found a nice 87 gl1200 with low compression


Information and questions on GL1100 Goldwings (1980-1983)
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serensct
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Motorcycle: 1983 gl1100 interstate

found a nice 87 gl1200 with low compression

Postby serensct » Fri Apr 04, 2014 3:56 pm



Does anyone know if an 81 or 83 gl1100 motor and transmission will bolt up in a 1987 gl1200. Im also interested in getting the bike and buying a motor or repairing the motor. All replies would be appreciated.



goldminerusa
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Motorcycle: 1982 gl 1100standard, 1983 1000c

Re: found a nice 87 gl1200 with low compression

Postby goldminerusa » Sat Apr 05, 2014 7:04 pm

I was told on this site 2yrs ago that a 1200 motor would not fit in a `81-`83 frame, it would seem the reverse also would not work.

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serensct
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Motorcycle: 1983 gl1100 interstate

Re: found a nice 87 gl1200 with low compression

Postby serensct » Sat Apr 05, 2014 7:11 pm

That makes sense to me to, ok thank you.

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serensct
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Motorcycle: 1983 gl1100 interstate

Re: found a nice 87 gl1200 with low compression

Postby serensct » Sat Apr 05, 2014 7:20 pm

I've read up on this subject and I think it would be a little dumb even if I could because of the size and weight difference in the two. I found a really nice 87 im looking into purchasing its cheap. it has low compression coul you guys give me possibilities of why so I can determine if its a project I am interested in tackeling.

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Fatwing Chris
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Re: found a nice 87 gl1200 with low compression

Postby Fatwing Chris » Sat Apr 05, 2014 7:22 pm

Have you done a compression check yourself?Unless it broke a timing belt and bent some valves I doubt there is too much wrong with it.It takes a lot of abuse to destroy one of these motors.If it's sat for a long time it could be just stuck rings and could maybe be sorted out without pulling it apart.I'd look into it a bit closer before I pull anything apart.
If I'da known it would last this long,I'da taken better care of it.
Chris
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serensct
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Location: Columbus, Ohio
Motorcycle: 1983 gl1100 interstate

Re: found a nice 87 gl1200 with low compression

Postby serensct » Sun Apr 13, 2014 6:45 pm

its not froze up it had belts on it. when I first got it it would not turn. I turned it backwards a quarter turn then went back normal direction and it freed it up but wouldn't turn with starter. was gonna take off starter test rebuild whatever. when I took it of oil poured from motor. Is this normal? My other gold wing in the avatar when I did the starter on it no oil came out of motor. the starter hooked up to battery in my other bike direct turned freely. installed it will not budge.

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Re: found a nice 87 gl1200 with low compression

Postby bustedwing » Sun Apr 13, 2014 8:28 pm

I agree with FatWing, it's highly unlikely to have a engine with low compression . It's possible that from sitting that valve seats may have carboned up in turn loosing some compression. Compression rings will stick at times, but those can be loosened up by squirting some transmission fluid into the cylinder and let it sit, at least overnight. Depending on severity, several dosages might need to be applied. Once you start the engine be prepared for a large smoke cloud. But very hi detergent will clear out carbon and oil deposits. Works great.
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wae
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Motorcycle: 1984 GL1200 Aspencade (parts)
1987 GL1200 Interstate

Re: found a nice 87 gl1200 with low compression

Postby wae » Wed Apr 16, 2014 1:29 pm

I'm not 100% sure, but if the bike you were looking at was in Columbus, OH and was orange, I actually bought that last week with intentions to chuck the motor and replace it with the running gear from an '84 Aspencade. I was advised to check it myself and I did just that last night. The shop that I bought it from said that the motor was basically no good because it smoked and had low compression. I let it warm up, then did a compression check with the throttle all the way open and it came in at 160psi on 3 cylinders and 155psi on 1. The smoke is from oil leaking out of (probably) the shifter seal or (maybe) a valve cover or something onto the exhaust pipe on the left side. It did need a new solenoid, the tires are bad, and I think the starter is on its way out. It's also orange.

Everything that I searched on seemed to indicate that 150-160psi was good, and I've always worked under the premise that as long as every cylinder is within a 10% variation there's nothing to really worry about. I did accidentally check one cylinder with the throttle closed, though, and got a reading of just barely 90psi, so maybe that's what happened to make them think it was low comp.

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Fatwing Chris
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Re: found a nice 87 gl1200 with low compression

Postby Fatwing Chris » Wed Apr 16, 2014 5:30 pm

Didn't think the motor would be toast.
If I'da known it would last this long,I'da taken better care of it.
Chris
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moffat
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Motorcycle: 1982 GL1100
Interstate

Re: found a nice 87 gl1200 with low compression

Postby moffat » Fri Apr 18, 2014 1:57 am

These engines can give misleading symptoms! I have had good compression of 170 psi on all cylinders and new valves/seals/guides and the thing still smoked!!!
If the oil control rings are out of tolerance the bike will smoke whilst the compression and scraper ring are in good condition thus giving good compression readings. I overhauled my bike twice due to oil control ring wear.




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