restoration let me know. im always open to suggestions or criticism

deerhunter80
Posts: 41
Joined: Sun Jan 17, 2010 7:37 pm
Location: owensboro ky
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Re: 78 GL1000 backfire on left side and charge problem

Postby deerhunter80 » Tue Feb 16, 2010 12:49 pm

here is the before picture of the bike.




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