compression loss

[noah45]

750SX. Limited mod

A little too much water in engine compartment. Lost compression(90lbs/cylinder)
Do I need to rebore(and replace w/ oversized pistons) if existing pistons are in good shape? Or can I just replace rings, and hone (to get back to 170lbs.)

Our Jetski Dealer did the whole enchilada last time when the 650SX ingested, seemed alittle bit of overkill.

 

[monsterSJ]

depends wether the cylinder is scored or not if not then hone and replace pistons and rings if pistons arent hurt then just rings i would do pistons and rings if you got it apart
but thats just me

 

[noah45]

thanx, can't wait to get back into the water (40 degrees)

From what I hear, I'm lucky more damage didn't happen (seals/shattered piston,etc...)

Funny thing is it runs OK @ 90lbs.

Once a 2stroke ingests water, does it automatically mean a rebuild?

 

[Mark44]

k

thanx, can't wait to get back into the water (40 degrees)

From what I hear, I'm lucky more damage didn't happen (seals/shattered piston,etc...)

Funny thing is it runs OK @ 90lbs.

Once a 2stroke ingests water, does it automatically mean a rebuild?

Nope.

Mark44

 

[aqua]

you probably dont want to run it much if the cylinders are off more than 10 from each other.

 

[tor*p*do]

Funny thing is it runs OK @ 90lbs.

get another compression gauge and check it.
You may just have a bad gauge . . . . .
And if it runs OK- run her 'til she blows!!!!:Banane01:

 

[Matt_E]

You'll want to disassemble it and inspect the crank. Rods might be bent due to water ingestion, causing low compression (due to reduced stroke).