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i need some things confirmed ... what is the purpose of each port? in pic attached i have each circled and labeled 1, 2, 3 ... do any of them need to be capped?
also, the screw next to circle 3, should it have loctite? why would it leak?
Number 1 is fuel inlet from tank. Number 2 is breather, but many bikes have a pipe going upwards from 2, so you can go through deep water. Check if you have a breather pipe already on the bike, leading upwards to about fuel tank level. Number 3 is drain from float chamber, the screw beside it allows you to drain fuel from carb when cracked open, but there is another inlet for this pipe, above float level, in carb. If the float needle leaks, excess fuel can escape through this and run downwards through that pipe. The screw should not leak when seated, but fuel can still leak from pipe 3 if the float needle is leaking.
Number 1 is fuel inlet from tank. Number 2 is breather, but many bikes have a pipe going upwards from 2, so you can go through deep water. Check if you have a breather pipe already on the bike, leading upwards to about fuel tank level. Number 3 is drain from float chamber, the screw beside it allows you to drain fuel from carb when cracked open, but there is another inlet for this pipe, above float level, in carb. If the float needle leaks, excess fuel can escape through this and run downwards through that pipe. The screw should not leak when seated, but fuel can still leak from pipe 3 if the float needle is leaking.
Check that screw, next to it, is fully screwed in. If it is then the float needle is probably leaking. May just be dirt in it, so easy way to fix is turn fuel off at the tank and run bike until it stalls, then open tap. Rush of fuel may flush dirt past needle. If it doesn't, take carb apart and clean float needle and seat. Check there isn't dirt in the seat of that screw, referred to earlier, as well. If that doesn't cure it you have a dud carb.
Check that screw, next to it, is fully screwed in. If it is then the float needle is probably leaking. May just be dirt in it, so easy way to fix is turn fuel off at the tank and run bike until it stalls, then open tap. Rush of fuel may flush dirt past needle. If it doesn't, take carb apart and clean float needle and seat. Check there isn't dirt in the seat of that screw, referred to earlier, as well. If that doesn't cure it you have a dud carb.
will do. hard to believe it would be dirt considering its brand new. i also saw someone turn the fuel off, drain the carb, and shoot compressed air in an attempt to clear the float.
im gonna have to take the new carb apart. compressed air and what merryman described didn't work. frustrating considering the carb is brand new. everything else is working great! (i replaced the battery, CDI, ignition coil, spark plug, solenoid, oil change, and fuel filter). if i shut the fuel off it stops dripping and fires right up.
You have to take out the hinge pin, remove the float and needle and clean needle and seat. There could also be a problem with the seat on the drain screw, so remove and check that. Refit and see if it still dribbles. As it has a metal tang on the float for float height adjustment, this too could be out. Fit a clear pipe from pipe union 3, turn it upwards and crack open that screw, fuel should flow into pipe until it is level with the float level, this should be just about where the float bowl to carb joint is, preferably a little lower, if it is above that adjust the tang on the float to fetch it down. If it comes to a level then continues to rise very slowly, the float needle is still leaking. Do not leave the pipe pointing upwards after re setting float. If it still dribbles after the float level and needle test right by the pipe, the drain screw must be leaking.
Dec 2, 2021 | 10:07 PM
new carb from whygostock - confused on ports and leaks
