Compression test....

Information and questions on GL1100 Goldwings (1980-1983)
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Joined: Sun Apr 07, 2013 8:53 pm
Location: Valparaiso, IN
Motorcycle: 1982 GL1100

Compression test....

Post by qualitytym » Mon Jul 14, 2014 2:59 pm

Tested my '82 GL1100 today with 129 K on her;
1 - 160
2 - 145 (170 wet)
3 - 162
4 - 169
Question is for a non engine rebuilding guy like me, is this a death sentence?
Seems odd with numbers like that one is off.
She runs like a dream, but Im not up for a rebuild.
Could this be a valve adj. issue on the low cyl? Seems odd one so low compared to thers

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Re: Compression test....

Post by WingAdmin » Mon Jul 14, 2014 3:12 pm

It could certainly be a valve adjustment - one simple way to know, adjust the valves (which is a regular maintenance item anyway) and see if the low cylinder comes up.

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Re: Compression test....

Post by RBGERSON » Tue Jul 15, 2014 8:00 am

+1 yep set your valves..but wet vs dry #'s not a good sign. But could be stuck rings which may loosen up with some miles OR adding some solvent to the cylinder let it sit for a while then run her easy..try again and then change your oil????


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Re: Compression test....

Post by moffat » Wed Jul 23, 2014 12:09 pm

Did you try all cylinders "wet"? Why did you decide to test the compression in the first place, was there a problem? If there is no appreciable smoke I would just carefully cap the valve adjustments and leave it alone as these engines are very tough. Did you test the compression with the throttle wide open and the kill switch off?

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Re: Compression test....

Post by f1xrupr » Thu Jul 31, 2014 6:18 pm

I baught a bike in December 2013 with 154200 miles on it that had been neglected, pulled it down to replace crankshaft bearings, and the rings were about 3.2 mm deep (almost no ware), and the factory cross hatch still visible, with no feelable ridge...amazing engine! (I did however find one half shell with .009 wear!). I doubt it has a broke ring. Maybe a burnt valve....maybe a piece of carbon got in the valve when you removed the plug? Maybe re check....or drive it another 100000, then check....
My exercise bike is a goldwing.

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Re: Compression test....

Post by Johnyy Smoke » Fri Aug 01, 2014 5:10 am

I wouldn't think a rebuild we required anyhow. Ride on! Regards, Johnyy

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