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Thread: need some help

  1. #1

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    need some help

    hey guys i could use some help. my 93 750 is running very badly and i can't figure out what to do. when you give it gas it bogs out and will stall if you dont let off the gas. if you choke it out it will run great for a few seconds then it bogs out again. I have some video of what its doing so maybe you genius's can figure it out..
    I have rebuilt the carbs, upgraded to a triple fuel pump and replaced all fuel lines including the ones in the tank.







  2. #2
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    In the second video, did it change RPM after you removed the MAG plug wire? (didn't sound like it)

    When you crack the throttle and bog it out, remove the plugs and tell me if they're wet or dry.

    Basic Q's:

    Did you inspect the filters inside the carbs?

    Did you install the restrictor in the return hose?

    How do the carb diaphragms and needles/seats look?

    Have you tried clipping the plug wires back 1/4"?

    What's your compression reading?

  3. #3

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    Quote Originally Posted by xlint89 View Post
    In the second video, did it change RPM after you removed the MAG plug wire? (didn't sound like it) I don't notice a difference when i pull any plug wire except for the middle plug

    When you crack the throttle and bog it out, remove the plugs and tell me if they're wet or dry.front and back a little wet center was dry

    Basic Q's:

    Did you inspect the filters inside the carbs? all 3 were clean

    Did you install the restrictor in the return hose? that was the only line I didnt replace because i wasnt sure about the restrictor. I have read misleading info on here about if the 93's have restrictors or not.

    How do the carb diaphragms and needles/seats look?diaphrams were good needles looked ok to someone who has never messed with a carb before lol

    Have you tried clipping the plug wires back 1/4"? no i couldn't get the old boots off the wire do you twist them off or pull off? They all do have a nice blue spark from them.

    What's your compression reading? 120-125-120
    i will put it in the water tomorrow and get a little longer video. if you wanna come out here sometime and take a look at it I can give you some $$$ for gas im only about an hour away!

  4. #4
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Yeah, I thought I heard the RPM drop only after the CEN plug wire pulled.

    Plugs looking wet tells me they're rich.

    Is the choke fully disengaging? (open)

    Is fuel dripping out of the carbs when idling?

    Did you reset the carb adj settings to the specs for your year?

    Yeah, I saw you're out in Sandusky. Prob be better if you could head out my way. I have all my tools and spare parts here.

  5. #5

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    Quote Originally Posted by xlint89 View Post
    Yeah, I thought I heard the RPM drop only after the CEN plug wire pulled.

    Plugs looking wet tells me they're rich.

    Is the choke fully disengaging? (open)Yeah it returns to straight up/down

    Is fuel dripping out of the carbs when idling?not sure will check that today after work

    Did you reset the carb adj settings to the specs for your year? yeap 1/2 on the low speed and 7/8M 1/2C 5/8P on the high

    Yeah, I saw you're out in Sandusky. Prob be better if you could head out my way. I have all my tools and spare parts here.
    I would love to but I don't know if my trailer (or truck for that matter) would make it that far lol

    *edit I'm going to double check the high speeds I might have reversed the front and rear settings.

  6. #6
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    High speed screws are on the top with the lows being low on the carbs.

    Also make sure the carbs are dripping fuel at idle. (you'll need to remove the FA and look while running)

  7. #7

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    ok I had it in the water yesterday to test it some more. The PTO was the only one that had fuel dripping at idle....So how do I fix the CEN and MAG carbs to do the same?

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