- Location
- knoxville tn
Just purchased a 1994 750 sx
New to the site and to stand ups. Engineer and mechanic but clueless on these small two strokes. I just bought this ski from a good buddy who had just bought it from some one a few months back who had also just purchased it. Some where along the way some one spent some money. Long story short I don't know what mods have been done to this thing. I'm trying to figure out exactly what I have and what I need to do. It has a new engine and I don't think it was really ridden much after it was all put together. Hour meter said 15 hours when I got it. I was told it had stock carb all stock internals but it has a Mikuni carb. I had to have some work done to my Coffman manifold with the help of the guys on this site. Below are the mods I know it has.
Coffman manifold with coffman speed pipe ( I think is what its called).
Looks like an aftermarket intake manifold, with an adapter, and mikuni carb.
It has an intake grate and extended ride plate.
Rear sponsons and im not sure what all is done in that regard.
Blowsion handle bars and pipes and everything.
I just ordered a tdr water box that gets here today. It still had stock water box. It already has the water box bypass set up.
The ski seems to run perfect. On a hot start after it was shut off, like if I was riding it hard then shut it off and let it sit for a min or two and restart it. It will stumble for 2 or 3 seconds in the mid range as your first take off but then it clears right up and takes off and you cant make it do it again unless you shut it off. Seems like it will idle for days with no prob. I have to get through a big no wake zone whenever I take it out. So im not really trying to change the setup much or reinvent the wheel I just want to make sure I at least have a correct set up and am not leaving a bunch of power on the table some where.
I should have it running again tomorrow at which time I will adjust the low and high end of the carb and see where they are set. I plan on pulling the carb apart after I ride this weekend to see what jets are in it. I'm apprehensive to do this because it runs so good but I'm being told I need to make sure the jets match the pipe and water box and what not. To check which carb model it is I just need to measure the diameter of the throat right? For the record the water I ride on is 815' above sea level.
I checked compression and had about 165 front and back on a cold engine so I guess that means I prob have stock compression?
How do I check if I have timing mods. I have a nice digital light but again am unfamiliar with these little things. I assume you can pull one of these little plugs to view the flywheel? What is factory base timing? Or is there a way to tell visually if someone has done one of these timing advance kits I see on here. If it had some kind of MSD enhancer or timing box that would be visible in the E box right?
How can I check what impeller and jet I have? They look aftermarket to me. Are specs stamped on the blades anywhere usually that I could see with a scope or something?
I am exited to hear yalls opinions but assuming its jetted correctly, I plan on adding a timing mod if I don't already have one, ensuring I have a good low end performance jet/impeller, a good light weight flywheel, and leave it at that.
is there anything else yall recommend I so right off the bat?
Thanks for your help.
New to the site and to stand ups. Engineer and mechanic but clueless on these small two strokes. I just bought this ski from a good buddy who had just bought it from some one a few months back who had also just purchased it. Some where along the way some one spent some money. Long story short I don't know what mods have been done to this thing. I'm trying to figure out exactly what I have and what I need to do. It has a new engine and I don't think it was really ridden much after it was all put together. Hour meter said 15 hours when I got it. I was told it had stock carb all stock internals but it has a Mikuni carb. I had to have some work done to my Coffman manifold with the help of the guys on this site. Below are the mods I know it has.
Coffman manifold with coffman speed pipe ( I think is what its called).
Looks like an aftermarket intake manifold, with an adapter, and mikuni carb.
It has an intake grate and extended ride plate.
Rear sponsons and im not sure what all is done in that regard.
Blowsion handle bars and pipes and everything.
I just ordered a tdr water box that gets here today. It still had stock water box. It already has the water box bypass set up.
The ski seems to run perfect. On a hot start after it was shut off, like if I was riding it hard then shut it off and let it sit for a min or two and restart it. It will stumble for 2 or 3 seconds in the mid range as your first take off but then it clears right up and takes off and you cant make it do it again unless you shut it off. Seems like it will idle for days with no prob. I have to get through a big no wake zone whenever I take it out. So im not really trying to change the setup much or reinvent the wheel I just want to make sure I at least have a correct set up and am not leaving a bunch of power on the table some where.
I should have it running again tomorrow at which time I will adjust the low and high end of the carb and see where they are set. I plan on pulling the carb apart after I ride this weekend to see what jets are in it. I'm apprehensive to do this because it runs so good but I'm being told I need to make sure the jets match the pipe and water box and what not. To check which carb model it is I just need to measure the diameter of the throat right? For the record the water I ride on is 815' above sea level.
I checked compression and had about 165 front and back on a cold engine so I guess that means I prob have stock compression?
How do I check if I have timing mods. I have a nice digital light but again am unfamiliar with these little things. I assume you can pull one of these little plugs to view the flywheel? What is factory base timing? Or is there a way to tell visually if someone has done one of these timing advance kits I see on here. If it had some kind of MSD enhancer or timing box that would be visible in the E box right?
How can I check what impeller and jet I have? They look aftermarket to me. Are specs stamped on the blades anywhere usually that I could see with a scope or something?
I am exited to hear yalls opinions but assuming its jetted correctly, I plan on adding a timing mod if I don't already have one, ensuring I have a good low end performance jet/impeller, a good light weight flywheel, and leave it at that.
is there anything else yall recommend I so right off the bat?
Thanks for your help.
