GL1100 left side smoking white


Information and questions on GL1100 Goldwings (1980-1983)
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Ailingwing
Posts: 6
Joined: Wed Jan 09, 2019 3:40 pm
Location: Dallastown, PA USA
Motorcycle: 1982 GL1100, 1974 CL360, 1971 CT90, 1967 CL77 305

GL1100 left side smoking white

Post by Ailingwing » Wed Jan 09, 2019 3:58 pm



Here's what Ive done to try and mitigate this problem: New head gasket (was leaking coolant and oil around manifold and smoking like a biiiiiitch . :o :o -used OEM gasket at proper diameter), new valve seals, lapped valves lightly and tilt clearance of stems is within spec per my manual. Head was machined flat before installing. Compression 155 psi on ALL four cylinders. New water pump and associated oil seals and gaskets, Randakk's carb kit tackled step by step and everything replaced gingerly and double checked (my third set of GL1100 carbs rebuilt), new air filter, new fuel pump, filter and fuel lines, petock cleaned and rebuilt. Floats set at 15.2mm ( to allow more fuel because it's symptoms seem lean). Gas tank cleaned and re-installed. Ran brake cleaner through left headers when apart to begin to clean out baked-on oil deposits. Idle screws 3.25 turns out. New o rings on carb/head interface. New spark plugs gapped correctly and resistor caps. New battery, charging system working great. Synced carbs with mercury sync tool at 1000rpms. Ran marvel mystery oil and seafoam in engine oil and seafoam in gas for 25 miles on the road.

Problem: Starts up immediately with choke but left side warms up a wee bit slower than right but does heat up. Then it steadily and subtly backfires every few seconds mostly out of the #2 carb and a little out of the #4 carb. It hesitates on left side only when quickly throttled, right side fires up like a monster. I've screwed with carbs so many times I thought I'd ask for advice at this point... The slight backfiring is accompanied by white smoke which dies down to almost nothing, but takes 25-30 minutes to happen. Smells like oil to me. My only guess at this point is either timing (waiting on a strobe light in the mail to check) is early or late on 2 and 4 or the oil rings are failing and fouling the plugs. The plugs are nice and brown, I'm not seeing any oil though. But the white smoke smells like oil for sure. The smoke, stuttering-backfiring is getting to me after all this work and Im not sure what to check next. Thanks for any help that could be offered up!



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quasi2008
Posts: 109
Joined: Fri Oct 05, 2018 12:18 pm
Location: morgantown wv
Motorcycle: 1982 GL1100I INTERSTATE

Re: GL1100 left side smoking white

Post by quasi2008 » Wed Jan 09, 2019 4:16 pm

my 82 gl1100 was running fine then all of a sudden lost a bunch of power, throttle response was nil on takeoff. turned out the metering rod in the vacuum slide on #4 carb had fell apart. mine was smoking a bit also. might check the plug wires are not crossed to
man can't live on air alone!

Ailingwing
Posts: 6
Joined: Wed Jan 09, 2019 3:40 pm
Location: Dallastown, PA USA
Motorcycle: 1982 GL1100, 1974 CL360, 1971 CT90, 1967 CL77 305

Re: GL1100 left side smoking white

Post by Ailingwing » Wed Jan 09, 2019 4:43 pm

Have checked wires yep, they're correct. Hmm I'll check the slide for sure. Do you mean the needle? I buffed all four slides and made sure the needles were all the same height. Taking carbs out again this weekend. Thanks for the tip!

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Aussie81Interstate
Posts: 1063
Joined: Thu Nov 27, 2014 2:34 am
Location: Penrith Australia
Motorcycle: 2001 GL1500F6C Valkyrie
1982 CX500 Turbo (Historic registration - finally)
1981 GL1100 Interstate (sold)
1988 GL1500 (sold)

Re: GL1100 left side smoking white

Post by Aussie81Interstate » Wed Jan 09, 2019 6:24 pm

If the smoke is from the left side then do you leave the bike on the side stand ?
Could be some oil seeping past the valve stem seals...

Could also be the bike is still burning off some of the loosened oil in your exhaust as a result of the brake cleaner you have used - the oil residue might have been accumulating for a while..

If it is not blowing smoke after it has warmed up I would ignore it..

Ailingwing
Posts: 6
Joined: Wed Jan 09, 2019 3:40 pm
Location: Dallastown, PA USA
Motorcycle: 1982 GL1100, 1974 CL360, 1971 CT90, 1967 CL77 305

Re: GL1100 left side smoking white

Post by Ailingwing » Thu Jan 17, 2019 4:24 pm

I always keep it on the center stand. Synced carbs again to be sure, was a wee bit off but solid now. Still bogs down a bit when I snap throttle. While still connected, my vacuum gauges plummet when I floor it, then sky rocket. I would think they'd ramp up first when I hit throttle. Running better, but still the odd backfire. Tested timing and timing isn't EXACTLY on F each time but damn close. Still smoking. The stutter (backfire) and hesitation when I gas it from idle is the most frustrating. I can deal with a little smoke! May try taking carb bank off again and re-testing everything. Tried vacuum leaks by spraying starting fluid at various carb joints. No change in rpms......

