My 750 is it a big pin or small pin

[Avery934]

One of my 750's came out of a 94 jh750 with the vin kaw20634h394 and my other 750 i'm not sure what year or vin but it came out of a ts 750. I have bigger pistions that have been givien to me how do tell what they fit??? And what i have....

 

[st.clair.jetski]

my 750 sx has a small pin ( 10 bolts on the intake manifold) my 750 sxi pro has a big pin (12 bolts on intake manifold)

 

[Motorheads5]

The way to tell the engines apart is a big pin has 12 intake manifold bolt's and a small pin has 10 intake bolt's ! The wristpin measurement is in any service manual I do not remember I will see if I can look it up.

 

[Avery934]

thanks guys i got both from the yamaha shop I just started and they dont know anything bout them got both for 400 and when I say both I got both skis complete for 400 they both turn over with a jump box so I was thinking they r both good

 

[madscientist]

nice score bro.

 

[Avery934]

nice score bro.

so I did a compression test and the front and back is almost 180 each it has a ocean pro head. should I do anything or just button it up and ride??? and should I change the pump or wait till winter?

 

[madscientist]

button it up and rock. but i would run dual cooling since the 750 had a 1/2" line on it. 2 in and 1 out will be fine

 

[Avery934]

button it up and rock. but i would run dual cooling since the 750 had a 1/2" line on it. 2 in and 1 out will be fine

can you send me a link to a forum so I can see how to do that?

 

[Motorheads5]

You are on it just study the x-2 section.

 

[madscientist]

real easy, your pump should have an extra boss on it. drill and tap w/ a 1/4" npt bit and tap. thread in a rt angle barb from the plumbing dept at lowes/ ect.

run hose from the new fitting to the stock pipe drain in the pump tunnel just above the stock cooling line. then drill and tap the lower side of the aft clyinder exhaust manifold w/ the same tap. thread in another fitting, run hose from the bilge side drain tube to the new fitting on the manifold.

call it done and go ride.

 

[Avery934]

You are on it just study the x-2 section.

Thanks for the help will do...:beerchug: hope to be in the water by wed.