Running good one second, not the next


Information and questions on GL1100 Goldwings (1980-1983)
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aussie280z
Posts: 10
Joined: Sat Apr 23, 2011 9:44 am
Location: Joplin MO
Motorcycle: 1980 GL 1100

Running good one second, not the next

Postby aussie280z » Fri May 20, 2011 9:13 pm



I have an 80 GL1100. I have owned it for about a month and have put about 2500 miles on it. It stumbles between 2000 and 4000 RPMs and I have run seafoam and everything else through it. Some days it runs better than others but there is always the problem. It has always idled fine and runs 4000 plus like a champ.

I started it up this morning to let it warm up and everything was fine. I went inside to get my gear and when I went back out a couple minutes later it was barely chugging along and died by the time I reached it. I started it back up but it barely runs and falls on its face as soon as you give it gas. With the choke on it will kind of run really rough.

I had been low on gas so I limped to the gas station and put gas in it. This changed nothing. I pulled the fuel lines off of the pump and valve and blew through them to see if the filter was plugged and i could blow through each direction fairly easily. I am at a loss as to which direction to go. I am sure it is carb related but I am not sure what I need to look for or what direction to go.

Thanks



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tallman21
Posts: 227
Joined: Tue Feb 15, 2011 8:09 pm
Location: Rahway, New Jersey
Motorcycle: 1980 GL1100i

Re: Running good one second, not the next

Postby tallman21 » Fri May 20, 2011 9:17 pm

is the breather hole in the gas tank clogged?

aussie280z
Posts: 10
Joined: Sat Apr 23, 2011 9:44 am
Location: Joplin MO
Motorcycle: 1980 GL 1100

Re: Running good one second, not the next

Postby aussie280z » Fri May 20, 2011 9:20 pm

Where do I find the breather hole? I have tried running it with the fuel cap off and that doesn't change anything. By the way, I love your bike. It looks alot like mine.

DragonRider
Posts: 136
Joined: Thu May 19, 2011 11:11 am
Location: Ocala, FL
Motorcycle: 1982 and 1983 GL1100 Aspencades

Re: Running good one second, not the next

Postby DragonRider » Fri May 20, 2011 11:21 pm

Lets look at everything, have you checked the air cleaner? if its plugged up it could cause the same problems. also how do the plugs look? you could be fouling out one or two plugs. Have you drained the carb bowls? these need to be drained regularly or water (and other unhealthy crud) may build up and cause just this sort of problem.

aussie280z
Posts: 10
Joined: Sat Apr 23, 2011 9:44 am
Location: Joplin MO
Motorcycle: 1980 GL 1100

Re: Running good one second, not the next

Postby aussie280z » Sat May 21, 2011 1:00 pm

Allright, I am planning on following Dragon riders reccomendation as soon as I get home, but I have a question. I have been reading through the forum and have a sneaky suspision that my fuel pump is bad. I have noticed pressure when I take off the gas cap and should have paid more attention, but I am new to this so I wasnt worried. While messing with the bike I disconnected the line from the pump and put my thumb over the intake and felt very little pressure. It has had me thinking and after reading the how to on the fuel pump I realize I have been running with an obviously gummed up gas vent.

aussie280z
Posts: 10
Joined: Sat Apr 23, 2011 9:44 am
Location: Joplin MO
Motorcycle: 1980 GL 1100

Re: Running good one second, not the next

Postby aussie280z » Sat May 21, 2011 8:59 pm

Update.

Checked plugs and air filter. Drained fuel out of carbs and bench synced the carbs. I started it up and ran smoother than it has since I owned it and reved up with very little hesitation.

I put on my gear and went to go for a ride and it has no power at all. It barely will pull itself from a dead stop. Once again I am thinking fuel pump. Is there a way to test the pump? Has anyone else had this issue?

DragonRider
Posts: 136
Joined: Thu May 19, 2011 11:11 am
Location: Ocala, FL
Motorcycle: 1982 and 1983 GL1100 Aspencades

Re: Running good one second, not the next

Postby DragonRider » Sat May 21, 2011 11:58 pm

Ok, I am going to go back to my old hot rodding days. The fuel pump is driven by the engine the best way to test and see if its working is to "temporarally" put a clear tube from the pump to the carbs. this way when you start the bike you should see fuel flowing, However this wont tell you what the exact pressure is but at least you will know if pump is working at all (usually they work or they dont).

While your at it look at the fuel lines, are any close to moving parts? I have had thottle lines pinch off a fuel line causing just this kind of problem on a differant bike (hey its worth a look). Fuel filter may "look" clean but may not be have you replaced it reciently?

I dont know if this will work but you could buy a cheap 12v electric pump (make sure it is fuel rated) and hook it up Bypassing the bikes pump, and take it for a short ride, if it works fine you have a pump problem, otherwise we are bake to step 1. just be safe.

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Pam
Posts: 311
Joined: Wed May 11, 2011 12:19 pm
Location: Canada
Motorcycle: 1982 Kawazaki KZ 1100 1983 Yamaha Venture Royal (sold and miss it) 2006 Goldwing GL1800 1992 Yamaha Virago

Re: Running good one second, not the next

Postby Pam » Sun May 22, 2011 9:58 am

I had the same problem with another bike. It would run then not run. I checked in the tank and there was all kinds of krud/rust, and a couple of dead moths. Took the tank off and cleaned it out. I haven't got back to see if that was the problem but the bottom of the tank was full of junk. Might be worth a look

frank

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RBGERSON
Posts: 2621
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Location: SCOTTSDALE, AZ
Motorcycle: 98 SE GL 1500
had every year from 75 to 83

