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  1. #1
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    SL650 with 750 carbs jetting?

    I just rebuilt a '95 SL650 for a friend. Now I'm going through the carbs and fuel lines to make sure there will be no more problems. Aside from the hull being filthy inside and almost impossible to clean out thanks to all the ribbing, it's gone well until now. I cracked open the carbs tonight. They had factory blue paint never chipped, it chipped here and there as I started removing screws. Apparently these came off a 750 at some point as they have 95 mains and 75 pilots. Obviously it will run like this as he has ridden it for 2 years. My question is do I set these at 750 screw settings or lean out the highs 1/4 turn?? It also had the outside corners of all three upper reeds chipped. Any ideas why or would this be just fatigue from age?


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    Quote Originally Posted by Myself View Post
    I just rebuilt a '95 SL650 for a friend. Now I'm going through the carbs and fuel lines to make sure there will be no more problems. Aside from the hull being filthy inside and almost impossible to clean out thanks to all the ribbing, it's gone well until now. I cracked open the carbs tonight. They had factory blue paint never chipped, it chipped here and there as I started removing screws. Apparently these came off a 750 at some point as they have 95 mains and 75 pilots. Obviously it will run like this as he has ridden it for 2 years. My question is do I set these at 750 screw settings or lean out the highs 1/4 turn?? It also had the outside corners of all three upper reeds chipped. Any ideas why or would this be just fatigue from age?
    All of the 750 carbs I have opened up have been 90 highs...... Why lean out the screws if the ski is running well? More importantly, what does the piston wash look like?

  3. #3
    Myself's Avatar
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    I always thought the thing was a turd, never seemed to pull high rpm's. Burnt down lean on the PTO, already has triple pump. Was guessing dirty carbs but they're clean. Going to pull the fuel tubes out of the tank tonight. Might have been the rear crank seal as it didn't look too good.

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    BlueFishCrisis's Avatar
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    I agree, probably the rear seals... Does it have the restrictor installed?

    I had a 650 in that I had to up the jets to get it to run right. Let the owner know that the crank seals are probably starting to leak.....

  5. #5
    Myself's Avatar
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    I don't believe there is any restrictor.

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    Quote Originally Posted by Myself View Post
    I don't believe there is any restrictor.
    Wouldn't hurt to add one....

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    Quote Originally Posted by BlueFishCrisis View Post
    I agree, probably the rear seals... Does it have the restrictor installed?

    I had a 650 in that I had to up the jets to get it to run right. Let the owner know that the crank seals are probably starting to leak.....
    I had to go up a size on the low speed jets on my 650. Ran great after that

  8. #8
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    Found restrictor in return line which was blocked. Could not blow through it. It is equivelant to a #45 jet. Fired it up this evening and fuel pump is pumping great. After about 25 seconds on the trailer the rear cylinder is noticeably hotter to the tough than the others. Should I be checking into this??

  9. #9
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by Myself View Post
    Found restrictor in return line which was blocked. Could not blow through it. It is equivelant to a #45 jet. Fired it up this evening and fuel pump is pumping great. After about 25 seconds on the trailer the rear cylinder is noticeably hotter to the tough than the others. Should I be checking into this??
    Is this with or without garden hose water cooling?

  10. #10
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    This was without any cooling just to prime fuel, fire off, set idle speed, and check for exhaust leaks. I will haul it to the water to dial in carbs and start break in while watching plug color.

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