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  1. #1

    Lightbulb General Question

    Hello Everyone i am new to this forum i have some general questions open for discussion if anyone could possibly lead me in the right way, first off i have a 97gp1200 upgraded pistons,true and welded crank,2 stage reeds, aftermarket heads with 42cc domes for 93 octane,14/19 solos impeller, side draft manifold jetted carbs. only it doesnt have is novi carbs,triples,skat pump but its got almost everything else.

    Problem at hand over the last year at WOT it would have a slight break up only turning 6900RPM's. The ski was previously my brothers he says the carbs are not in sync thats why if runs like shit. So i am leading to believe that was the issue with that.

    About two months ago i got my hand on a riva rev high purple CDI when i installed it the ski ran worse then before so i took it back out and replaced it with the factory computer and it ran about the same as before.

    Now to current date i have all mods listed up top with factory CDI and new Side draft when i drove it when i would smash the throttle it would fall on its face im leading to the carbs not being adjusted right.

    I hope someone on here can give me some further advice PLEASE .

    Thanks Everyone


  2. #2
    Moderator beerdart's Avatar
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    Welcome to the hulk..

    I would have to say carb tuning..
    http://www.greenhulk.net/forums/showthread.php?t=15473

  3. #3
    Quote Originally Posted by beerdart View Post
    Welcome to the hulk..

    I would have to say carb tuning..
    http://www.greenhulk.net/forums/showthread.php?t=15473
    Thanks appreciate the help willing to take all advice

  4. #4
    Moderator beerdart's Avatar
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    Tuning Tips for Girls
    THANKS RANDY!!!

    Start with the screws set at 1 turn out, and tune with the tachometer for peak Rpm, then stop there and count the number of turns on the high speed screws. Write this down on a piece of paper.. Then turn the high speed screws in all the way and open them to 1/4 turn open. (Now you will be testing starts only, so no more big high rpm trips around the course). You are only turning in the high speeds to allow you to easily tune the low speeds.

    Now check the low speed screws and set them at 1 turn and do a practice start; To test the low speed setting pretend that you just jumped the start and you have to start with no holder. Hold the ski by yourself and hold as many Rpm as you can (don't blow it out first for testing) and then nail the throttle hard.... NO FARTHER THAN 50 FEET, as you are only testing the start response

    If it blubbers like a schoolgirl trying to guzzle a quart of beer, then it's too rich on the low speed screws..
    If it falls flat on the line (like someone punched you in the stomach).. It's too lean on the low speed screws.

    When you like the acceleration off the line, stop there and count the number of turns on the low speed screws. Write this down on a piece of paper.. Then re-set your high speed screw where they show the best peak Rpm earlier and try both a start and a peak Rpm run...
    It will probably "blubber" a little off the line... DO NOT turn in the low speed screws... Instead, go back out on the course and fine tune for peak Rpm again.. The blubbering off the line is caused by having too much fuel in the high speed circuit... Write down your new high speed setting on the piece of paper along with the best low speed setting that you found earlier, this will be your base-line carburetor settings.
    If the high or low speed screws are open more than 11/4 turns, then you need to swap to the next bigger jet.
    If the high or low speed screws are closed all the way, then you need to change to the next size smaller jet.


    *** If no matter what you try, it still won’t leave the line without falling on its face "lean bog"... Then try the next size lower pop-off spring in the carbs... Don't be afraid to try #95 or even #80 gram springs..
    __________________

  5. #5
    well before the carbs were set up for 150psi and different jettings in the carbs do you think the side draft manifold i might need to change the setting in the carbs

  6. #6
    Quote Originally Posted by beerdart View Post
    Tuning Tips for Girls
    THANKS RANDY!!!

    Start with the screws set at 1 turn out, and tune with the tachometer for peak Rpm, then stop there and count the number of turns on the high speed screws. Write this down on a piece of paper.. Then turn the high speed screws in all the way and open them to 1/4 turn open. (Now you will be testing starts only, so no more big high rpm trips around the course). You are only turning in the high speeds to allow you to easily tune the low speeds.

    Now check the low speed screws and set them at 1 turn and do a practice start; To test the low speed setting pretend that you just jumped the start and you have to start with no holder. Hold the ski by yourself and hold as many Rpm as you can (don't blow it out first for testing) and then nail the throttle hard.... NO FARTHER THAN 50 FEET, as you are only testing the start response

    If it blubbers like a schoolgirl trying to guzzle a quart of beer, then it's too rich on the low speed screws..
    If it falls flat on the line (like someone punched you in the stomach).. It's too lean on the low speed screws.

    When you like the acceleration off the line, stop there and count the number of turns on the low speed screws. Write this down on a piece of paper.. Then re-set your high speed screw where they show the best peak Rpm earlier and try both a start and a peak Rpm run...
    It will probably "blubber" a little off the line... DO NOT turn in the low speed screws... Instead, go back out on the course and fine tune for peak Rpm again.. The blubbering off the line is caused by having too much fuel in the high speed circuit... Write down your new high speed setting on the piece of paper along with the best low speed setting that you found earlier, this will be your base-line carburetor settings.
    If the high or low speed screws are open more than 11/4 turns, then you need to swap to the next bigger jet.
    If the high or low speed screws are closed all the way, then you need to change to the next size smaller jet.


    *** If no matter what you try, it still won’t leave the line without falling on its face "lean bog"... Then try the next size lower pop-off spring in the carbs... Don't be afraid to try #95 or even #80 gram springs..
    __________________
    my brother is then one who is doing the tuning his is a car mechanic i know a wave runner mechanic is two different world but he is very knowledgeable with this stuff do you think tuning should be done by a professional or if i take my time it could be done myself ???

  7. #7
    Moderator beerdart's Avatar
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    Quote Originally Posted by 97gp1200 View Post
    my brother is then one who is doing the tuning his is a car mechanic i know a wave runner mechanic is two different world but he is very knowledgeable with this stuff do you think tuning should be done by a professional or if i take my time it could be done myself ???
    The guide I posted is just a guide for all 2-strokes.

    I would get some pointers from him. Tuning is not that hard if you can read the signs of a good running engine ie: piston wash and spark plug reading.

  8. #8
    Quote Originally Posted by beerdart View Post
    The guide I posted is just a guide for all 2-strokes.

    I would get some pointers from him. Tuning is not that hard if you can read the signs of a good running engine ie: piston wash and spark plug reading.

    Thanks for the tips appreciate it

  9. #9
    Waveblaster785's Avatar
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    I'll sell you the triples you are missing

  10. #10
    Quote Originally Posted by Waveblaster785 View Post
    I'll sell you the triples you are missing
    How much might be a possibilities

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