Low compression - Steve Saunders Goldwing Forums

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post #1 of 13 (permalink) Old 10-07-2014, 05:25 PM Thread Starter
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Low compression

1988 GL 1500 #1/150lbs, #3/130, #5/#150. #3 has a wet plug that is getting spark. Appears that oil is on the plug. #5's plug appears to be burning very hot has almost a white look to the plug. #1's plug has a nice amber color.

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post #2 of 13 (permalink) Old 10-07-2014, 06:15 PM
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#3 & #2 are the most likely to foul/flood if you have drippy carbs (especially if your fuel petcock runs fuel with the bike off). Is your 88 equipped with the vacuum fuel petcock mentioned in 1500SB1 about carb vent hose routing (on this page **link**)

The compression numbers you have are not terrible... The manuals all mention stuff about higher values, but a 9.8:1 ratio pumping one atmosphere (14.7 psi @ 60F) is near 144psi without heating... and folks forget that the sliders on the 1500's carbs are nearly closed unless you're forcing them open. I don't know if I've ever seen a 1500 here that has anything better than your high values, and 130 is 7% lower, but nothing that shouldn't work
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post #3 of 13 (permalink) Old 10-07-2014, 06:32 PM
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The no. 3 cylinder on the 88 is where the vacuum source is for the fuel petcock and if the diaphragm is blown it can suck gas straight into the cylinder.

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post #4 of 13 (permalink) Old 10-08-2014, 05:49 AM Thread Starter
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Just ordered a petcock rebuild kit. Plan to start there. Also plan to run Seafoam through the crank case and inject directly into the #3 cylinder.

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post #5 of 13 (permalink) Old 10-08-2014, 09:16 PM
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Just ordered a petcock rebuild kit. Plan to start there. Also plan to run Seafoam through the crank case and inject directly into the #3 cylinder.
Why?

I want ride Tire Joe
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post #6 of 13 (permalink) Old 10-08-2014, 09:26 PM
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I agree with the sea foam. I've run it in all my older stuff and it seems to clean well. If you winterize, don't use it in that tank of gas, use stabil.

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post #7 of 13 (permalink) Old 10-09-2014, 09:45 AM
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If #3 is getting too much fuel the cylinder walls will be washed,hense the low compression on that one.Fix the fuel problem and your compression will come back in line.

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post #8 of 13 (permalink) Old 10-09-2014, 01:21 PM Thread Starter
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Got to start somewhere so I know my petcock is leaking. Can't hurt to rebuild.

What can I say, I\'m just a caveman.
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post #9 of 13 (permalink) Old 10-09-2014, 02:34 PM
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Originally Posted by cromagjeff View Post
Got to start somewhere so I know my petcock is leaking. Can't hurt to rebuild.
Test, Test, Test parts before replacing them. A little vacuum and the test is done. If you can use a straw you can test a vacuum petcock for diaphram leaks. Ask or search "how to test" before replacing parts and throwing your money away, or buy a new bike every few years.

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post #10 of 13 (permalink) Old 10-12-2014, 11:24 AM Thread Starter
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It"s alive!!!!!

After chasing a cylinder miss DriverRider mentioned that the #3 cylinder was the vacuum for the petcock. Looking at other Goldwing forums others agreed. I ordered the petcock rebuild kit from Cyclemax. I followed the video tutorial for rebuilding the petcock on Big Bikes Parts. Took longer to get to the petcock than it did to rebuild the petcock. Put it back on the bike and bam the power is back and the miss it gone! Thank you DriverRider . For once I started the simple and worked my way forward. Awesome forum.

What can I say, I\'m just a caveman.
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