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81' KZ1000LTD no compression
- Kitten Tooth
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Thanks in advance and its good to be back guys,
KT
1981 Kawasaki KZ1000-K LTD
1983 Suzuki GS300L-D
1982 Suzuki GS300L-Z sold:(
1976 KZ400D3
1973 Z900... I WISH
DO A BARREL ROLL!!
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- missionkz
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It sounds more like all four cylinders have a bent valve(s) from neglect, rev ABUSE or massive overheat from no oil?.
Bruce
1977 KZ1000A1
2016 Triumph T120 Bonneville
Far North East Metro Denver Colorado
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- Z1Driver
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Blue 1975 Z1B
Red 2009 Concours 14
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- Patton
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Can perform a poor man's leak down test by introducing compressed air into a spark plug hole and listening to where it escapes from the combustion clamber. This may be done at TDC or any other cam positions where both valves are fully closed. Top dead center (TDC) is when the piston is at its highest position. An easy way to tell TDC is by alignment of the T mark with the case mark when viewed through the timing window.
May introduce a spurt of compressed air by using a rubber cone-tip blow gun (rubber air nozzle) held into the spark plug hole. And of course keep holding it in position to keep air from coming back out the spark plug hole while listening for escaping air at other places. The air compressor should not be running while listening because the noise will likely drown out any sound of escaping air.
May alternatively use a portable compressed air tank.
Air heard escaping from exhaust port indicates exhaust valve not fully closing (perhaps too tight clearance or damaged valve or valve seat).
Air heard escaping from carb intake indicates intake valve not fully closing (perhaps too tight clearance or damaged valve or valve seat).
Air heard escaping from crankcase breather indicates loss of compression past rings into crankcase (perhaps worn piston rings or cylinders).
Air heard escaping from head gasket area indicates indicates loss of compression past head gasket (perhaps due to a blown head gasket).
A leaking valve may sometimes be resolved by adjusting the clearance to within specs.
A leaking head gasket may sometimes be resolved by torquing the head fasteners when the engine is stone cold (such as after sitting overnight).
==========================
Another option while disassembled would be using a bore gauge and micrometer to determine whether bores and pistons are within spec, as described in the FSM.
Good Fortune!
1973 Z1
KZ900 LTD
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- SWest
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- 10 22 2014
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Admonishing someone that runs leaks that bad does no good. I prefer to not say anything not because it will hurt his feelings or teach him something, it's so I don't get a gut ache dealing with stupid. :whistle:
Steve
Viton seals. One of our members sells them.
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- Z1Driver
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Blue 1975 Z1B
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- Nessism
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Hope you checked the valve clearances before pulling off the head. Neglecting the valves is (sadly) extremely common and doing so results in poor compression and damage to the parts.
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- Patton
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Kitten Tooth wrote: . . . 81' KZ1000LTD . . . the cylinders/head are down at the machine shop. . . .
For what?
Good Fortune!
1973 Z1
KZ900 LTD
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- Olajoe
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- Kitten Tooth
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1981 Kawasaki KZ1000-K LTD
1983 Suzuki GS300L-D
1982 Suzuki GS300L-Z sold:(
1976 KZ400D3
1973 Z900... I WISH
DO A BARREL ROLL!!
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- Kitten Tooth
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missionkz wrote: Did you think to check the cam shim gap before tearing it apart?
It sounds more like all four cylinders have a bent valve(s) from neglect, rev ABUSE or massive overheat from no oil?.
Im almost positive he did all of these things. He kept bragging about how fast he could get it going and sustaining those high speeds as well. This engine wound up to almost redline for 5-10 minutes straight probably made it do some colorful stuff... especially when it was low on oil. He claims he had it up to 150 last year when it would still start. Mine was touching redline at 135 so maybe hes full of it. Though his gearing is different then mine because we changed the sprockets last year using a chart i found on here. i know its a 16 in the front. not sure about the back lol
1981 Kawasaki KZ1000-K LTD
1983 Suzuki GS300L-D
1982 Suzuki GS300L-Z sold:(
1976 KZ400D3
1973 Z900... I WISH
DO A BARREL ROLL!!
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- Kitten Tooth
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1981 Kawasaki KZ1000-K LTD
1983 Suzuki GS300L-D
1982 Suzuki GS300L-Z sold:(
1976 KZ400D3
1973 Z900... I WISH
DO A BARREL ROLL!!
Please Log in or Create an account to join the conversation.