not got myself a manual yet but i read on another thread that the standard Z1 900 compression figures are 121psi !!!!! that seems low to me compared to other makes of bikes.
anyone got the numbers for a 1978 Z1000 ?
I checked mine and they are between 135-140 psi.
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compression figures Z1000
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warren3200gt
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Re: compression figures Z1000
PUM 488 June 2026
76 Z900A4, 77 Z650B1, 77 KZ650B1, 77 Z1000A1, 82 Z1000J2, ZRX1100R.
76 Z900A4, 77 Z650B1, 77 KZ650B1, 77 Z1000A1, 82 Z1000J2, ZRX1100R.
Re: compression figures Z1000
nice one thanks
standard 128-156 psi, and mine is in the middle, and that was after its first start after 6 years, things will only get better
Re: compression figures Z1000
Factory minimum spec is 105PSI with no more than 15psi between any two cylinders.
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10% discount code Z1OCTEN
Keyster rebuild kits & carburettor spares - airscrews, jets, needles, starter plungers & gaskets.
Also petrol/ethanol proof float bowl gaskets. IMD pistons preferred seller.
Re: compression figures Z1000
Ultim8pc wrote:Factory minimum spec is 105PSI with no more than 15psi between any two cylinders.
mines a long way off from the minimum and due to it standing for over 6 years im sure it'll get better after some miles, its got 17.000 miles on its clock so i think its not a long way from being true !!!
ive got a 1980 GSX1100 with fairly good compression that stood for a long time with less than 10,000 miles on it, and after a few 100 miles the compression as come up to top spec.
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