No compression on # 1 & 2


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Rjohnson746
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No compression on # 1 & 2

Post by Rjohnson746 » Thu Jun 20, 2019 7:34 pm



Working on a 1990 gl 1500 that starts but revs really high and then falls to 800 rpm then dies. Getting good spark from coils compression on all but number 1 and 2 timing is good what else can I try to get compression back.



Rambozo
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Re: No compression on # 1 & 2

Post by Rambozo » Thu Jun 20, 2019 8:45 pm

Do a cylinder leakage test to find out where to look.

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virgilmobile
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Re: No compression on # 1 & 2

Post by virgilmobile » Fri Jun 21, 2019 11:20 am

This may sound strange but...
Remove all the spark plugs..
Put the bike in 5th gear..
Till the engine backwards several times..
Repeat this every few hours thought the day..
Let it rest overnight..
Compression test the next day.
Proven...some 1500's may have sticking valve lash pistons...
They pump up but done relax when the engine is shut off.This ends up keeping the valves open.
Even if this does restore compression,do a sea foam treatment and oil change.

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virgilmobile
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Re: No compression on # 1 & 2

Post by virgilmobile » Fri Jun 21, 2019 11:24 am

virgilmobile wrote:
Fri Jun 21, 2019 11:20 am
This may sound strange but...
Remove all the spark plugs..
Put the bike in 5th gear..
Turn the engine backwards several times..
Repeat this every few hours thought the day..
Let it rest overnight..
Compression test the next day.
Proven...some 1500's may have sticking valve lash pistons...
They pump up but done relax when the engine is shut off.This ends up keeping the valves open.
Even if this does restore compression,do a sea foam treatment and oil change.

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Mh434
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Re: No compression on # 1 & 2

Post by Mh434 » Fri Jun 21, 2019 2:20 pm

Concur on the SeaFoam treatment in the oil!! It can't hurt, and it could possibly save your engine!

Rjohnson746
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Re: No compression on # 1 & 2

Post by Rjohnson746 » Fri Jun 21, 2019 3:38 pm

The cylinders will not take air just comes out the air box

Rambozo
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Re: No compression on # 1 & 2

Post by Rambozo » Fri Jun 21, 2019 9:00 pm

Then you have leaking intake valves. You can try the above mentioned method to get the lash adjusters to compress. Or just pull the valve covers and check for bent valves or frozen adjusters. If the cam timing has ever been off, this engine bends valves.

Rjohnson746
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Re: No compression on # 1 & 2

Post by Rjohnson746 » Fri Jun 21, 2019 9:46 pm

Went ahead and pulled the head off and found the bad intake valve. Now the problem is finding the intake valve unavailable every place I look.

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MikeB
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Re: No compression on # 1 & 2

Post by MikeB » Fri Jun 21, 2019 10:00 pm

I do not know the difference between the 1990 and the other years but it appears that Partzilla has intake valves that fit just about all the GL1500 engines.
MikeB
Tacoma, WA, USA

Rambozo
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Re: No compression on # 1 & 2

Post by Rambozo » Fri Jun 21, 2019 10:15 pm

Looks like it might be easier to find a used cylinder head to get the valves from.

www.ebay.com/itm/272231111827

A good machine shop can probably make up a couple of valves for you from similar Honda car valves.

Rjohnson746
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Re: No compression on # 1 & 2

Post by Rjohnson746 » Sat Jun 22, 2019 8:38 am

That's a great idea I'll go that route.

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Mh434
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Re: No compression on # 1 & 2

Post by Mh434 » Sat Jun 22, 2019 9:16 pm

Any idea how/why those valves failed? It’s a failure I’ve never heard of before on a GL1500

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Re: No compression on # 1 & 2

Post by Rjohnson746 » Sun Jun 23, 2019 5:53 pm

I have no idea fixing it for a friend that took it to another mechanic for idle hunting issues . And got it back not running.

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Mh434
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Re: No compression on # 1 & 2

Post by Mh434 » Sun Jun 23, 2019 7:02 pm

Wow - sounds like the "other mechanic" must have done something catastrophic to damage or destroy the valves on 2 cylinders. Maybe messed with the timing belts, perhaps?!

