compression

Hi All
I have got a Z2 kawasaki which is supposed to have a 1103 kit,under bucket shims and assorted other bits. When i bought it it was not running as the coils had burnt out.I replaced everything with Dyna coils and ignition and it starts and runs.No 1 cylinder(exhaust)does not get as hot as the other 3 cylinders,as if there is no spark,but there is spark and petrol.If you hold your hand over the carbs when running it sucks on the other cylinders,but on 1 there is just about nothing.Today i checked the compression and no 1 had about 95psi and the others about 125psi,after adding some oil to the cylinder it came up a bit.The bike was built in 2004 and has only done about 2000km on the engine.Whats the chances it needs new rings.Or does anyone have any ideas
Ian

very nice bike.... just get rid of the perforated steel heel guard and it will be perfect
would check the shims before everything else.

Hi
I took the cam cover off and had a quick look, definitely under bucket shims and all appear good and loose but have not tried with feeler gauge yet
Ian

good then,

would not even consider rings at this moment, even a piston with very bad and worn rings will still fire.

have you checked carb synch? if n.1 slide is low it'll give low comp reading too

stupid stuff like a jumping spark? have a go in the dark and see if you spot any

TG

PS where are you in scotland? (guess from the nick) i make it to inverness every now and then..

Run a leakdown test.

125 is pretty low as well, and 95 could be low enough to not fire. I mostly agree with guzzi though. Since it runs, I'd do a carb sync to see if that evens them all out, and make sure you're WOT when you test if you weren't that time.

Del_Herring wrote: 125 is pretty low as well, and 95 could be low enough to not fire. I mostly agree with guzzi though. Since it runs, I'd do a carb sync to see if that evens them all out, and make sure you're WOT when you test if you weren't that time.

agree that 125 is not that high but reason could be just the hot cams and the low piston could come up with some use if the engine stood for a long time.

sflaz1 wrote: Run a leakdown test.

If they ran those 1105 pistons in stock kz1000 sleeves and beat the hell out of it like Im betting they did,my guess would be worn/out of round bores

Thanks for the replies.
Turboguzzi I am in Australia,was born in Scotland hence the nickname. Wireman not sure what sleeves were used as the bike started life as a 750.the bike has stood for years as it has only done about 2000km in 8 years.I think the next step will be a leakdown test as you guys have suggested.
many thanks
ian

Would suspect too tight valve clearance on one or both valves in #1 cylinder.

Could allow acceptable compression test results, but cause loss of compression as engine warms.

Good Fortune!