'75 won't start after running for a minute


Information and questions on GL1000 Goldwings (1975-1979)
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ChuckSeders
Posts: 5
Joined: Wed Jul 14, 2021 9:25 pm
Location: United States
Motorcycle: 1975 GL1000

'75 won't start after running for a minute

Post by ChuckSeders »



Hi all - new here.

I've been slowly rehabbing my dad's old bike (1975 GL1000) which hasn't been started in at least five years.

So far: new timing belts, carburetor rebuild with Randakk's O-ring/gasket kit, valves adjusted, new fuel lines/fuel filter, Dyna electronic ignition installed, oil changed, new battery.

Just finished the electronic ignition today and it started and ran for a minute and a half (to my surprise - wish I could share the video) with some attending to the choke as it idled from around 1000 to 3000 a little sporadically. Since then I haven't been able to get it to fire. I rechecked the timing and 3/4 are spot on while 1/2 are a little early (which I can't get to delay any further due to the right-side module being turned to the max). Idle mix screws are set to 1 and 3/8ths from bottom.

What am I missing??
Thanks for any tips.


MattMcCoy
Posts: 65
Joined: Tue Aug 25, 2020 5:31 pm
Location: Fort Worth, TX, United States
Motorcycle: 1983 GL1100A Aspencade

Re: '75 won't start after running for a minute

Post by MattMcCoy »

I would check to see if there’s spark at the plugs, inspect fuses, and then try to get it to fire with starting fluid if those check out. Could help point to either electrical or fuel issues for troubleshooting.
ChuckSeders
Posts: 5
Joined: Wed Jul 14, 2021 9:25 pm
Location: United States
Motorcycle: 1975 GL1000

Re: '75 won't start after running for a minute

Post by ChuckSeders »

Thanks Matt - I should have written that all plugs have a good spark and it will run on starting fluid. I'll take a look to see if any fuses look bad though. I think I'm dealing with fuel issues, just hate to think I may have to pull the carbs again.
MattMcCoy
Posts: 65
Joined: Tue Aug 25, 2020 5:31 pm
Location: Fort Worth, TX, United States
Motorcycle: 1983 GL1100A Aspencade

Re: '75 won't start after running for a minute

Post by MattMcCoy »

No worries. If it runs on starting fluid, it’s likely a fuel issue to chase down. Have you checked the fuel pump yet?
ChuckSeders
Posts: 5
Joined: Wed Jul 14, 2021 9:25 pm
Location: United States
Motorcycle: 1975 GL1000

Re: '75 won't start after running for a minute

Post by ChuckSeders »

The fuel pump was my next target. Haven't opened it up yet as I haven't found much on what to expect or possible problems. I do see that each float bowl has fuel when I open the drain plugs. Maybe that's just gravity and the pump is still bad?
MattMcCoy
Posts: 65
Joined: Tue Aug 25, 2020 5:31 pm
Location: Fort Worth, TX, United States
Motorcycle: 1983 GL1100A Aspencade

Re: '75 won't start after running for a minute

Post by MattMcCoy »

ChuckSeders
Posts: 5
Joined: Wed Jul 14, 2021 9:25 pm
Location: United States
Motorcycle: 1975 GL1000

Re: '75 won't start after running for a minute

Post by ChuckSeders »

Well I attached a tube to the pump output today and after turning the petcock back on I had a good amount of (really rusty) gas start draining by gravity. I figured right away that this has been pushed into the carbs which I'll have to remove and clean again, but I turned it over a couple times to see if it would pump. It did, but still full of rust. I opened it up and I'd say she's due for replacement.
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'75 fuel pump
'75 fuel pump

ChuckSeders
Posts: 5
Joined: Wed Jul 14, 2021 9:25 pm
Location: United States
Motorcycle: 1975 GL1000

Re: '75 won't start after running for a minute

Post by ChuckSeders »

To close the loop, I ordered and installed a new fuel pump after taking the carbs back off and cleaning them again. Luckily the internal screens caught the crap that was pumped in and they didn't need a complete breakdown.

Ran it for the first time in 5 years tonight. Runs like a dream.

Thanks for the pointers!
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