1978 GL1000 Compression test


Information and questions on GL1000 Goldwings (1975-1979)
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Kbkc2002
Posts: 14
Joined: Fri Apr 17, 2020 8:33 am
Location: Tremonton, Utah
Motorcycle: 1978 Honda Goldwing GL1000

1978 GL1000 Compression test

Post by Kbkc2002 »



I have a 78 GL1000 with the engine off the frame and the starter is bad. Is it possible to do a compression test? And how would I do it without a new starter? Thanks
First time poster.


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GL1000K1dan
Posts: 34
Joined: Thu Aug 09, 2018 3:26 am
Location: England
Motorcycle: 1976 GL1000 K1

Re: 1978 GL1000 Compression test

Post by GL1000K1dan »

Why not try sourcing another starter from e.g. ebay. You may find other Honda models use the same starter.
Install it in your engine and hook it up to a battery. Obviously, ensure your engine is secure in some form of frame/stand so it can cranked over safely (ensure you haven't messed around with the timing belts etc.)
If your compression tester is anything like mine then it will come with longish rubber hoses with adaptors that you can screw into the spark plug holes. However, my experience using the rubber hoses is that you will get low compression readings. You may have the other fitment in the kit which is a short metal tube with a rubber end.
This I found gave more success in obtaining a proper compression reading. In your case, with the engine out of the frame, this may be a 2-man job as one person holds the rubber ended tube on top of the spark plug hole (takes a little muscle power to hold it in place) and the other person cranks over the engine. Although, I guess you could do both if you have no one to help.
Good luck.
Kbkc2002
Posts: 14
Joined: Fri Apr 17, 2020 8:33 am
Location: Tremonton, Utah
Motorcycle: 1978 Honda Goldwing GL1000

Re: 1978 GL1000 Compression test

Post by Kbkc2002 »

Thank you, I have looked at replacements but was hoping to make sure I had compression before spending more money. Bike has been sitting for 12 years and took a lot to free up the pistons. Is there a way without a starter? Like hooking a drill up to it aims cranking it that way? Thanks for your response.
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GL1000K1dan
Posts: 34
Joined: Thu Aug 09, 2018 3:26 am
Location: England
Motorcycle: 1976 GL1000 K1

Re: 1978 GL1000 Compression test

Post by GL1000K1dan »

Well, if you look on the positive side, if your engine is good (it is Honda after all) then you will need to purchase a starter at some stage. If you buy a second hand starter and the engine is a non runner (unlikely scenario imho), then you could resell the starter and get your money back and, in addition, the money you would get for the engine as spare part sales.
Kbkc2002
Posts: 14
Joined: Fri Apr 17, 2020 8:33 am
Location: Tremonton, Utah
Motorcycle: 1978 Honda Goldwing GL1000

Re: 1978 GL1000 Compression test

Post by Kbkc2002 »

True
Thank you for your help
dartman1962
Posts: 2
Joined: Tue Nov 03, 2009 11:37 am
Location: Saskatoon
Motorcycle: 1975 GL1000 Goldwing

Re: 1978 GL1000 Compression test

Post by dartman1962 »

Hi, You say the starter is bad! What is it doing?
I have a 75 which sat outside for 15 years.
What I did is pull the starter apart, check all connections inside, clean up the commutator segments, brushes & dirt in bushings, before I purchase a new one.
Mine was dragging a little bit I took it apart cleaned it all up, took it over to my local alternator/ starter shop he put rotor in a lathe & took some high spots off, cleaned on commutator & brushes, cleaned & lubed bushings.
Now it works great, so I would do that first!
You probably won’t even need a new one!
Kbkc2002
Posts: 14
Joined: Fri Apr 17, 2020 8:33 am
Location: Tremonton, Utah
Motorcycle: 1978 Honda Goldwing GL1000

Re: 1978 GL1000 Compression test

Post by Kbkc2002 »

The starter doesn’t turn at all. Took it apart and found that many connections had been soldered many times. Cleaned them and did some more soldering, but have tried four time and all have failed


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