Compression issue

Information and questions on GL1200 Goldwings (1984-1987)
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Compression issue

Postby SAILOR » Mon Jun 13, 2011 11:18 pm

I recently did a head gasket change. My compression before and after is about the same 120. I then put a little oil in one of my cylinders and the compression jumped to about 160. I'm guessing this means I need a ring job. What does a ring job involve? Is it complicated to do? Bike seems to run fine with only 120 compression. I rode it around Mount Rainier this past weekend, 200+ miles. Is there really any problem driving it with low compression?

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Re: Compression issue

Postby dan1951 » Mon Jun 13, 2011 11:48 pm

Pressure of 120 is good, The oil is giving You the perfect seal around Your rings, Mine runs around 122P.S.I. and runs very good for it,s age, I would not worry about it. If You said 60-75 I would say valve job, Or and Bore and oversize pistons.

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Re: Compression issue

Postby WingAdmin » Tue Jun 14, 2011 3:17 pm

Perfect compression new from the factory for the 1200 is 185 psi. 120 is a little low, but certainly usable considering the bike's age. You won't be making the same power as when the bike was new, or getting the same mileage. More important is that all four cylinders are about the same pressure, which shows that they are wearing the same.

A new set of rings would certainly increase the compression, but you have to split the engine case and remove each piston to do it. Is a bit of power worth that hassle, particularly if the bike is running fine for you now?

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