Ahhh man. :shrug: My father and I have been putting in a lot of time to making my 300sx run right and have finally come the conclusion that the engine needs to be rebuilt and bored. We took the pipe off tonight and saw the cylinder looks like complete crap. He said he can't believe it runs as good as it does and has seen engines NOT run with better looking pistons. The compression is 170psi still? How is that possible?
Monday I'll have a crank seal compression test kit because before we even took the pipe off he figured it has to be an air leak because you will tune the carb and reset the idle and the thing will sound and respond great and 20 minutes later you start it and it free revs or stalls when throttle is applied and you have to tune the carb all over WAY out from factory setting. The shop manual even says 2 strokes can get plagued by undiagnosable poor running which is usually a crank case seal leak.
So at this point neither of us wants to be beaten by this 25 year old jet ski.
We are deciding what to do now.
Option 1. Have GroupK bore the cylinder and have a stock looking boat that runs like a 550.
Option 2. Buy a 550 and stuff the guts in the 300.
Either way we will make it run and with the added power I'm gonna put a footstrap for the back foot and start hucking it around. He told me if we did a 550 conversion we are going to end up rebuilding that motor anyways because these things are old. We both think it would be cool to have a stock looking 300sx that can run with bigger skis.
We are both leaning towards the Groupk sleeper mod.
What do you guys think? Can't afford a superjet yet. That's next season. Plus I want 2 ski's so I can take the girl or a friend out with me.
Monday I'll have a crank seal compression test kit because before we even took the pipe off he figured it has to be an air leak because you will tune the carb and reset the idle and the thing will sound and respond great and 20 minutes later you start it and it free revs or stalls when throttle is applied and you have to tune the carb all over WAY out from factory setting. The shop manual even says 2 strokes can get plagued by undiagnosable poor running which is usually a crank case seal leak.
So at this point neither of us wants to be beaten by this 25 year old jet ski.
We are deciding what to do now.
Option 1. Have GroupK bore the cylinder and have a stock looking boat that runs like a 550.
Option 2. Buy a 550 and stuff the guts in the 300.
Either way we will make it run and with the added power I'm gonna put a footstrap for the back foot and start hucking it around. He told me if we did a 550 conversion we are going to end up rebuilding that motor anyways because these things are old. We both think it would be cool to have a stock looking 300sx that can run with bigger skis.
We are both leaning towards the Groupk sleeper mod.
What do you guys think? Can't afford a superjet yet. That's next season. Plus I want 2 ski's so I can take the girl or a friend out with me.
