low compression


Information and questions on GL1200 Goldwings (1984-1987)
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debenn
Posts: 5
Joined: Thu Dec 12, 2013 9:58 am
Location: Fort Myers, Florida
Motorcycle: 1984 gl1200a

low compression

Postby debenn » Mon Sep 01, 2014 1:08 pm



I have an 84 Aspencade GL 1200 low power all cylinders have a compression of 120 checked it multiple times with throttle open all cylinders are the same any idea why it would be so low and is that partly why I can't get the power that it should have
I have a top speed of only 80 miles per hour
I'm considering going to carb conversion for the single carb any suggestions would be appreciated thanks



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HawkeyeGL1200
Posts: 918
Joined: Sat Jul 05, 2014 11:53 am
Location: Courtland, Va.
Motorcycle: 1984 GL1200 Interstate
1981 GL1100 Interstate

Re: low compression

Postby HawkeyeGL1200 » Mon Sep 01, 2014 2:06 pm

I'd ask what else you've done to resolve your lack of power other than a compression check. It may be something as simple as a plugged fuel filter robbing you of top end.
I am wrong as often as I am right concerning what is wrong with someone else' motorcycle without having seen the machine in person. Guessing with limited information, as to the source of the trouble, is sketchy at best.

debenn
Posts: 5
Joined: Thu Dec 12, 2013 9:58 am
Location: Fort Myers, Florida
Motorcycle: 1984 gl1200a

Re: low compression

Postby debenn » Mon Sep 01, 2014 2:09 pm

I have replaced the fuel filter, taken the carbs off and cleaned them, replaced the diaphrams that had holes in them
it is a new fuel pump and i checked the flow rate and it is within the parameters

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redbug
Posts: 256
Joined: Fri Sep 30, 2011 8:22 am
Location: Broken Arrow,Ok
Motorcycle: 1983 Gl1100I
1986 Harley FLHT

Re: low compression

Postby redbug » Mon Sep 01, 2014 5:37 pm

Ok, try this . Put a couple of squirts of engine oil (1/2 tsp.) in each cylinder and recheck compression. When the compression goes up, possible stuck ring. soak the cylinders in your favorite, seafoam, marvel oil etc. like overnight. recheck compression, if all come up and stay equal, good to go. If not , I would go to a cylinder leak down test. Let us know what you fine out.
" Ridin on Tulsa Time "

debenn
Posts: 5
Joined: Thu Dec 12, 2013 9:58 am
Location: Fort Myers, Florida
Motorcycle: 1984 gl1200a

Re: low compression

Postby debenn » Mon Sep 01, 2014 6:15 pm

already done all except the leak down test, with or without oil it is 120 lbs on all 4 cyls
dont have equip for leak down test, will have to take to shop for that
thanks

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dingdong
Posts: 2864
Joined: Thu Apr 08, 2010 8:35 am
Location: Oklahoma City
Motorcycle: 1976 gl1000
1993 gl1500
2004 NRX1800 Rune

Re: low compression

Postby dingdong » Tue Sep 02, 2014 7:05 am

Even at 120 lbs the bike should run just fine. "I cleaned the carbs" is the phrase that scares me. If you haven't done a complete tear down to get to all the jets and fuel / air passages you haven't properly cleaned the carbs. Sounds to me like that is what will be needed.
Tom

A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed.

debenn
Posts: 5
Joined: Thu Dec 12, 2013 9:58 am
Location: Fort Myers, Florida
Motorcycle: 1984 gl1200a

Re: low compression

Postby debenn » Tue Sep 02, 2014 7:10 am

when I say clean the carbs that's what I meant they were torn apart completely with the assistance of a retired Honda mechanic everything was cleaned as they should be just like it was in a regular Honda shop

User avatar
redbug
Posts: 256
Joined: Fri Sep 30, 2011 8:22 am
Location: Broken Arrow,Ok
Motorcycle: 1983 Gl1100I
1986 Harley FLHT

Re: low compression

Postby redbug » Tue Sep 02, 2014 7:55 am

Well, we will keep trying to figure it out with limited information on what you have already done. Clutch
slipping, brakes dragging, low voltage to coils, tire pressure, plug gap. What ideas did your Honda man have to say? Did you try another compression gauge ? Give us a report...
" Ridin on Tulsa Time "

debenn
Posts: 5
Joined: Thu Dec 12, 2013 9:58 am
Location: Fort Myers, Florida
Motorcycle: 1984 gl1200a

Re: low compression

Postby debenn » Tue Sep 02, 2014 8:19 am

he is thinking that the carbs need to be synced possibly doing a problem
down test but unfortunately I'm up in Canada right now and won't be back to my bike for another 6 weeks we quit working on it shortly ago and I just road my Kawasaki I will be back on it in about five to six weeks and do more testing and nail it down I like the idea of the single carb conversion makes things much easier to set the carb so we may try that just to see how it works
will keep you posted as we go along and find out the cause of my problem
thanks




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