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  1. #1

    93 sl750 piston wash

    they said i need to richen up the high speed needle, witch one is it??? The manual dont show..


  2. #2
    ph2ocraft's Avatar
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    Who's they and do you have a photo.
    In the tech section, there is a Mikuni rebuild procedure and it shows locations of the high speed screws (upper ones).

  3. #3
    here is a pic
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  4. #4
    ph2ocraft's Avatar
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    93 SL750.
    GO through the fuel system!!
    If nothing has changed and you have not modded the boat you have a fuel restriction.
    Common Issues
    Fuel Selector Switch
    Fuel Lines Kinking and cutting off fuel supply
    Fuel Lines dropping into tank can be swollen shut or fallen off
    Plugged filters in carbs
    Plugged carbs due to fuel contamination

    Can you give us some history??

  5. #5
    i blew out the fuel selector switch
    Lines look good, i even pulled them out of the tank and checked them
    Carbs are all cleaned and new diaphrams installed
    That cylinder had the water leak i think when i was working on it i might of helped clean it a little more. I ran it yesterday it runs good and all spark plugs are brown colored. Do you have to take the head off to check piston wash or can you look thru the plug hole?

  6. #6
    you can use a led light and look thru the hole but of course you won't be able to post any pics . PS bump starter till piston is all the way down

  7. #7
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Quote Originally Posted by ZMANN View Post
    you can use a led light and look thru the hole but of course you won't be able to post any pics . PS bump starter till piston is all the way down
    Or you can remove the coupler cover and turn the crank by hand.

  8. #8
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Plug chops not accurate

    As I stated before, my plug chops lie to me. I wish I had a pic of the plugs but didn't take my camera.

    How can the PTO (far left) cylinder be so rich, and the plug not come out wet?

    The CEN cylinder, will come out wet when I turn the screws out 2 turns. It's actually the leanest of the 3.

    The MAG (far right) cylinder is also very rich, but again, the plug comes out lean. The wash runs around the entire slug, not just one side of it as it appears in the pic.

    I have been switching between BPR8ES and BR9ES plugs to get the best "READ". Pulled the heads and this is what I've got on "her ride".

    This is with the 92 octane heads, 95 780 CDI, and the PSI dry pipe. MAX operating RPM has been 6390, far less than what I was running last fall around 6700.
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