Z1OwnersClub GB

Hi all,Can anyone let me know the correct compression rating i should be getting when engine is cold on my Z1B? i have seen various values stated from 100 psi (service limit) to 150 psi....Cheers Pauljac...

Ok........ before anyone slags me off for trying to help - I have read that .....

You should check compression of a warm engine

The range is wide to take in many variances (engine build tolerances, carbon build up, some ring wear/leak, etc).

Depending what you get, will give some indication on engine wear....

If its getting toward the lower end, you can then retest with a bit of oil down the bores.... If the comp goes up its most likely ring/bore wear. if it remains the same, could be valve wear

Also, there shouldn't be more than 10% difference between each cylinder

Hi Pigford what do you reckon is the minimum psi you should expect? Cheers Paul J....

Warm motor..... Personally I'd want at least 120 psi........ But thats not to say less, is worth an engine rebuild

See what some of the others say ........ Were you have problems before...

Smokey, piston slap, poor mpg, bad starter....

Just curious, now i have rebuilt top end before was running fine just smokey on start up...was getting 125 psi when warm on three pots slightly less on one.yet my a4 gives 150 psi on all four!!!.By the bye you dont have a decent colour coded circuit diagram for a z1b by any chance? or a description of the operation of the brake outage relay and the brake circuit wiring?? Cheers Paul J..

No colour diagrams.... but someone on here must have

Chap in the Scotland does em on ebay.

http://cgi.ebay.co.uk/KAWASAKI-Z1-Z1A-Z ... 240%3A1318

Have I read this correctly, it seems to me that your getting less psi now than pre head rebuild! Did you have the valves re-faced & seats cut or just lap the valves with grinding paste? If the latter I'd say you've got a valve or two letting by. As said before squirt a small amount of oil in the bores & retest on a warm engine with throttle wide open. If the readings stay the same you need to inspect the head again. Valve clearances all OK?

Mike

See my post in outage switch !