Super Jet HELP: Excessive Wear in Sleeves

[LegDragger64]

You need a dial bore guage to measure cylinder . Those pistons are smaller at the top due to expansion when warmed up . Thats why they rock in the bore . Get a micrometer and measure the skirt . There is your clearance .

 

[DAG]

water can get into the cyl where the sleeve and the casting meet at the ports.

Is there anyway to test this? Everything visually looks ok with the jugs and sleeve alignment. doing the heat cycles and pulling the head every 60 seconds of run time there was no evidence of water droplets.

Sleeve install is not something I would trust an automotive shop with. Even for boring, I use a special shop that knows two-strokes.
And on a motor like that? No f'n way some local yokel shop is touching that.
For my personal motors that cost more than your standard 701, I've always had the original builder do that kind of work. Yes, it's a pain to ship and costs more. But I know it's done right.

For your particular case, they could have screwed up the sleeve seating depth, leading to inevitable water intrusion into one or both cylinders - which can cause the exact wear that you are seeing.

Agreed. unfortunately I was led on to believe NW Sleeve was putting the sleeves in. I guess that was ignorance on my end for not asking enough questions when someone says they will take care of it. Is there some way to measure the 'sleeve seating depth'? or visual indicators?

since you got cheap and went automotive shop , did you also get cheap and buy some wang chung aftermarket butter sleeves?

It was just cheaper to make my own. ended up cutting soda pop cans and welded them together to the sleeve thickness I needed and drimeled out the ports before press fitting to the jug with a sleg. I have the label side on the inside, maybe I should have put the shiny side on the inside. mybad

 

[norcaljetski]

i dont think you will be able to visually see water droplets. even a very small amount of water ingestion (non visible) when running will cause "piston wash" and looks very similar to what you are showing. Even the smallest amounts of water ingestion can cause very weird effects on an engine. I was dealing with a nightmare motor about a year ago where it had the symptoms of hitting a rev limiter at 3000 rpms and chased what i thought was an electrical gremlin for months and finally it came down to a very small leak in the head oring that sealed the water jacked from the cylinder. I checked the plugs for water signs and came up with nothing but as soon as a replaced orings and sealed the head properly, the problem stopped. Alot of times these motors will pull water through a small leak (torn gasket, worn o-ring, cracked cylinder, bad sleeve alignment) only at high RPMs so by the time the motor settles down to lower RPMs (IDLE) the leak has stopped and the motor has burned off the water well before you shut the motor down and inspect for symptoms of water ingestion. this was the exact reason as to why my motor ran poorly at higher RPMs but idled fine and showed no signs of water ingestion. just my $0.02.

 

[Little Trumps Super Jet]

It was just cheaper to make my own. ended up cutting soda pop cans and welded them together to the sleeve thickness I needed and drimeled out the ports before press fitting to the jug with a sleg. I have the label side on the inside, maybe I should have put the shiny side on the inside. mybad[/QUOTE]
Lmao this made my day! lol