Engine squeal after warmup


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Twag
Posts: 5
Joined: Wed Jun 16, 2021 7:02 pm
Location: Halifax, Nova Scotia, Canada
Motorcycle: 1986 1200 Aspencade

Engine squeal after warmup

Post by Twag »



I purchased a 1986 1200 aspencade. It didn't run when I got it. Cleaned the carburetors and gas tank. New fuel filter. Had to replace the pulse generators and one ignition coil was bad. Also installed new timing belts. Started up and seems to run good ( still have to tune the carburetors). But when I was on a test drive the engine had a squeal at idle after it warmed up. I don't know what the noise could be. Does anyone have any ideas as to what the noise could be. Thanks.



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AZgl1800
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Re: Engine squeal after warmup

Post by AZgl1800 »

If the belts are too tight, the Idle Tensioners will squeal.
~John

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Bike...and Dennis
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Joined: Sat Oct 06, 2018 2:33 pm
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Motorcycle: 1987 GL1200I

Re: Engine squeal after warmup

Post by Bike...and Dennis »

I'm not really hearing a "squeal". However, I detect a bit of a miss as you rev it up that might be the right belt one tooth off.
Sync the carbs and see how it sounds.
Sunshinenomad
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Re: Engine squeal after warmup

Post by Sunshinenomad »

I’m not hearing a squeal either. To make sure the belt pulleys aren’t worn, put a stethoscope on the belt covers.
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Nicksacco
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Re: Engine squeal after warmup

Post by Nicksacco »

Hi,
I'm not hearing a squeal per-se - but more of a slight chirping sound.
This to me sounds pretty normal.
I was expecting to hear that shreeking sound like a car when fan belt is bad.

Do make sure that you follow the belt tensioning procedure - don't add any extra tension.
Tensioners should be butter smooth when you turn them.
I assume that you changed the oil?
Aside from the noise, if the bike has sat for a long time you may also want to change oil after a hundred or so miles and check for sludge or other debris. Does the starter clutch engage properly? Sometimes the sprags can drag or slip.
Ride often and long!
Twag
Posts: 5
Joined: Wed Jun 16, 2021 7:02 pm
Location: Halifax, Nova Scotia, Canada
Motorcycle: 1986 1200 Aspencade

Re: Engine squeal after warmup

Post by Twag »

Hi everyone, thanks for the replies. I did check the tension of the belts and they were probably a little tight so I loosened the tension a bit. I put the bike to top dead center with the T1 mark and set the tension to about 3/16". The manual said 1/8" to 3/16". It actually stated in the manual that if the belts were too tight the belts would whine. I started the bike and it was quiet, but the bike was cold. The noise didn't happen yesterday unit after a short test drive and the bike warmed up. I think I will change the the tensioner pully's this winter as well. They are the originals. I see a couple of DIY threads on changing the tensioners.
FM-USA
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Re: Engine squeal after warmup

Post by FM-USA »

Your tension'r bearings might be a bit dry from sitting all that time. My 91 Wing's bearing were just that, pulled them out, used a fine pointed pick to remove the rubber seals. Cleaned, inspected then re-lubed. 40K later still running great.
Tho I do have a good set at the ready... never know when one will go kaputski. ;)
By-the-way, DO NOT use Moly paste in those bearings. It binds up the roller balls in the race. ( :? don't ask)
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Re: Engine squeal after warmup

Post by WingAdmin »

FM-USA wrote: Wed Sep 29, 2021 11:07 pm Your tension'r bearings might be a bit dry from sitting all that time. My 91 Wing's bearing were just that, pulled them out, used a fine pointed pick to remove the rubber seals. Cleaned, inspected then re-lubed. 40K later still running great.
Tho I do have a good set at the ready... never know when one will go kaputski. ;)
By-the-way, DO NOT use Moly paste in those bearings. It binds up the roller balls in the race. ( :? don't ask)
Moly paste/grease should NEVER be used on something that actually moves, like bearings, or a pivot. Moly is used to lubricate between things that have minimal movement with minimal clearance, like the splined driveshaft that fits into the final drive. Moly paste has a "carrier" grease whose purpose in life is to get squeezed out between the surfaces, leaving behind a fine layer of moly to do the actual lubrication.


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