Timing Belts


Information and questions on GL1200 Goldwings (1984-1987)
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BOSNBOB
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Motorcycle: 1993 ASPENCADE

Timing Belts

Postby BOSNBOB » Thu Jun 07, 2012 8:07 pm



Will timing belt make a big difference the way it runs. My 1986 1200 aspencade SEI runs rough at low RPMs, when I idle it up it goes away and smooths out. It has 82000 miles on it and I don't know the history of it.


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1993 Aspencade

Ghostrider52005
Posts: 124
Joined: Sun Dec 20, 2009 7:19 pm
Location: Olive Hill Kentucky
Motorcycle: 1985 GL 1200 LTD, 1984 GL1200 Interstate, VS 700 Suzuki Intruder.

Re: Timing Belts

Postby Ghostrider52005 » Thu Jun 07, 2012 8:42 pm

Id say it could make a little difference. I changed mine at 80000 miles and it did smooth it up a tiny bit. the old ones werent horrible, they were a bit worn, but i was doing a poor boy conversion and was in there anyway. I dont think it will cure your rough idle entirely though.

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SKMURDOCK
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Motorcycle: 1984 GL1200 Interstate

Re: Timing Belts

Postby SKMURDOCK » Thu Jun 07, 2012 10:15 pm

I am absolutely not the most mechanically inclined, but this sounds like a carb synch problem, at least as described in this "How To":

http://goldwingdocs.com/forum/viewtopic.php?f=11&t=81

Ghostrider52005
Posts: 124
Joined: Sun Dec 20, 2009 7:19 pm
Location: Olive Hill Kentucky
Motorcycle: 1985 GL 1200 LTD, 1984 GL1200 Interstate, VS 700 Suzuki Intruder.

Re: Timing Belts

Postby Ghostrider52005 » Thu Jun 07, 2012 11:43 pm

Being fuel injected not carbed the SEI and the LTD can only be synced left to right bank not front the rear and left to right like carbed models. And they seldom change once set up. Unless youve messed with the sync screw I doubt thats it.
Places to start looking would be to first check the condition of the vaccum hoses including the big one.
If you have the supplement for the SEI try reading the codes from the computer under the tour pack. Many times this will lead you to the problem.
When you start up cold does the fast idle work then drop the rpms when it warms up?

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thrasherg
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Re: Timing Belts

Postby thrasherg » Fri Jun 08, 2012 4:37 pm

Timing belts do not stretch, they just break or loose teeth!! This has nasty results for the engine, but as the belts do not stretch, changing a tired belt should have NO effect on the way the engine runs, just make it more reliable going forward. Based on what you are describing you either have a carb issue or I would venture to suggest valve issues. I would try to run a compression test on the 4 cylinders and see what it gives, I would also try a Randalls carb kit and give everything in the carb a good clean..

Gary

Ghostrider52005
Posts: 124
Joined: Sun Dec 20, 2009 7:19 pm
Location: Olive Hill Kentucky
Motorcycle: 1985 GL 1200 LTD, 1984 GL1200 Interstate, VS 700 Suzuki Intruder.

Re: Timing Belts

Postby Ghostrider52005 » Fri Jun 08, 2012 10:18 pm

I must be missing something here. He states he has an 86 SEI. That is fuel injected and everyone keeps talking about carb rebuilds and syncs when he has no carbs??? :?

As stated before a new set of belts wouldnt be a bad idea, they wont fix the rough idle though you will tell a slight difference in the way it runs if yours are the orginals, I bet I bet. ;)
That being said what normally will cause the LTD or SEI to misbehave is either vaccum lines to the FI, sensor being out of spec which normally the computer will flash a code for, or occasionally a little water in the gas or dirty injector. Run a little sea foam in a tank of gas. Check the codes on the computer and check your vaccum lines around the FI unit.
The reason I ask about your fast idle is if the air temp sensor isnt dropping the rpms from fast idle its could be keeping your bike running a bit rich at idle.

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thrasherg
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Re: Timing Belts

Postby thrasherg » Fri Jun 08, 2012 10:50 pm

Thanks Ghost rider, I am not familiar with the 1200 engine so have no idea if it has carbs or injection, I was trying to answer the timing belt question, if it is fuel injected then a carb overhall kit is a waste of money!! :lol:

Maybe some sea foam might help clean the injectors or as you state some of the vaccum advance pipes might be leaking or the sensors have gone bad. I would still run a compression test as poor compression will cause a poor low rev response and as the engine speed picks up the compression is less of an issue so it runs better, which sounds a lot like was described.

Gary

Ghostrider52005
Posts: 124
Joined: Sun Dec 20, 2009 7:19 pm
Location: Olive Hill Kentucky
Motorcycle: 1985 GL 1200 LTD, 1984 GL1200 Interstate, VS 700 Suzuki Intruder.

Re: Timing Belts

Postby Ghostrider52005 » Sat Jun 09, 2012 10:30 pm

Gary you are right on that low compression could cause his problem. But a 1200 engine is pretty bullet proof and 83000 miles really isnt that much milage for one if its been kept up at all.
I suggested checking his hoses and computer readouts and sensors first since that is usually what causes less than catastrophic failures in a 1200 and he can check all that visually and with a simple voltmeter.
Im assuming he doesnt have the equipment to do a compression test and would have to pay a shop an arm and leg to have it done. But if he has the equipment to do one by all means go ahead and do it. :)




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