My Kz 1000ltd lost compression in the 2 middle cyl

wile I was riding the bike I lost power but still ran. I noticed the 2 middle pips were cool when I got home and I checked to see if I had compression and I lost all in my 2 middle cylinders. any ideas on what it could be..

Would cross fingers and check valve clearances.

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Hello, Mike and WELCOME to KZR!

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thanks man. I took the valve cover off and by looking at it they seem about the same. when I turn it over it looks like its working well ports were all opening and closing in all 4 cylider but I will check it any how. Im so mad it was running so good I need all the help I can get thanks.

Probably a dumb question on my part but did the compression tester work ok with cylinders 1 and 4 ?

Hard to imagine both 2 and 3 lost compression at same time.
Possible though
The one ignition coil fire 2 and 3

Mike, I'd pull #'s 2 & 3 plugs & perform a leakdown. A blown head gasket between 2 & 3 would cause your' prob. & not be apparent from the outside. luck G

gane wrote:

Mike, I'd pull #'s 2 & 3 plugs & perform a leakdown. A blown head gasket between 2 & 3 would cause your' prob. & not be apparent from the outside. luck G

i m with gane.....could have let go and is blowing compression down the cam chain tunnel.....see if you have a lot of oil where the breather ends up...should be near the air filter on a stock bike.....its a possibility....

kz1000ltdrider wrote:

...took the valve cover off and by looking at it they seem about the same. when I turn it over it looks like its working well ports were all opening and closing in all 4 cylider but I will check it any how....

Will need a thickness gauge.
Correct valve gap is 0.05 mm ~ 0.10 mm.

It's okay to go slightly wider, but wouldn't exceed 0.15 mm.

Need any help with the valve gap checking procedure?

Btw, what year bike?

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yeah I am thinking its a gasket.. I had a leek down test about 3 weeks ago and the lower end droped presshor in the middle cylinders some.. what happend I was out rideing and was on the throttle pritty good and let off of it and down shifted a gear and then it lost power.. it sounds like a dirt bike now. Could of been to much for the old girl. I love the bike so im gunna fix it.
thanks for all the help guys and gals Im open for all ideas on this one it all helps. I am happy to find this site its lots of help.

its a 1977 ltd thanks

more than likely the culprit.....stock is a two pc gasket with a rubber oring around the can chain tunnel...if the edge of the gasket goes, it doesnt take long for 33 year old rubber to go south.....a rebuild includes a one pc gasket and rtv in the groove where the rubber once was.....
sorry to hear and good luck...all is not lost...its fixable....

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