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  1. #1
    Happily Self-Employed WFO's Avatar
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    Another 4K limit problem 94SLT 750

    94 SLT 750 Fuji

    No matter what I do the engine goes to 4000 and just stays there. 4010, 4020, maybe 4030 rpms. Last time out the exh manifold and cyls felt cool, but the pipe and waterbox felt real hot. Boggs a little out the hole, but not always. Played with the carb screws a bit, but no help.

    Sat for a few years. Fuel was old and nasty. Also the little round instrument cluster is all F'd up... cant read it.

    -Got a set of rebuilt carbs and fuel pump upgrade from Zig
    -restrictor installed
    -fresh plugs, but after running a few minutes they are all dark looking
    -compression 135 across
    -stuck my fingers in the ports while the carbs were off and reeds "feel" good
    -replace external fuel lines
    -replaced sender fuel lines and re-attached the clunks
    -re-attached the fuel sender float while in the tank
    -by-passed the fuel selector (no fuel feed)
    -noticed the tank sender cap was cracked and rigged it up with 100mph tape
    -pulled the fitting out of the pipe and cut the clogged water screen off
    -dis-connected the manifold sensor
    -removed the thermostat
    -dis-connected the water temp sensor


  2. #2
    Moderator beerdart's Avatar
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    Have you checked the pump bearings and wearring. They are known to swell. Does the CDI have a gray wire??

  3. #3
    Happily Self-Employed WFO's Avatar
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    Quote Originally Posted by beerdart View Post
    Have you checked the pump bearings and wearring. They are known to swell. Does the CDI have a gray wire??
    eyeballed the prop and liner... prop is a bit mangled, but there is some gap btween the liner

    havent pulled the pump to check the bearings

    no gray wire that I can see

  4. #4
    SPEED KILLS, BUT YOU GET THERE QUICKER Keddano's Avatar
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    Still being a PIA for you. Just for the hell'va it,could you have a mouse nest built in the waterbox or exhaust? Check for spark with the cheap in line plastic testers running in the water on the trailer. I have had coils that fire fine out of the water with no load,but break down under load.

  5. #5
    Moderator beerdart's Avatar
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    Cool on the gray wire just checking if someone put a different CDI in that had limp mode. The gray wire is for limp on the later CDI's..

  6. #6
    Happily Self-Employed WFO's Avatar
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    Quote Originally Posted by Keddano View Post
    Still being a PIA for you. Just for the hell'va it,could you have a mouse nest built in the waterbox or exhaust? Check for spark with the cheap in line plastic testers running in the water on the trailer. I have had coils that fire fine out of the water with no load,but break down under load.
    yeah, 3 times to the water and still nothing...

    got some spark testers

    could be a nest in there I guess... also no flush hose on this thing so I cant run it out of the water to see water exiting

    wierd... doesnt really feel like its missing, just hits a wall

  7. #7
    Happily Self-Employed WFO's Avatar
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    Quote Originally Posted by beerdart View Post
    Cool on the gray wire just checking if someone put a different CDI in that had limp mode. The gray wire is for limp on the later CDI's..
    yeah Randy told me to check that and I couldnt find one... couple of brown wires to the temp switches but still no go

  8. #8
    SPEED KILLS, BUT YOU GET THERE QUICKER Keddano's Avatar
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    Sorta sounds like back pressure,you can pick up a garden hose adapter and screw it right into the water log. I have a plastic right angle one I use. Check the hose going to the waterbox,I have seem them seperate and the inside layer will colapze

  9. #9
    Moderator beerdart's Avatar
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    You could make a flush hose it installs on the water bar next to the temp sensor. The flush is designed to back flow the system. Or you could pull the water line from the pump and add a fitting to flow in the normal direction.

  10. #10
    Happily Self-Employed WFO's Avatar
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    Quote Originally Posted by Keddano View Post
    Sorta sounds like back pressure,you can pick up a garden hose adapter and screw it right into the water log. I have a plastic right angle one I use.
    ooohhh

    yes there is a plug in the log opposite the temp sensor

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