Super Jet Odd pistons wear

[waterfreak]

https://www.slipstreamperformance.com.au/store/index.php?cPath=4_567

Here's the problem:
Symptom - Deposit on piston skirts.

Cause - Piston rings worn past the maximum ring end gap spec, glazed cylinder walls.

Reason - This is the most common problem we see. If the rings are worn past the maximum specification they allow combustion chamber gases to seep past the rings and down the piston skirt causing a distinct deposit pattern.

If the cylinder walls are glazed or too far worn the same thing will happen and even fitting new rings will not provide a good enough seal. In this instance the oil glazing must be removed and the cylinder re-honed to restore its cross-hatching, thus enabling new rings to wear to the cylinder and make a good seal.

 

[socal750]

I've seen rust build up on the cylinder walls from condensation in the pipe then building up in the cylinder... Then the next time you crank it over it scratches the pistons and cylinder walls... But that's usually after sitting for a while

 

[kevbo]

You dont believe the GroupK explanation in post# 16 ?

Its plausable, but Kawasakis are generally opposite. Maybe Kawasaki assembled their cranks to compensate for twisting. An easy way to test the theory is by switching ignition sensor to the PTO. If both cylinders ran cooler then the crank is indeed twisting. It is common for all engnes to have slightly different requirements between cylinders for various reasons. We tend to treat all cylinders as if they are identical but they seldom are.

 

[john zigler]

it is difficult to accuately tell jetting from plugs.....

your piston tops are black, lack of wash. you are LEAN. you "may" be rich on the low circut, but lean on the top end.

like stated, you also have alot of blow by. you need new, over sized pistons, bore your cyl to match, with correct piston clearances. then gor through your carbs, and possibly change jetting.....

 

[IS0LD0UT]

So does piston wash only tell you how lean/rich the high end is? How about when you spend most of the time with throttle less than wide open like in freestyle riding? Thanks.

 

[D-Roc]

If your ski does not load up or hesitate and throttle response is crisp, your bang on. Read the mikuni manual for more information on how to properly tune in the circuits.

 

[dmpus]

If your ski does not load up or hesitate and throttle response is crisp, your bang on. Read the mikuni manual for more information on how to properly tune in the circuits.

My ski has never loaded up or hesitated, and response has always been perfect.

 

[D-Roc]

Then your probably good. Work on dialling in you main jets and high adj screw. Go richer and test it out. Maybe your carbs need a good cleaning like mentioned previously. I sonic washed my carbs this past winter and they work good as new after 5 seasons of use.

 

[JetManiac]

Looks lean.