89 1500 rough idle and run


Information and questions on GL1500 Goldwings (1988-2000)
  • Sponsored Links
89 1500
Posts: 6
Joined: Sat Jul 19, 2014 2:29 pm
Location: Texas
Motorcycle: 89 GL1500

89 1500 rough idle and run

Postby 89 1500 » Sat Jul 19, 2014 2:45 pm



Afternoon everyone. I just installed a speedo cable in my 89 wing had to be one of the easiest repairs to do on a wing. Anyway Before I did it the bike ran fine it parked for a day I installed the cable and when I started it gawd only on 4 cylinders at best. The only thing I did differently from factory was bypass the holder in front of the bottom tree. I grabbed my bottle of sea foam and dumped half in the tank. Went down the road for fresh gas. There was a funky old gas smell and an occasional pop out of the right bank. It runs fine above 2600rpm and at hiway speed. You can hear the other cylinders coming in and out at 40 mph and it go's back to tractor idle at a stop. I'm going out to strip tupperware so I can get plugs out and while I'm there pull the K&N for a cleaning. I can't make sense of it as I said it ran great 24 hours ago. Could there possibly be something around the speedo head or under the fairing in front that I unplugged causing this? TIA for any direction and help on this.



bustedwing
Posts: 1052
Joined: Wed Nov 30, 2011 4:17 pm
Location: Hermansville, Mich
Motorcycle: 1990 Gold wing Trike
Contact:

Re: 89 1500 rough idle and run

Postby bustedwing » Sat Jul 19, 2014 9:02 pm

If there was a "funky old gas smell " could it be possible that you have some bad gas? Had the bike been sitting and the bad gas still in the tank? You are using the right product but it still won't run good until all the bad gas gets burned up, it just helps the process. Is it about due for spark plugs? Air filter you said you cleaned, did you blow dry it? If you can, drain out the last of the bad gas or run it until it clears up.
Proud member Patriot Guard

User avatar
robb
Posts: 1040
Joined: Mon Jul 19, 2010 7:46 pm
Location: Lexington, North Carolina
Motorcycle: 1989 Honda GL1500 Aspencade

Re: 89 1500 rough idle and run

Postby robb » Sat Jul 19, 2014 9:59 pm

Half a can of Seafoam in 5 gallons of car can idle nasty till it is run through.

89 1500
Posts: 6
Joined: Sat Jul 19, 2014 2:29 pm
Location: Texas
Motorcycle: 89 GL1500

Re: 89 1500 rough idle and run

Postby 89 1500 » Sun Jul 20, 2014 8:25 am

When I found it 3 years ago it sat for a while. Other than that it sat in the garage overnight. I screwed a new set of plugs to it changed the fuel filter cleaned the k&n good and let it dry in 100 degree day for 4 hours. I've used full cans of sf and it never caused any running issues with anything I'd worked with. It's just got that tractor idle until I get the r's up and it runs better off throttle going down hill you can hear it's not on all 6. I guess I'm going to give it a few days maybe I picked up some bad gas let the sf work.

User avatar
Mh434
Posts: 942
Joined: Tue Mar 25, 2014 10:24 pm
Location: Victoria, British Columbia, Canada
Motorcycle: 1997 gl1500 SE
Previous:
1981 GL1100I
1989 Kawasaki Concours

Re: 89 1500 rough idle and run

Postby Mh434 » Sun Jul 20, 2014 11:37 am

It sure sounds like bad gas. Any chance you gassed up around the same time (or shortly before) the troubles started? I've had this happen myself, several times, on different bikes, and it was ALWAYS bad gas (usually, a lot of water in the fuel, from a gas station with nearly empty tanks - coincidentally, always Shell stations).

Here's a cheap fix, if this could be the problem - buy a bottle of gas line antifreeze & dump 1/2 of it in the tank. It will allow any accumulated water in the fuel tank to mix with (essentially, dissolve in) the gas & get burned. If you can't find gas line antifreeze, a little methanol might work, too.

It couldn't hurt, and it might solve your problem. Cost = less than $1.00.

89 1500
Posts: 6
Joined: Sat Jul 19, 2014 2:29 pm
Location: Texas
Motorcycle: 89 GL1500

Re: 89 1500 rough idle and run

Postby 89 1500 » Sun Jul 20, 2014 12:07 pm

I put in the new speedometer cable super easy fix btw. Started it and I could hear it was down a few cylinders. It ran perfectly the day before. I had 2 gallons of fuel left in the tank when the problem started then I filled with fresh fuel and added a can of seafoam. Seems to be what everyone I know is thinking (bad fuel) too I have some r/c car fuel that's methanol with 25% nitro added. It's been in a sealed can but I've had it for a while. The nitro should be almost to nothing if the methanol still smells good I might add an ounce or two.

bustedwing
Posts: 1052
Joined: Wed Nov 30, 2011 4:17 pm
Location: Hermansville, Mich
Motorcycle: 1990 Gold wing Trike
Contact:

Re: 89 1500 rough idle and run

Postby bustedwing » Sun Jul 20, 2014 12:18 pm

I believe that you would be better off running the bike to get the bad fuel out. Adding another component to the mix you have in there already could be disastrous.
Proud member Patriot Guard

89 1500
Posts: 6
Joined: Sat Jul 19, 2014 2:29 pm
Location: Texas
Motorcycle: 89 GL1500

Re: 89 1500 rough idle and run

Postby 89 1500 » Sun Jul 20, 2014 12:33 pm

Your right about that and it would be my luck too. As crappy as it's running I'll go through this tank within the week. I'll just deal with the crappy to go like hell acceleration and put up with the surge. Hopefully it won't last too long.

User avatar
Mooseman
Posts: 383
Joined: Thu Sep 10, 2009 11:10 am
Location: Napa, CA
Motorcycle: 1996 GL1500SE 88k
1986 GL1200A (SOLD) 81K
1985 GL1200A (SOLD) 85K
1986 BMW K75c 25K

Re: 89 1500 rough idle and run

Postby Mooseman » Sun Jul 20, 2014 10:28 pm

I would do a little snooping around with a spray can of starter fluid. I have read where there is a vacuum hose under the air filter box that gets a burned spot in it causing a vacuum leak. Apparently has a 90 degree bend that can cause problems. Been reading a lot about the 1500 since I now own one.... Keep us updated on what you find.
Mel
Enjoy the ride. They are all good, just some better than others.
Mooseman

bustedwing
Posts: 1052
Joined: Wed Nov 30, 2011 4:17 pm
Location: Hermansville, Mich
Motorcycle: 1990 Gold wing Trike
Contact:

Re: 89 1500 rough idle and run

Postby bustedwing » Mon Jul 21, 2014 9:25 am

You can do the same thing with a squirt oil can and it's not so explosive.
Proud member Patriot Guard

89 1500
Posts: 6
Joined: Sat Jul 19, 2014 2:29 pm
Location: Texas
Motorcycle: 89 GL1500

Re: 89 1500 rough idle and run

Postby 89 1500 » Fri Jul 25, 2014 10:33 am

Just a quick update on getting rid of this demon. I stripped the tupperware and opened the airbox this morning getting ready to chase vacuums. Just for grins I thought I'd spray the slides with carb cleaner incase they were sticky from old K&N oil or something. Hit the right one and it tried to kill the motor then to the left and found my issue. Something in the left carb. I wished I could just pull one but looking at my manual that's not happening. Going out again to find my tape to mark lines and start digging out the carbs. :evil: :evil: :roll:




Return to “GL1500 Information & Questions”




Who is online

Users browsing this forum: Google [Bot] and 3 guests