Gl1000 rings and compression


Information and questions on GL1000 Goldwings (1975-1979)
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what_the?!
Posts: 7
Joined: Fri Sep 04, 2015 4:32 am
Location: adelaide
Motorcycle: 1975 gl1000

Gl1000 rings and compression

Postby what_the?! » Wed Jul 13, 2016 6:37 pm



My 1000 has had all gaskets replaced and o rings and shows 2cylinders at 100 psi and 2 at 110. If squirt oil into the cylinder through the plug and retest, I get 135psi.
So, I've eliminated valves and conclude rings. Does anyone know my options? Are rings available?
Cheers,
Tim



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julimike54
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Location: Euless, Texas
Motorcycle: 1986 GL1200A original owner
2016 HD FLTRU

Re: Gl1000 rings and compression

Postby julimike54 » Wed Jul 13, 2016 7:05 pm

So you may want to read through this GL1000 engine rebuild, lots of good info.
http://classicgoldwings.com/forum/viewtopic.php?f=22&t=10690
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Riding anything is a good day!
Mike

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virgilmobile
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Previously owned
78 GL1000
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84 GL 1200 I

Re: Gl1000 rings and compression

Postby virgilmobile » Wed Jul 13, 2016 7:56 pm

As i recall from some 10 years ago,I verified first the piston bore sizes and purchased from NAPA a full set of rings for a 70's model Honda CIVIC (probably a 78)for the $30 range.Research showed that the pistons size was the same for the CIVIC and the GL1000.Rod bearings were a bit wide but with some trimming they could be adjusted/trimmed/filed/plastigauged and fitted...No luck on main bearings.
My 78 had about 80 psi compression on a good day...The end gap of the rings in the bore couldn't be measured with a feeler gauge...I had to use a metal tape measure...It was close to 1/4"...Yea not 0.025...it was 0.25".I was supprised it ran at all but hey...It's a Honda.
After the re-ring which is tedious to put the other half back on while balancing 2 pistons and guiding the rings to compress.....It did finally crank it over cold with 145 psi before i even put it back in the bike.....
Crazy thing near seperated my arm sockets when I twisted the throttle wide open...Only thing that saved me was the front end started to come up.

By the way...how did you eliminate the valves as the problem...Wouldn't the oil also seal them for a quick compression test?
Were the head gaskets replaced and the valves not hand lapped?

what_the?!
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Joined: Fri Sep 04, 2015 4:32 am
Location: adelaide
Motorcycle: 1975 gl1000

Re: Gl1000 rings and compression

Postby what_the?! » Fri Jul 15, 2016 11:31 pm

Guys, the responses are excellent I have read the other thread and confirmed that the Rings are the problem. I will go and find some new rings fit them and post back the new compression readings.
I have a friend who owns a bike shop but doesn't do work on GL 1000s, but he will replace rings and machine valve seats and do general recondition also. He can deal with those nasty case bolts also that tend to stretch, break and strip...

what_the?!
Posts: 7
Joined: Fri Sep 04, 2015 4:32 am
Location: adelaide
Motorcycle: 1975 gl1000

Re: Gl1000 rings and compression

Postby what_the?! » Fri Jul 15, 2016 11:33 pm

I thought that I could eliminate the valves because when I had the heads off and cleaner was used in the head as I was removing carbon, it did not penetrate the seat.

Old Fogey
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1979 GL1000
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Re: Gl1000 rings and compression

Postby Old Fogey » Sat Jul 16, 2016 10:47 am

I have standard size rings in stock for all four cylinder models.
Cast iron rings for GL1000, full four cylinder set : $78
Chrome faced rings for GL1100 and GL1200, full four cylinder set: $95
Prices include shipping from the UK.
All I need is your email address, sent through a PM or email, or you can go to the WinGovations website and email me. I will send a Paypal invoice and post the day following payment.
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'Impossible' is just a level of difficulty! The only stupid question is the one you didn't ask first!

what_the?!
Posts: 7
Joined: Fri Sep 04, 2015 4:32 am
Location: adelaide
Motorcycle: 1975 gl1000

Re: Gl1000 rings and compression

Postby what_the?! » Mon Jul 18, 2016 11:04 pm

Old Fogey wrote:I have standard size rings in stock for all four cylinder models.
Cast iron rings for GL1000, full four cylinder set : $78
Chrome faced rings for GL1100 and GL1200, full four cylinder set: $95
Prices include shipping from the UK.
All I need is your email address, sent through a PM or email, or you can go to the WinGovations website and email me. I will send a Paypal invoice and post the day following payment.


gday mate- thank you for the reply. I guess I need to actually measure the state of the bore (it was in really good shape when I looked at it last, and still showed some cross hatch marks still).

im assuming that you don't have chrome faced rings for gl1000?

I noticed that rings come in over size specs also. are they for oversized pistons?, or for sealing a worn barrel?

thanks again,

Tim

Old Fogey
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Re: Gl1000 rings and compression

Postby Old Fogey » Tue Jul 19, 2016 9:18 am

No chrome rings for GL1000, sorry.
Oversize rings are for oversize pistons. If you still have hatch marks in the bores you do not need either.
Your engine needs to be very high mileage before it will need to be re-bored. We are talking at least 100-150K miles. My mate's bke has near 300k on it without being opened up for anything.
Or it has been badly maintained wth oil levels and changes.
OEM oversize pistons are almost imossible to find. Pattern ones are available. Machine shops don't like reboring these due to the blind bores on #1 and #3 cylinder.
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'Impossible' is just a level of difficulty! The only stupid question is the one you didn't ask first!

what_the?!
Posts: 7
Joined: Fri Sep 04, 2015 4:32 am
Location: adelaide
Motorcycle: 1975 gl1000

Re: Gl1000 rings and compression

Postby what_the?! » Tue Jul 19, 2016 6:27 pm

Excellent. Please PM me. Send you my details.




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