Sounds flat


Information and questions on GL1500 Goldwings (1988-2000)
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pgjeepster
Posts: 28
Joined: Thu May 03, 2012 11:18 pm
Location: Prince George B.C.
Motorcycle: 1988 GL1500 Interstate

Sounds flat

Postby pgjeepster » Mon Jun 25, 2012 1:16 pm



Went into town today and the bike sounded different kind of flat not the usual snap. The exhaust from the muffler on the right feels cooler by at least 1/2 and it backfired twice while gearing down it also sounds funny gearing down kind of FUD FUD almost diesel jake brake sound. It seems to idle OK a bit of a putt putt from the right muffler as well the left muffler has about twice the exhaust force/pressure than the right. It kind of slugs away from a stop and doesn't really pull until you give it a fair amount of throttle and it hits around 3000 rpm. It also surges a little bit at steady throttle 2500-3000 3rd gear 30-40 mph at highway speed it runs OK. I think I will start with spark on all 6 although these are new plugs less than 2000 miles. Fuel issue?? Vacuum??Coil?? It sounds like a one cylinder issue to me?? I just got new timing belts so I'll put them on. Any other ideas would be really appreciated. Thanks guys.



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WingAdmin
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Re: Sounds flat

Postby WingAdmin » Mon Jun 25, 2012 3:49 pm

If you're going to pull the plugs anyway, take a few minutes and do a compression check on each of the cylinders.

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Kiwi2
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Re: Sounds flat

Postby Kiwi2 » Tue Jun 26, 2012 5:38 am

I know it sounds silly but did you close the choke once the bike had warmed up. I did the same once and wondered why mine coughed and snorted away and idled away like an old tractor. Just a thought.

pgjeepster
Posts: 28
Joined: Thu May 03, 2012 11:18 pm
Location: Prince George B.C.
Motorcycle: 1988 GL1500 Interstate

Re: Sounds flat

Postby pgjeepster » Fri Jul 06, 2012 8:42 pm

Well I finally got round to checking out the bike and it's running problems....... Did a compression check all around 225 psi.... checked the plugs for spark all are very very weak you can hardly see the spark on a sunny day when you cast a shadow over the plug this was on all the plugs I also changed all the plugs with the same result very very weak spark......I did change the timing belts and it went very smooth and easy thanks for the link on doing this it was a cake walk, real easy job no excuses for not doing it fellas. Took the bike for a run and from idle to 2400 rpm it really bogs and then at 2500 rpm it snaps into action and accelerates well. Electrical issue?
What would cause the weak spark?? What would you suggest I check into next?? Thanks a bunch guys you're great!

pgjeepster
Posts: 28
Joined: Thu May 03, 2012 11:18 pm
Location: Prince George B.C.
Motorcycle: 1988 GL1500 Interstate

Re: Sounds flat

Postby pgjeepster » Fri Jul 06, 2012 9:59 pm

PS I should mention that I have new battery as well so this problem is eliminated.

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zamboni920
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Location: Stavanger, Norway
Motorcycle: 1996 GL1500 SE with Hannigan 2+2 sidecar

Re: Sounds flat

Postby zamboni920 » Sat Jul 07, 2012 7:16 am

It seems odd that all plugs would have weak spark, yet the problem is most noticable on one cylinder bank only. I do not know much of the electrical on the GL1500.....it seems Virgilmobile is the guru on electrical here.
I would perhaps check vacuum to/from carbs. A leak on one carb only would affect one cylinder bank only. The 1988 has a myriad of vacuum lines, and are prone to trouble in this area.

pgjeepster
Posts: 28
Joined: Thu May 03, 2012 11:18 pm
Location: Prince George B.C.
Motorcycle: 1988 GL1500 Interstate

Re: Sounds flat

Postby pgjeepster » Sat Jul 07, 2012 8:00 am

The exhaust did feel cooler at the tailpipe but close to the head at the manifold all the headers feel the same temp when you start up each gets hot equal, it might just be one muffler is more blown out than the other. I am inclined to think it's electrical and something to to with spark as I said all plugs show a very weak spark.

pgjeepster
Posts: 28
Joined: Thu May 03, 2012 11:18 pm
Location: Prince George B.C.
Motorcycle: 1988 GL1500 Interstate

Re: Sounds flat

Postby pgjeepster » Sat Jul 07, 2012 12:00 pm

I spoke to the local dealer and was told that these bikes always look like they have a weak spark they are convinced it's a carb issue. Well i guess it wouldn't hurt to do a cleaning rebuild on it as well any suggestion on jets or anything else while I'm in there?

bustedwing
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Re: Sounds flat

Postby bustedwing » Sun Jul 08, 2012 9:54 pm

I would try Sea Foam to clean out the carbs, run a few tanks of gas thru but also check the vacuum lines as it is possible to have a small crack and that would cause the same problem.No I am not a salesman or anything for Sea Foam, but I do use it and it has worked for me.
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pgjeepster
Posts: 28
Joined: Thu May 03, 2012 11:18 pm
Location: Prince George B.C.
Motorcycle: 1988 GL1500 Interstate

Re: Sounds flat

Postby pgjeepster » Sun Jul 08, 2012 10:13 pm

bustedwing wrote:I would try Sea Foam to clean out the carbs, run a few tanks of gas thru but also check the vacuum lines as it is possible to have a small crack and that would cause the same problem.No I am not a salesman or anything for Sea Foam, but I do use it and it has worked for me.



Just put a full can of it in with a full tank of fuel tonight it actually started to smooth out the idle after about 5 mins of running I find I have a bit more snap with a bit of choke on. I'll let it sit over night and run it again for a 10-15 min idle and let it soak some more maybe some crud in there? It's a new bike to me don't really know the history too much.

bustedwing
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Re: Sounds flat

Postby bustedwing » Mon Jul 09, 2012 6:57 pm

Sounds like you are on the right track, keep it up and it should straighten out . Some take a little longer depending on how bad the shellack is built up.


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