Re: Running good one second, not the next

Postby RBGERSON » Sun May 22, 2011 10:04 am

take the out tube off the pump attach a temproary tube 2' long run to bottle start bike..fuel in bowls will run it for a few minutes at idle..let it run for 30 sec. at 3,000, measure output amount should be about 7.5 oz. if less pump is weak..if you have pressure gauge it should run at about 2.3 lbs. of pressure. Also there is a weep hole on the pump rear bottom..if you see staining there your diaphragm has a leak..so you are losing some pressure. Note these pumps are not designed to be rebuilt but can be if you know how..new ones can be had for about $80.
HAD LOTS OF GOLDWING 75-83
NOW INTO 1500'S..RIDING A 1998 SE

FAIR WINDS,
RB

aussie280z
Posts: 10
Joined: Sat Apr 23, 2011 9:44 am
Location: Joplin MO
Motorcycle: 1980 GL 1100

Re: Running good one second, not the next

Postby aussie280z » Sun May 22, 2011 1:52 pm

Well, I replaced fuel filter and pulled the carbs and just cleaned them with some carb cleaner by removing the tops and the bowls. I was hoping that something had gotten plugged since it ran fine one moment and not the next. No luck.

I also tested the output on the fuel pump and it filled a 20oz bottle in 30 seconds so it doesn't seem that it is weak. Next I am going to replace fuel lines and plugs. It that doesnt work I guess it is on to getting the carbs rebuilt.

DragonRider
Posts: 136
Joined: Thu May 19, 2011 11:11 am
Location: Ocala, FL
Motorcycle: 1982 and 1983 GL1100 Aspencades

Re: Running good one second, not the next

Postby DragonRider » Sun May 22, 2011 6:15 pm

Before investing in rebuilding 4 carbs lets look at everything again. to make an engine run we need air and fuel in the correct mix and a spark at the correct time, right?
bike will start and runs good at idle, Right?
But barely moves when you try to ride it, Right?

Ok you looked at plugs, air filter, fuel filter, fuel pump, carb bowls are drained, Fuel lines are not getting pinched?

Could bike be getting a weak spark? it may be good at idle but how about at 3000rpm, could this be just a set of high speed jets that need to be replaced (thats a bit cheaper than a total rebuild). one last thing is timing, could your timing belts be worn so that bike idles fine, but at higher rpms you loose your timing?

aussie280z
Posts: 10
Joined: Sat Apr 23, 2011 9:44 am
Location: Joplin MO
Motorcycle: 1980 GL 1100

Re: Running good one second, not the next

Postby aussie280z » Thu May 26, 2011 11:13 am

Well, after all of this I found out that I have no spark on my rear two spark plugs. I guess the next step is to change a coil. Do I have to pull the tank to do this?

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virgilmobile
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Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: Running good one second, not the next

Postby virgilmobile » Thu May 26, 2011 1:33 pm

The rear plugs are fired from the left coil.
Before you go and order a new coil,test it first.
switch the wires between the 2 coils and see if it still has spark only on the front.
Please pull the wires off the plugs and put on a old set of plugs to try this.
If the same wires have spark,the coil is bad.If it moves to the rear it's either the ignition module,pickup coil,or wiring.

aussie280z
Posts: 10
Joined: Sat Apr 23, 2011 9:44 am
Location: Joplin MO
Motorcycle: 1980 GL 1100

Re: Running good one second, not the next

Postby aussie280z » Thu May 26, 2011 9:02 pm

So the fronts work, then when I switch them, the backs work. So the big question is... Where is the cheapest place to buy a new coil?

wowimohsobored
Posts: 27
Joined: Tue Apr 26, 2011 12:34 am
Location: Kansas City Kansas
Motorcycle: 1981 GL1100

Re: Running good one second, not the next

Postby wowimohsobored » Thu May 26, 2011 11:48 pm

Check the pick up i ended up having a broke wire on my pick up coil , one moment it would fire others it wouldnt had the same problems u speak of

aussie280z
Posts: 10
Joined: Sat Apr 23, 2011 9:44 am
Location: Joplin MO
Motorcycle: 1980 GL 1100

Re: Running good one second, not the next

Postby aussie280z » Fri Jun 10, 2011 9:46 pm

I ordered a coil and it still doesn't work. I guess one of my CDI units is bad. When I switch the units it changes the set of plugs that work. I would love to buy a used one if anyone has one that works.

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cpawilly
Posts: 53
Joined: Sun Mar 06, 2011 1:50 pm
Location: Martinsburg, WV
Motorcycle: 1984 Interstate

Re: Running good one second, not the next

Postby cpawilly » Sat Jun 11, 2011 4:46 am

If all years are the same I should have one from my 82 parts bike.

Craig
816-992-0135

aussie280z
Posts: 10
Joined: Sat Apr 23, 2011 9:44 am
Location: Joplin MO
Motorcycle: 1980 GL 1100

Re: Running good one second, not the next

Postby aussie280z » Sat Jun 18, 2011 10:57 am

Finally!!! It runs! It turned out to be the CDI unit. It is going better than ever now. Thanks for all your help!

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florida_ump
Posts: 23
Joined: Wed Jun 01, 2011 11:02 pm
Location: Greensboro, NC
Motorcycle: '83 GL1100 Aspencade

Re: Running good one second, not the next

Postby florida_ump » Mon Jul 04, 2011 2:09 pm

Hi. I am having a very similar issue, except that when I lose power, I lose cylinder 1,3,&4. When I start it cold, it runs fine, then all of a sudden the bike bogs and dies. You changed a CDI. Please forgive me but what is that?

leanjoe
Posts: 70
Joined: Sun May 30, 2010 4:15 pm
Location: Henderson, Nv
Motorcycle: 82 GL1100a Aspencade

Re: Running good one second, not the next

Postby leanjoe » Tue Jul 05, 2011 11:22 am

Two small "Spark units" on left side ,under false tank.




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