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virgilmobile
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Re: No compression on # 1 & 2

Post by virgilmobile » Sun Jun 23, 2019 7:52 pm

Questions.
No compression on cylinders 1 & 2.
Did you pull both heads off and find "bad " intake valves in each one?
We're they bent?
Even that doesn't address the original idle hunt problem so beware of other issues.

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Re: No compression on # 1 & 2

Post by Rjohnson746 » Sat Jun 29, 2019 3:15 pm

Update: pulled both heads #1 bad exhaust valve #2 bad intake valve #6 leaking intake valve. fixed all that now just smokes out both exhaust. I was told it was rode a couple blocks with gas in the oil without knowing I'm thinking rings.

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Re: No compression on # 1 & 2

Post by DenverWinger » Sat Jun 29, 2019 7:35 pm

Run it a while to see if the smoke clears. May be as simple as a bunch of oil in the exhaust parts than needs to burn out.
♫ 99 Little Bugs in the Code, ♪
♪ 99 Bugs in the Code. ♫ :(
♫ Take one down, Patch it around, ♪
♫ 127 Little Bugs in the Code. ♫ ♪ :shock:

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Rjohnson746
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Re: No compression on # 1 & 2

Post by Rjohnson746 » Sun Jul 07, 2019 1:08 am

Rode it for about 20 miles and still smoking like a late fright. Can it be anything else other than the rings?

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DenverWinger
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Re: No compression on # 1 & 2

Post by DenverWinger » Sun Jul 07, 2019 6:43 am

Hmmm, This being a friend's bike, what do you know about the history? In all the threads I've read on here and other sites I only remember one other where someone had bad (other than bent) valves.

Almost sounds like it got very badly overheated to kill valves and rings. You might ask the owner... I would assume you had valve seals replaced when you did the heads, and I don't think they'd pass enough oil to smoke that much anyway. Maybe time to revisit the leakdown test.

Is there a chance the oil is overfilled? You mentioned gas in the oil earlier, might check to see if still smells like gas. Maybe an oil change.

Don't think these have a PCV valve on them....
♫ 99 Little Bugs in the Code, ♪
♪ 99 Bugs in the Code. ♫ :(
♫ Take one down, Patch it around, ♪
♫ 127 Little Bugs in the Code. ♫ ♪ :shock:

~Mark

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Mh434
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Re: No compression on # 1 & 2

Post by Mh434 » Mon Jul 08, 2019 12:06 pm

Hmmm - DenverWinger might be on to something. IF there's a bunch of gas in the oil, it will have raised the oil level WAAAY beyond the "max" level. That could certainly cause it to burn oil like crazy until the level is corrected....

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Re: No compression on # 1 & 2

Post by Rjohnson746 » Mon Jul 08, 2019 12:37 pm

Oil level is correct. What's the best brand to run ?

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Mh434
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Re: No compression on # 1 & 2

Post by Mh434 » Tue Jul 09, 2019 4:46 pm

A lot of us are running Rotella T5 with great success - it's certified for our type of use, and it's readily available.

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Re: No compression on # 1 & 2

Post by Rjohnson746 » Fri Jul 12, 2019 2:19 pm

DeverWinger you were right kept riding it and it stop smoking I thought I burned all the oil out but it is full and riding perfectly thanks all for all the help.

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Re: No compression on # 1 & 2

Post by DenverWinger » Fri Jul 12, 2019 7:01 pm

So glad to hear that's all it was!

Years ago I was working on a Mitsubishi Starion that had blown the bearings and seals on the turbocharger. Muffler and Catalytic converter (not to mention the intake side of the engine) just full of oil.

Took many days of just running the engine a few mins at a time. I was worried I'd get fire dept called on me, in just a minute or so it would make so much smoke I couldn't see the car!

Finally got the oil burned out of the exhaust though and it was fine after that!


♫ 99 Little Bugs in the Code, ♪
♪ 99 Bugs in the Code. ♫ :(
♫ Take one down, Patch it around, ♪
♫ 127 Little Bugs in the Code. ♫ ♪ :shock:

~Mark

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