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  1. #1
    rustyrider's Avatar
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    can running low on fuel cause piston damage?

    Just wondering if running you ski low on fuel could hinder the fuel supply enough to cause piston damage? I was riding my 780 back to the ramp the other day with an almost empty tank and when i checked the wash it was really lean on the mag and pto cyls. Just wondering if this could have anything to do with it?


  2. #2
    Lake Mead Bum & BTLS Mark starflight's Avatar
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    My buddy Robert aka la90043 forgot to switch to reserve after running low on gas and he blew a cylinder on the way to fill up.

  3. #3
    Click avatar for tech links/info, donation request K447's Avatar
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    If the fuel pump starts sucking air bubbles into the fuel system from a low fuel tank level, it can lean out the carbs.

    As soon as you suspect the fuel level is getting borderline, switch to Reserve, and go back for more fuel. And ride smoothly, to minimize the sloshing of the fuel away from the fuel pick-up in the tank.

  4. #4
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    It is possible.

    I'd fatten them carbs up a bit until you know for sure, THAT was the cause.

  5. #5
    rustyrider's Avatar
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    The carbs are really rich! ever since the rebuild i have been paranoid so i made them super rich and am SLOWLY leaning them out. I just realized that the chain that holds the gas cap to the filler neck is missing and probably somewhere in my tank. I doubt it could get sucked up by the sender but im gonna pull the sender out and see if i can fish it out with a magnet or something. I think im just being really paranoid tho. everytime i hear the motor cough just a little i stop and pull the plugs and check the wash.

  6. #6
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    I understand your paranoia.

    You say they are set really rich. What are we talking?

    What mods are done to the ski?

    Are your pistons oversized since the rebuild?

    Did you install a different impeller?

    All of these can add to the fuel requirements needed. So what you may think is really rich, may just be what it needs.....

  7. #7
    rustyrider's Avatar
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    Lost track of the actual turns just from messin with it so much but i could find out tomorrow. probably around 2 for one of the cyls and around 1 1/4 -1 1/2 for the others which I would think is pretty fat. The ski is bone stock engine and pump wise. All the cyls are standard bore also. I would feel alot better if i could get it to run right with stock carb settings but that would just be way to lean. No airleaks either. all new lines, came stock with a trip fuel pump, cleaned carbs but no new seats or anything. checked all the vents, fuel sender, restrictor, new on off switch....... It just seems like its struggling fuel wise. I would love to be able to make it REALLY rich but it seems like i can only get enough fuel to make it safe but none to spare. I can make the cen cyl as rich as i want but the pto and mag seem to b starving a little. Carbs maybe?

  8. #8
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Maybe the adjustment needle O rings are leaking air.

    Did you rebuild the carbs, or just give them a good cleaning?

  9. #9
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    96 SL 780 carb adjustments:

    Hi speed: Mag= 3/4 CEN= 3/4 PTO= 1

    Low speed: 5/8

    Those are turns OUT from a lightly seated position

  10. #10
    rustyrider's Avatar
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    im cheap so i just gave them a cleaning and once over. I really dont want to spend 60 a carb if i really dont have too. college student budget doesnt leave much left over for the ski... I still need to check the fuel pressure but if thats good it has to be the carbs. then again if the center carb is good its gotta be something in the carbs i guess....

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