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WingAdmin
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Posts: 19772
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: GL1100 left side smoking white

Post by WingAdmin » Fri Jan 18, 2019 10:09 am

Ailingwing wrote:
Thu Jan 17, 2019 4:24 pm
I always keep it on the center stand. Synced carbs again to be sure, was a wee bit off but solid now. Still bogs down a bit when I snap throttle. While still connected, my vacuum gauges plummet when I floor it, then sky rocket. I would think they'd ramp up first when I hit throttle. Running better, but still the odd backfire. Tested timing and timing isn't EXACTLY on F each time but damn close. Still smoking. The stutter (backfire) and hesitation when I gas it from idle is the most frustrating. I can deal with a little smoke! May try taking carb bank off again and re-testing everything. Tried vacuum leaks by spraying starting fluid at various carb joints. No change in rpms......
That's exactly the behavior you would expect when rapidly opening the throttle.

The vacuum is measured in the intake manifold between the throttle and the cylinder intake valves. When the engine is idling and the throttle is mostly closed, the engine is not drawing much air, and the throttle is at the maximum amount of restriction, so vacuum is relatively high.

When you rapidly open the throttle, all of a sudden there is little to no restriction to incoming air, AND at the same time, the engine still not requiring much air - so the vacuum plummets almost instantly.

As the engine speeds up, it starts drawing more and more air, more than can easily get past the throttle, so the vacuum drops once again.

Incidentally, this is the reason for accelerator pumps. When you rapidly open the throttle and the vacuum plummets, the fuel being drawn into the engine also almost completely stops - because the amount of fuel being sucked into the engine is dependent on the amount of vacuum present in the plenum. At low speeds it relies more on manifold vacuum to draw fuel (through the idle jet), at higher RPM it depends more on the vacuum generated by the volume of air flowing through the plenum (which is accelerated, causing a drop in pressure, i.e. vacuum).

Because the fuel almost completely stops, in order to keep the engine running AND make it start to accelerate, the accelerator pump squirts a little bit of extra fuel into the plenum. This gets the engine going, which speeds up RPM, which then raises vacuum, and things run normally.

This is why a malfunctioning accelerator pump or jet will cause the engine to bog down when the throttle is opened rapidly.

Check to see if you can see the accelerator pump squirting fuel when you rapidly open the throttle.

Ailingwing
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Location: Dallastown, PA USA
Motorcycle: 1982 GL1100, 1974 CL360, 1971 CT90, 1967 CL77 305

Re: GL1100 left side smoking white

Post by Ailingwing » Fri Jan 18, 2019 10:36 am

Thanks very much for the info. That makes it much more clear I appreciate it! Ok, I will pull carbs again and confirm the accelerator pump is injecting fuel when it should. It's a new pump assembly from Randakks, but I'm sure that doesn't mean it was installed correctly. Thanks again. Past 6000 rpm it screams like a maniac with no backfires or hesitation so just need to smooth out the low end. Have quite a few friends in CO and CA I intend to visit this summer and my GL1100 is the chosen steed.

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WingAdmin
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Posts: 19772
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: GL1100 left side smoking white

Post by WingAdmin » Fri Jan 18, 2019 9:13 pm

Ailingwing wrote:
Fri Jan 18, 2019 10:36 am
Thanks very much for the info. That makes it much more clear I appreciate it! Ok, I will pull carbs again and confirm the accelerator pump is injecting fuel when it should. It's a new pump assembly from Randakks, but I'm sure that doesn't mean it was installed correctly. Thanks again. Past 6000 rpm it screams like a maniac with no backfires or hesitation so just need to smooth out the low end. Have quite a few friends in CO and CA I intend to visit this summer and my GL1100 is the chosen steed.
You don't need to pull the carbs to do that - just pull the air filter out, you can see the accelerator pump squirting fuel in when looking down into the carbs then - without removing them.

Ailingwing
Posts: 6
Joined: Wed Jan 09, 2019 3:40 pm
Location: Dallastown, PA USA
Motorcycle: 1982 GL1100, 1974 CL360, 1971 CT90, 1967 CL77 305

Re: GL1100 left side smoking white

Post by Ailingwing » Sat Jan 19, 2019 11:29 am

Ok thanks. Should I look for it to squirt into the plenum chamber itself or into the carb chamber where the throttle valve is? Have a great weekend. I appreciate the advice

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OldguyGlen
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Location: Mound,MN
Motorcycle: 1980 GL1100 Interstate
1966 Honda 90

Re: GL1100 left side smoking white

Post by OldguyGlen » Sat Jan 19, 2019 11:49 am

Looking from the plenum into the carb, The butterfly you see is the choke (throttle is on the outboard end of the carb).
Acel discharge is the small brass piece.
See my post, with pic, about cleaning this port here:

viewtopic.php?f=4&t=48067

Ailingwing
Posts: 6
Joined: Wed Jan 09, 2019 3:40 pm
Location: Dallastown, PA USA
Motorcycle: 1982 GL1100, 1974 CL360, 1971 CT90, 1967 CL77 305

Re: GL1100 left side smoking white

Post by Ailingwing » Sat Jan 19, 2019 12:34 pm

Got it. Will check it out. Thank you Glen



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