Carby carb problems

Discussion in '2-Stroke Engines' started by metalzombievi, Sep 23, 2015.

  1. metalzombievi

    metalzombievi Member

    i bought one of those racing carbs and used it for small test rides, but while on what was suposed to be a long dostance ride, the fuel thing that rotates fell off. the screw fell out. i didnt have time to check if the gasket was still in it as i had to go somewhere.

    my question is, does it require the gasket. ill add a picture, the thing the fuel line hooks up to turns and thats where it failed. and where the gasket was.
    image.jpg
     

  2. jaguar

    jaguar Well-Known Member

    without the gasket the fuel will leak out
     
  3. Rolling2High

    Rolling2High Member

    If the screw was not all the way in it will fail. I had to glue mine cause when I modified the cable it was a little short.
     
  4. Rolling2High

    Rolling2High Member

    I have a opinion question a Delton for $60 on ebay or a Mikuni for $75 I want reliability plus performance without having to buy new jets. By the way other guy. Put in a 65 mm jet in the "racing carb" it works miracles. 4 more mph.
     
  5. metalzombievi

    metalzombievi Member

    i found a new screw that fit and stayed put, tried rideing around for a while with out the gasket, but haveing the thing screwed in as tight as i could by hand. i rode for 3-4 miles and there was no leaking or mivement at all. im still going to look into getting some gasket material to make my own. i had the original screw in pretty tight, but i guess it wasnt tight enough.
     
  6. jaguar

    jaguar Well-Known Member

    there is no getting around knowing how to jet a carb properly. Learn it or pay out your arsz for a mechanic to do it.
     
  7. jaguar

    jaguar Well-Known Member

    If tight screws are loosening then you have too much engine vibration and its time to balance your crank
     
  8. metalzombievi

    metalzombievi Member

    the screw comeing out was more due to stupidity than anything and ill admit that. i dont think it was ever that tight to begin with (first time i tried fireing up the motor some fuel came out because it wasnt tight enough and i just made it stay insted of realy tightening it) and i should have checked it but didnt give it a seccond thought. the carb has its own filter and before i put the new screw in, i looked and the round outer part of the filter and its covered by the thing that the fuel line hooke up to. (it might not make sence, sorry, but i dont know the actual names for the parts) i think the filter part might be acting as a gasket.
    but im still going to look for gasket material.
     
  9. Rolling2High

    Rolling2High Member

    You need this fuel resistant glue. It's bad ass. My carb was leaking from the bottom and when I changed jets the rubber ring was bent so my carb leaked and I used this let it dry a day and no leaks.the top gasket is very intracte . You can't cut one out
    Use the glue
    It's only $20 towards your first lesson.
     
  10. Rolling2High

    Rolling2High Member

    The filter is a filter. Not a gasket by the way.
     
  11. metalzombievi

    metalzombievi Member

    heres another question, since i put the new carb on, the motor has a harder time starting. i think its because the carb is new, but i dont know. if i just try to start it, it acts like it dosent get enough gas so i have to hold the throttle down while peddling for a little bit untill it gets going, than i can let it continue to warm up with the clutch in. but if i dont hold the throttle for a little bit it just bogs down and dies. is it because its a new carb or is something wrong? it was doing the same thing before the gasket went missing. and useing the choke makes it worse.
     
  12. jaguar

    jaguar Well-Known Member

    "hold the throttle down"?
    if choking it (ie: obstructing the intake) makes it worse then it is too rich.
    make sure the float is set to the correct level because if the fuel level in the bowl is too high then that would make it too rich.
    the trouble with those Dellorto SHA carbs is that they don't have an idle jet that you can change.
    also, if the air filter is too restrictive then that would make the mixture too rich. take off the filter and see how it runs.
     
  13. metalzombievi

    metalzombievi Member

    would you happen to have a link to somewhere that would explain how to check and adjust the float level? im learning as i go
     
  14. jaguar

    jaguar Well-Known Member

    take the float bowl off and hold the carb upside down.
    the float should be perpendicular to the mating surface of the bowl.
     
  15. crassius

    crassius Well-Known Member

    if it is NT style carb, turn it upside down and look at hole in float - main jet just peeking up thru hole is normal - leaner is main just barely hidden in hole, and richer is main sticking up a bit
     
  16. metalzombievi

    metalzombievi Member

    image.jpg
    hopefully that picture is there when i hit post. this is what i have when i took off the float bowl. its upside down. what should i adjust?
     
  17. metalzombievi

    metalzombievi Member

    can anyone tell me what to adjust? the brass looking part is as tight as it can be, and it sticks up, maybe 1/4". other than thet i dont see anything that can be adjusted. its pretty loose once its loose.
     
  18. metalzombievi

    metalzombievi Member

    i pretty sure its the exhaust thats causing the problems. i went to take the cap off and check out the exhaust to see if there was stuff in there, but the screw wasnt doing anything. it was liturally just there for looks. took it off and now it starts up and pretty much runs better over all.
     
  19. Rolling2High

    Rolling2High Member

    That copper piece is your fuel jet. For a stock motor you need a 65 mm for that carb. You can't adjust anything except Change the jet. That pin let's the bowl move up and down, it's a hinge. If it don't move and "float" the carb floods with fuel or starves and won't work.i have a carb like it and it sucks.
     
  20. Purple Haze

    Purple Haze Active Member

    It has a metal tang that the float rides on; bend it with needlenose pliers to adjust the float height. The picture shows it to be about right. Another thing to check would be the throttle cable, take all the slack out (lengthen) then the idle screw will need to be re-adjusted. If that don't fix it, it's probably jetted too rich. Rolling2High recommends #65 jet, but that depends on altitude. The higher the altitude, the leaner the jet.
     
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