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View Full Version : What caused this? Piston failure


X-Runner
06-28-2009, 10:19 AM
This is a Jet Ski engine (900cc 3 cylinder 2 stroke). What caused this piston failure? The head on this cylinder also looks almost like the top of the piston.

http://i185.photobucket.com/albums/x307/tech_guy/IMG00124.jpg
green91
06-28-2009, 10:21 AM
Lean. Probably a jetting or sp plug issue.
X-Runner
06-28-2009, 10:25 AM
My thoughts exactly. Thanks.
blackshine007
06-28-2009, 10:26 AM
Is it boosted? Look like you leaned out.
X-Runner
06-28-2009, 10:28 AM
No its not. I'm thinking a carb gasket started leaking or something. Has less than 100 hours on the engine. All stock.
Barefoot
06-28-2009, 12:18 PM
lean all day
eraser4g63
06-28-2009, 07:35 PM
Lean, or your Pre mix was WAY off.
Tech5
06-28-2009, 08:30 PM
110% lean
X-Runner
06-28-2009, 11:19 PM
Lean, or your Pre mix was WAY off.

Its injected.
NevrNufTorq
06-28-2009, 11:41 PM
then the injector wasnt working properly or someone 'adjusted' your carbs and then one of your buddues decided to 'floor it' for say 20-30 min and that's what happens :( sorry, happened to me back in the day too
X-Runner
06-29-2009, 09:54 AM
So... how do you go about adjusting the carbs? It has 3 of them.
Tech5
06-29-2009, 10:09 AM
sync and re jet
sikfricks
06-29-2009, 10:37 AM
2 stroke jet skis are really sensitive i would never trust the injection just premix the gas this has happened to me numerous of times i learned the hard way p.s buy my jet ski
X-Runner
06-29-2009, 10:39 AM
You can't remove the injection system on this ski but I am going to premix the gas 50:1 anyways along with the oil system. Thats what Kawasaki recommended.
X-Runner
06-29-2009, 10:48 AM
2 stroke jet skis are really sensitive i would never trust the injection just premix the gas this has happened to me numerous of times i learned the hard way p.s buy my jet ski

Check your PMs.