farbeondriven

got a kawasaki 1100 stx rear cylinder 50 psi middle cylinder 100psi front cylinder 50 psi....Is this typical?

Jon1

Both end cyl's sound LOW to me

pwcpro

compression should be 120 psi. anything under 100 is unacceptable. time for a top end rebuild on that zxi.

farbeondriven

whats proper for an stx? not sure what zxi is

pwcpro

sorry, misread your model, but compression should be the same. as a rule for 2 stroke pwc, 2cylinders should have 150 and 3 cylinders should have around 120

farbeondriven

Yea gonna need to freshen up the top end....

Would you know if this is why i'm not getting any fuel to all the cylinders? I had removed all the carbs and cleaned and replaced some diaphrams..Also removed and inspected fuel pump....I can only get it to start by putting premix into the cylinders and once it finnaly starts it will run on its own...I even removed the fuel filter to rule that out....I can easily stop the flow out the return line with my finger easily...

Also i installed a gauge on the pulse line that goes to the fuel pump and it get around 5psi...

farbeondriven

have any recomendations for a top end kit ?

Correct me if wrong....I'm planning on needing the gaskets (jug, head and exaust) Rings for each cylinder and honing...

Not many hours on the machine and would like to stay away from boring and new pistons...

Btw oil pump failure caused these issues but that has been replaced now...tks

pwcpro

sbt has a cylynder exchange avail. that will include needed gaskets. if your ski has mikuni c.v carbs you may want to take them in to a shop that is familiar with the system. they can be complicated even for pros.

pwcpro

if hard staring is your only problem, install a primer kit in place of the choke.

farbeondriven

primer kit? Could you help me with a link or is it a home built item? thanks again for your help.....

also it is a cv but i dont think it's mikuni....there is no adjustments and it runs pretty darn good when its running just hard to get er started....