ignition timing


Information and questions on GL1000 Goldwings (1975-1979)
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WavyDavey
Posts: 4
Joined: Sat Aug 29, 2009 5:40 pm
Location: Ontario
Motorcycle: 1979 GL 1000

ignition timing

Postby WavyDavey » Wed Oct 21, 2009 6:48 pm



How do I set the timing on a 79 Goldwing with electronic ignition.I bought the bike about amonth ago and it seems to run good but backfires when you slow down .I thought it could be timing.
Thanks for any help
Wavy Davey



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78AzWing
Posts: 126
Joined: Sun Oct 04, 2009 4:50 pm
Location: San Tan Valley, Arizona
Motorcycle: 1978 GL1000 UnDressed and Progressively Weber Carbureted

Re: ignition timing

Postby 78AzWing » Fri Oct 23, 2009 3:21 am

Could be a leak in the exhaust, or a leak in the intake system, or your carbs need to be adjusted. Maybe cleaned.
On the 1100 there are four air cutoff valves, one on each carb. They can go bad and cause your symptom.
Meddle not in the affairs of Dragons
For thee are Krunchie and taste goode with Ketchup!

WavyDavey
Posts: 4
Joined: Sat Aug 29, 2009 5:40 pm
Location: Ontario
Motorcycle: 1979 GL 1000

Re: ignition timing

Postby WavyDavey » Fri Oct 23, 2009 3:48 pm

thanks for the help I'll check it out.
Wavy davey

Old Fogey
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Location: Glasgow Scotland
Motorcycle: 1976 GL1000
1979 GL1000
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Re: ignition timing

Postby Old Fogey » Fri Oct 30, 2009 2:24 am

The 79 is a 1000. There is an air cut -off valve on the top of the intake plenum (Follow the rubber line from the bottom of the #1 carb bowl). The diaphram can split causing the backfiring. Rebuild kits are readily available and take minutes to fit.
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'Impossible' is just a level of difficulty! The only stupid question is the one you didn't ask first!

User avatar
78AzWing
Posts: 126
Joined: Sun Oct 04, 2009 4:50 pm
Location: San Tan Valley, Arizona
Motorcycle: 1978 GL1000 UnDressed and Progressively Weber Carbureted

Re: ignition timing

Postby 78AzWing » Fri Oct 30, 2009 2:36 am

My apologies.
I read 'electronic ignition' and immediately jumped to the 1100.
Duh!! :oops: :mrgreen:
Meddle not in the affairs of Dragons
For thee are Krunchie and taste goode with Ketchup!

WavyDavey
Posts: 4
Joined: Sat Aug 29, 2009 5:40 pm
Location: Ontario
Motorcycle: 1979 GL 1000

Re: ignition timing

Postby WavyDavey » Sat Oct 31, 2009 7:52 am

Thanks again for the update.I have an overhaul kit on order for the air cut off
valve .It seems to have the right symtoms and it will be one thing off my check it out list.I am trying to get some riding in before winter so I can get an idea of what I need to do to put it in top shape over the winter.No problem about the1100 the symptoms are the same and I knew the 79 only had one valve after I checked the book,but it got me on the right track.

Cheers for now
Wavy Davey

WavyDavey
Posts: 4
Joined: Sat Aug 29, 2009 5:40 pm
Location: Ontario
Motorcycle: 1979 GL 1000

Re: ignition timing

Postby WavyDavey » Sat Nov 07, 2009 7:40 pm

I cleaned the air cut off valve and installed a kit in it, and presto no more backfiring.
Thanks again for the advice
Cheers Wavy Davey




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