I?m trying to diagnose a dead #2 on my 83 gs750es. It has pods and was jetted but never ran well. I just realized #2 is cold so I tested everything i can think of. Valve clearance is spot on. I had an issue with my pickup coils being bent but fixing that didn?t make a difference. I swapped the plug wire between 2 and 3 with no effect. It is sparking the plug fine. The plug has gas on it when i checked its condition and gap. The confusing thing is the compression. I get 100 psi on every cylinder except 2 which is 130 psi. I?m not sure if im hearing things but when i have the guage on 2 and turn it over sometimes I hear a ? ting? sound. When I try to make it do it again I can?t, so I never get a good idea whats making the sound. I cant account for the high compression and the fact it wont fire with gas and spark. Is there a way just 2 can be out of time? I?m lost. I just rebuilt the carbs, the RIGHT WAY!, and replaced everything and dipped them - the whole 9 yards. I figured I better do that to rule out flooding in that cylinder. Please help.
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It's rare, but a plug can fire outside the cylinder, but under compression, not fire. swap the #1 & #2 plugs, just to be sure the #2 plug is firing under compression. won't take but a minute. If #1 quits firing, it's the plug.1983 GS1100E, 1983 CB1100F, 1991 GSX1100G, 1996 Kaw. ZL600 Eliminator, 1999 Bandit 1200S, 2005 Bandit 1200S, 2000 Kaw. ZRX 1100 -
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mine: 2000 Honda GoldWing GL1500SE and 1980 GS850G'K' "Junior"
hers: 1982 GS850GL - "Angel" and 1969 Suzuki T250 Scrambler
#1 son: 1986 Yamaha Venture Royale 1300 and 1982 GS650GL "Rat Bagger"
#2 son: 1980 GS1000G
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every o-ring, hard parts were soaked and cleaned like i said. I had dynojet #130 mains in and i swapped them for dynojet #124’s. No other changes. I have new intake boot orings but my testing did not show any vacuum leaks there, so I’m holding onto them for now.Comment
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#2 cylinder.....of course, you?ve ruled out petcock dribbling down its vacuum line.
? The plug has gas on it when i checked its condition and gap.?1981 gs650L
"We are all born ignorant, but you have to work hard to stay stupid" Ben FranklinComment
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Yeah. I don’t understand how anyone can have a tank on and off as much as you do during this sort of thing and not notice thatComment
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What are the chances the exhaust valves aren’t opening even though I measured clearance several times?Comment
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I suppose this weekend I’ll need to pop the top off again and just confirm valves moving and timing is on. Doesn’t seem to be a lot to timing this engine. I don’t see any adjustments at the pickups...
I just really think this is something with the engine more than anythingComment
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The pilot jet is the most common culprit. Under the Rubber plug next to the main jet. It has a VERY small hole in the end that can plug up in just a few weeks with Ethanol gas. You need a length of 30 gauge solid wire (.25mm) to clean it out. Hold it up to a light and make sure you can see through it. You DID put new rubber plugs in, right? You need them. I rebuilt a set of carbs in October and ran the bowls out of gas but didn't drain them. In February it wouldn't start and had 3 of 4 pilot jets plugged, and this in the # 1 and 2 bowls:
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09 Kaw C14 Rocket powered Barcalounger
1983 GS1100e
82\83 1100e Frankenbike
1980 GS1260
Previous 65 Suzuki 80 Scrambler, 76 KZ900, 02 GSF1200S, 81 GS1100e, 80 GS850GComment
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I popped the top and the valves aren?t sticking. They have to be shutting all the way because I have compression. Ive heard the gasket can go bad between cylinders and cause a cylinder to read high but I?d imagine the other cylinder would show some kind of loss as well.Comment
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Did this thing run fine prior to the work you did.
Or at least fire all four cyls?
How is 100 on 3 and 130 on 1 high compression?
You swapped plugs swap plug caps
or move coils.1983 GS 550 LD
2009 BMW K1300sComment
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Sounds like a carb problem.Ed
To measure is to know.
Mikuni O-ring Kits For Sale...https://www.thegsresources.com/_foru...ts#post1703182
Top Newbie Mistakes thread...http://www.thegsresources.com/_forum...d.php?t=171846
Carb rebuild tutorial...https://gsarchive.bwringer.com/mtsac...d_Tutorial.pdf
KZ750E Rebuild Thread...http://www.thegsresources.com/_forum...0-ResurrectionComment
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