Hesitation in throttle & stalling after a few miles


Information and questions on GL1000 Goldwings (1975-1979)
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finalcut9
Posts: 10
Joined: Fri Dec 13, 2013 10:08 pm
Location: Portland, Maine
Motorcycle: 2012 GL1800
1975 GL1000
1972 CB350

Hesitation in throttle & stalling after a few miles

Post by finalcut9 » Tue Apr 11, 2017 6:44 pm



The bike is a 75 GL1000 with 77 carbs. The carbs were professionally rebuilt by Pistol Pete. The gas tank was cleaned. The petcock cleaned and rebuilt with new rubber. New fuel lines and clamps. New inline fuel filter. New choke cable. Clear gas came out of the fuel line after the pump. New Plugs.

I started the bike up a few evenings ago. It was 55F out. It sputtered a bit initially but eventually idled fine. I let it warm up about 5 minutes and then took it for a 10 minute ride. No problems. It ran great. Nice and smooth acceleration.

The next morning it was around 35F. I started it up and it took about 10 minutes to get warmed up. It idled fine. I started down the road. After about 3 miles it started to lose power slowly with little throttle response and then died. I pulled off to the side of the road and opened the gas cap to make sure I had gas. I did. I tried to start it again and eventually, after about 5 tries, it fired up. I decided to turn around and go home. I rode about 1 mile and it bogged down again. I wauted a few minutes and tried to start it. After many cranks it fired up. I then hit the throttle hard and made it home.

After searching online I figured it was a plugged gas cap vent. I removed the rubber gasket and soaked the gas cap overnight in sea foam. I then blew the passages clear with compressed air. I reinstalled the cap and started the bike. It was around 65F out. There was a lot of hesitation at low RPM's when I twisted the throttle in neutral. After about 5 minutes it ran a little smoother but the throttle response wasn't what it should be - still a little hesitation. I took it for a ride for about 2 miles. It started to lose power going up a hill at around 30 MPH. I turned into the driveway and it died. I opened the gas cap. After a minute or so I cranked it a few times and it started. I drove it into the garage.

The gas is probably over a year old. I am pretty sure I put Stabil in it but there is a chance that I didn't. I didn't drain the bowls when I put it away for the winter.

Any thoughts on what I should check?



finalcut9
Posts: 10
Joined: Fri Dec 13, 2013 10:08 pm
Location: Portland, Maine
Motorcycle: 2012 GL1800
1975 GL1000
1972 CB350

Re: Hesitation in throttle & stalling after a few miles

Post by finalcut9 » Tue Apr 11, 2017 7:00 pm

One more thing...the bike sat for many years. The oil in the case was very thick and dark. I drained the engine oil twice. There may still be sludge in the case. I plan to run it with 1/2 tranny fluid 1/2 oil and then drain and refill.

Other things done: New water pump. New hoses and clamps. Cleaned radiator and filled cooling system. New battery. Adjusted valves. Had timing set by a local mechanic last year. It ran good when he was done with it but I never took it out for more than a 1/2 mile until this year. The rides I describe in the first post are the only rides I've done.

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Maz
Posts: 442
Joined: Tue May 19, 2015 4:43 am
Location: Kent, UK
Motorcycle: 1975 GL1000K1
1976 CB500T
1979 CB750L
1990 Yamaha FJ1200
1993 Suzuki GS500E

Re: Hesitation in throttle & stalling after a few miles

Post by Maz » Wed Apr 12, 2017 2:13 am

I'm wondering if your fuel pump is shot. You may have just enough gas in the tank to gravity feed the carbs if the pump is not pumping, but as the level drops below the carb height, it will stop feeding through. Pull the feed from the pump to the carbs and feed it into a container. Spin the engine over on the starter (with kill switch off) to check that the pump is squirting strong regular spurts. I'm sure someone will chime in with details of how much fuel it should pump over a short period of cranking.

Maz
Nostalgia is not what it used to be!

finalcut9
Posts: 10
Joined: Fri Dec 13, 2013 10:08 pm
Location: Portland, Maine
Motorcycle: 2012 GL1800
1975 GL1000
1972 CB350

Re: Hesitation in throttle & stalling after a few miles

Post by finalcut9 » Wed Apr 12, 2017 5:23 pm

Thanks! I will try that. Any other advice on things to check would be appreciated.

