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Thread: My 2nd 750

  1. #1

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    My 2nd 750

    I posted earlier about buying a 95 SLT 750, and, I did, I bought it, $250 with a 1.5yr old SBT engine. This ski is CLEAN! I bought it knowing the mag piston was burnt, no biggie. So, today I pulled the head off and OMG this hole is HUGE and can see all the way to the top of the rod. I wanted to start a thread so I can ask questions as I tear down and rebuild the top end. I've noticed the fuel system has been updated, but in an oddball way! The owner has a premix and never adjusted the carbs for that and are at stock settings.
    .Click image for larger version. 

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ID:	367199 Mag cyl, that hole is HUGE!
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ID:	367200 A close up, you can see the rod, is that normal?
    Click image for larger version. 

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ID:	367201 The Highflow 62-702 is connected in an odd way. The bottom outlet goes the the PTO carb then the connects via T- connector to the return, leaving the MAG and CEN fed by one line then to a return line. I'm going to change that to the two midline Ts like my 93 750
    Click image for larger version. 

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ID:	367202
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ID:	367203 T connector for both the PTO and MAG return. Ummm, what?

    I'm currently looking at buying the complete gasket set from WSM and a new piston from WSM. This will be my first engine tear down. And if this goes well, I want to rebuild my 93. Oh, and CEN and PTO compression is 160. I'm going to redo the carbs, though they are 2 years old, along with replacing the fuel selector valve.


  2. #2
    Another failure mode to consider is the hoses inside the tank. I replaced mine last winter, they were in sad shape.

  3. #3
    BlueFishCrisis's Avatar
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    Quote Originally Posted by Octoarms View Post
    I posted earlier about buying a 95 SLT 750, and, I did, I bought it, $250 with a 1.5yr old SBT engine. This ski is CLEAN! I bought it knowing the mag piston was burnt, no biggie. So, today I pulled the head off and OMG this hole is HUGE and can see all the way to the top of the rod. I wanted to start a thread so I can ask questions as I tear down and rebuild the top end. I've noticed the fuel system has been updated, but in an oddball way! The owner has a premix and never adjusted the carbs for that and are at stock settings.
    .Click image for larger version. 

Name:	IMG_20150802_152751.jpg 
Views:	93 
Size:	115.7 KB 
ID:	367199 Mag cyl, that hole is HUGE!
    Click image for larger version. 

Name:	IMG_20150802_152757.jpg 
Views:	87 
Size:	125.0 KB 
ID:	367200 A close up, you can see the rod, is that normal?
    Click image for larger version. 

Name:	IMG_20150802_165202.jpg 
Views:	92 
Size:	76.4 KB 
ID:	367201 The Highflow 62-702 is connected in an odd way. The bottom outlet goes the the PTO carb then the connects via T- connector to the return, leaving the MAG and CEN fed by one line then to a return line. I'm going to change that to the two midline Ts like my 93 750
    Click image for larger version. 

Name:	IMG_20150802_165234.jpg 
Views:	88 
Size:	124.2 KB 
ID:	367202
    Click image for larger version. 

Name:	IMG_20150802_165254.jpg 
Views:	92 
Size:	70.5 KB 
ID:	367203 T connector for both the PTO and MAG return. Ummm, what?

    I'm currently looking at buying the complete gasket set from WSM and a new piston from WSM. This will be my first engine tear down. And if this goes well, I want to rebuild my 93. Oh, and CEN and PTO compression is 160. I'm going to redo the carbs, though they are 2 years old, along with replacing the fuel selector valve.
    160 is really high for a Fuji. This may contribute to a lean burn especially combined with switching to premix and not changing the carb settings.....

  4. #4

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    Quote Originally Posted by BlueFishCrisis View Post
    Quote Originally Posted by Octoarms View Post
    I posted earlier about buying a 95 SLT 750, and, I did, I bought it, $250 with a 1.5yr old SBT engine. This ski is CLEAN! I bought it knowing the mag piston was burnt, no biggie. So, today I pulled the head off and OMG this hole is HUGE and can see all the way to the top of the rod. I wanted to start a thread so I can ask questions as I tear down and rebuild the top end. I've noticed the fuel system has been updated, but in an oddball way! The owner has a premix and never adjusted the carbs for that and are at stock settings.
    .Click image for larger version. 

Name:	IMG_20150802_152751.jpg 
Views:	93 
Size:	115.7 KB 
ID:	367199 Mag cyl, that hole is HUGE!
    Click image for larger version. 

Name:	IMG_20150802_152757.jpg 
Views:	87 
Size:	125.0 KB 
ID:	367200 A close up, you can see the rod, is that normal?
    Click image for larger version. 

Name:	IMG_20150802_165202.jpg 
Views:	92 
Size:	76.4 KB 
ID:	367201 The Highflow 62-702 is connected in an odd way. The bottom outlet goes the the PTO carb then the connects via T- connector to the return, leaving the MAG and CEN fed by one line then to a return line. I'm going to change that to the two midline Ts like my 93 750
    Click image for larger version. 

Name:	IMG_20150802_165234.jpg 
Views:	88 
Size:	124.2 KB 
ID:	367202
    Click image for larger version. 

Name:	IMG_20150802_165254.jpg 
Views:	92 
Size:	70.5 KB 
ID:	367203 T connector for both the PTO and MAG return. Ummm, what?

    I'm currently looking at buying the complete gasket set from WSM and a new piston from WSM. This will be my first engine tear down. And if this goes well, I want to rebuild my 93. Oh, and CEN and PTO compression is 160. I'm going to redo the carbs, though they are 2 years old, along with replacing the fuel selector valve.
    160 is really high for a Fuji. This may contribute to a lean burn especially combined with switching to premix and not changing the carb settings.....

    I thought 160 for a 750 was high. That being said, wouldn't I need to run about 89 octane? Also, I cannot seem to find a bolt pattern for removing the exhaust pipe and the intake (bolts by the block) along with the torque specs. Since I'll be pulling the jug out, I've read about performance "reeds"? Is that something I should look into?

  5. #5

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    I faced palmed the other night. I pulled the carbs off, about 35 mins, I'm getting better at it :P. I was inspecting this fuel system setup, and couldn't believe what I saw. First off, the fuel line from the select valve to the fuel pump the part where the clamp is, was all fiber, no rubber. Going on down the line, the line that goes to the CEN and connects to the MAG (using the stock setup) were tempos, then, the lines that connect the carbs for fuel return, all tempo. Someone half assed this fuel line replacement! I think there is a line leak too, I saw wet spots around the mag carb, and only the mag. So time to tear down and check them out. I'm also thinking about taking the heads off the Cent and PTO and read their wash patterns.

  6. #6

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    I'm back! It's cool'd off here, no longer 100+ so I tore down the top end on the MAG, ummmm, when the cly comes off, are the rings supposed to pop out? My rings are totally shot too, I can't put the jug back on cause the rings. I'm using towels to keep crap out!



    You can see the two pics I have here on what I'm talking about. I checked the jug, I see no scratches.

  7. #7
    Appologizes for the last user title katz1002's Avatar
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    rings come uncompressed like that to be able to get them on and off those look normal they have to be squeezed together then they fit tightly in the bore. no real reason to put the jug back on you need to replace both piston and rings anyway. the towels will work fine for now. Do you have a micrometer to check if the jug is within spec?
    Click image for larger version. 

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