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  1. #1
    xplayer2885's Avatar
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    po off finally set properly :)

    Finally my pop off is set properly. Im not sure what the pop off exactly does could some one explain? Does too high pop off cause for a lean condition?


  2. #2
    PolarisNut's Avatar
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    Quote Originally Posted by xplayer2885 View Post
    Finally my pop off is set properly. Im not sure what the pop off exactly does could some one explain? Does too high pop off cause for a lean condition?
    Yes, too high of a pop off can create a lean condition at low throttle openings. I believe that there is an explanation of the operation of the SBN carbs in the tech section...should be able to find everything you wanted to know in there.

  3. #3
    seaobin's Avatar
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    The pop-off pressure is the pressure at which the needle valve will open thus letting the fuel to enter the metering chamber. The value of this pressure is a function of the engine, power output and other factors and it will directly affect the air-fuel mixture that the carburetor will deliver to the engine. It is true that the mixture adjustments are done by the HI and LO screws but if the pop-off pressure is too high, it can lead to fuel starvation especially at high RPM. Such a situation will cause engine overheating and possibly lead to a seizure.If the pop-off pressure is too low, the carburetor will have a flooding tendency especially at low and mid RPM. It will also cause difficulties in restarting a warm engine.

  4. #4
    seaobin's Avatar
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    http://www.aerocorsair.com/id28.htm

    Actually from a airplane site, but a carb is a carb. priciple is the same. luckily, we dont fall from the ski when we kill our engines

  5. #5
    xplayer2885's Avatar
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    Well that explains my lean seziure. Its a good thing were not working on planes, cuz most of us wouldnt be hear! lol

  6. #6
    PolarisNut's Avatar
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    Quote Originally Posted by xplayer2885 View Post
    Well that explains my lean seziure. Its a good thing were not working on planes, cuz most of us wouldnt be hear! lol
    Well, very rarely does a 2 stroke seize at very low throttle input...there just isn't enough heat/load to do it. What were you doing when it locked up?

  7. #7
    xplayer2885's Avatar
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    Quote Originally Posted by PolarisNut View Post
    Well, very rarely does a 2 stroke seize at very low throttle input...there just isn't enough heat/load to do it. What were you doing when it locked up?
    The person riding it at the time which wasnt me. Was going WOT in a foot of water

  8. #8
    seaobin's Avatar
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    Check you cooling lines, he might have sucked some crap in as well

  9. #9
    xplayer2885's Avatar
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    I checked the cooling lines back on the fall when i winterized it. The female riding it told me there was crap floating in the water, bags, kelp etc. I also no longer to to this female.lol

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