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Maz
Posts: 442
Joined: Tue May 19, 2015 4:43 am
Location: Kent, UK
Motorcycle: 1975 GL1000K1
1976 CB500T
1979 CB750L
1990 Yamaha FJ1200
1993 Suzuki GS500E

Re: Hesitation in throttle & stalling after a few miles

Post by Maz » Sat Apr 15, 2017 4:23 am

finalcut9 wrote:Thanks! I will try that. Any other advice on things to check would be appreciated.
It's not clear from your post when the carbs were rebuilt by Pistol Pete and how long the bike has sat since. It's possible there may be some residue from the old fuel causing problems and, if you're not sure that you treated the fuel, it may be advisable to drain it off and fill up with fresh. This definitely sounds like fuel starvation. Maybe run the bike til it starts acting up then immediately switch the engine and fuel tap off. Drain each float bowl to check how much fuel is in each. My guess is that a few (or all 4) Will not contain much at all.
Maz
Nostalgia is not what it used to be!

finalcut9
Posts: 10
Joined: Fri Dec 13, 2013 10:08 pm
Location: Portland, Maine
Motorcycle: 2012 GL1800
1975 GL1000
1972 CB350

Re: Hesitation in throttle & stalling after a few miles

Post by finalcut9 » Wed Jun 14, 2017 11:16 am

My gas cap was not working properly. It's designed to allow air in when gas is used. If air doesn't get in, the vacuum created prevents fuel from flowing. I read somewhere that people actually drill a hole in the cap. That didn't seem like the proper fix to me. I soaked it in Evaporust for a few days and then blew the passages clean with compressed air. That seems to restored the proper function of the gas cap and corrected the problem! I hope this helps others that may have the same problem.

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WingAdmin
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Location: Strongsville, OH
Motorcycle: 2000 GL1500 SE
1982 GL1100A Aspencade (sold)
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1998 XV250 Virago (sold)
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Re: Hesitation in throttle & stalling after a few miles

Post by WingAdmin » Sun Jun 25, 2017 10:15 pm

finalcut9 wrote:
Wed Jun 14, 2017 11:16 am
My gas cap was not working properly. It's designed to allow air in when gas is used. If air doesn't get in, the vacuum created prevents fuel from flowing. I read somewhere that people actually drill a hole in the cap. That didn't seem like the proper fix to me. I soaked it in Evaporust for a few days and then blew the passages clean with compressed air. That seems to restored the proper function of the gas cap and corrected the problem! I hope this helps others that may have the same problem.
Soaking in Seafoam works well too, as it dissolves the shellaced fuel hardened inside.

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RBGERSON
Posts: 2985
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Motorcycle: 98 SE GL 1500
had every year from 75 to 83

Re: Hesitation in throttle & stalling after a few miles

Post by RBGERSON » Tue Jun 27, 2017 2:58 pm

simpler test run it with the gas cap cracked a bit..not sealed down..tight. If the problem goes away Ok..but I kind of doubt it..bad gas my first guess..next floats sticking? Does gas weep out the pump's weep hole?? The OEM pumps even when they leak..usually pump enough fuel to run the bike. it would take a totally failure(big crack/hole) of the diaphragm to stop it working.

Might try after it dies drain the blows and see if there is any/how much gas is in each one should be about 1.5 oz.
HAD LOTS OF GOLDWING 75-83
NOW INTO 1500'S..RIDING A 1998 SE

FAIR WINDS,
RB

finalcut9
Posts: 10
Joined: Fri Dec 13, 2013 10:08 pm
Location: Portland, Maine
Motorcycle: 2012 GL1800
1975 GL1000
1972 CB350

Re: Hesitation in throttle & stalling after a few miles

Post by finalcut9 » Wed Nov 08, 2017 9:21 pm

Soaked the cap in seafoam and it seemed to work for a while but then started to stall again after riding it a while. If I crack the cap open a little but keep it on everything is fine so that's what I'm doing for now.



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