Compression Question

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08 Feb 2006 19:58 #22636 by crewzzn88
Compression Question was created by crewzzn88
1.What should my 1979 KZ650 SR compression be?

2.#1 cylinder is cold to touch while running.

Bio on bike= been sitting for years, carbs have been rebuild, new points and new spark plugs, static timing has been done. coils have correct readings.


Compression issues should be in the engine section. I am moving this thread. wiredgeorge/moderator

Post edited by: wiredgeorge, at: 2006/02/09 08:36

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08 Feb 2006 20:08 #22640 by RomSpaceKnight
Replied by RomSpaceKnight on topic Compression Question
I think it should be any where from 120 to 150 psi, depending on engine wear. The cheap handheld testers are not that accurate. Is that the exhaust pipe on #1 that is cold. That would not be good.

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08 Feb 2006 20:27 #22647 by GargantuChet
Replied by GargantuChet on topic Compression Question
150 PSI sounds good, measured with the bike warm, and be sure to hold the throttle WIDE OPEN while testing. The choke should be open also (lever pushed all the way down).

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09 Feb 2006 01:54 #22671 by Duck
Replied by Duck on topic Compression Question
If you've got over 100 compression in #1 and fuel and air and plug boot is good, it's got to be your plug. Buds XS650 quit firing on left last week and it was the plug. Looked good, made spark when out of cylinder, but wouldn't fire on either side when installed.

-Duck

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09 Feb 2006 07:12 #22703 by OKC_Kent
Replied by OKC_Kent on topic Compression Question
I've heard that some bad plugs can fire in the open air, but when subjected to the engines compression they don't do a thing.

Oklahoma City, OK
78 KZ650 B2 82,000+ miles

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