650sx bogging on take off
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  1. #1
    PWCToday Newbie
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    650sx bogging on take off

    I have a 87 650sx with duel cooling full aftermarket exhaust and 44mm mikuni. It starts fine every time but when I go to take off it bogs for about 15-30 seconds before it shoots off like a rocket. It runs good as long as I am halling tail but when I slow down its starts to bog again. It seems like too much water is running into the exhaust when it is not running. If any of yall could help me I would greatly appreciate it. Just bought this thing friday under the impression it ran like a top.

  2. #2
    Top Dog TOR*P*DO's Avatar
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    Re: 650sx bogging on take off

    it sound slike it is lean on the lower end.
    turn out the low speed screw 1/4 turn (first note how many complete turns you are at on the carb and record)
    and see if that improves it
    Get off the couch and Ride!!!!

  3. #3
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    Re: 650sx bogging on take off

    alrighty, I'll try it. Is there a certain temperature range these things like to run at? I've got a temp gun I use to tune my r/c cars with. I didn't know if that would work on skies too.

  4. #4
    Top Dog TOR*P*DO's Avatar
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    Re: 650sx bogging on take off

    not really and hard to measure combustion temp due to raw water cooling
    Get off the couch and Ride!!!!

  5. #5
    PWCToday Guru Hill858's Avatar
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    Re: 650sx bogging on take off

    You know it could be too much water running through waterbox. How are ur water lines runs?

  6. #6
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    Re: 650sx bogging on take off

    Ok, I took the ski to the test pond and set the carb to default settings and still bogged, tried leaning and richening the lowspeed all the way to 1/4 turn in each direction, still bogged. also messed with the high speed needle a little. no improvement. however i discoverd it runs better with the hood off, and the exhaust is dry piped. any ideas before I tear into the carb?
    Last edited by booski; 06-13-2011 at 08:38 PM.

  7. #7
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    Re: 650sx bogging on take off

    I rebuilt the carb and took the ski back out. It's still bogging on the low end. It seems to be loading up with fuel when I slow down. It runs better without the flame arrestor. please help.

  8. #8
    PWCToday Regular twalker8204's Avatar
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    I had a pretty bad exhaust leak recently and would choke it out and just bog like crazy. I would check to make sure your exhaust/couplers are all tight and that they aren't leaking. Even wrap in heat tape for now to make sure it isn't a leak

  9. #9
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    Re: 650sx bogging on take off

    I already checked for exhaust leaks. Whole exhaust system is sealed up tight.
    Thanks for the reply though. I am really starting to get bummed. Im going to try the ignition system next anybody have tips on checking the stators and what not?
    Last edited by booski; 06-20-2011 at 09:26 PM.

  10. #10
    PWCToday Regular alphamale3's Avatar
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    Re: 650sx bogging on take off

    Im not 100 % sure but I wouldnt think the electronics would have anything to do with your problem. But if it makes you feel any better my 650 is doing the same thing, did you ever figure it out?
    87 650 SX - Group K sleeper kit, 42mm Keihin carb, K&N filter, Mariner pipe, SS impeller re-pitched. Fully Restored.
    89 650 X2 - Coffman's water box, 42mm Keihin carb, K&N filter, Mariner head, Coffman's exhaust manifold, Coffman's pipe, SS impeller. Work in progress.

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