Microlighters

motor 582 runs well..starts well but on idle or lower revs the bowls overflow
have fitted new carb kit..float levels correct.
possiblly carb piston wear?? i have never changed the pistons.
fuel pours all over the exhaust..im a flying timebomb right now..been advised to change carb pistons..expensive change for doing the process of elimination thing...
ALL ADVISE/EXPERIENCE FROM FORUM MEMBERS WELCOME

Simple to fix, if it is leaking from the venting tubes

the float is not closing the needle and seat off properly

Bend this little tag (red arrow) slightly up (blue arrow). It presses needle 19 against the seat.

Start the plane, warm it up, run at 3/4 throttle for a while and shut off.

Take the bowls off carefully and remove the floats. The bowls should be filled up to about 12mm before the top

Alternatively replace the needles and seat.

thanks Morph...will try that...although float level looks right..and have put new needle and seats.

Had the same problem with my carbs, start and after a while at idle the carbs overflow.
Did just as Morph showed and it worked perfectly !

The carb pistons have no influence on the amount of fuel in the float bowl so changing them will definitely not cure your problem, it will only make your bank balance smaller. If you have already fitted new float needles and set the float levels as per Morph's instructions and you still have a problem, then refer back to Morph's picture and look at part number 2. This is called the float suspension. Closely examine this part where the needle makes contact with it and see if there is an indentation worn into it. If there is, then it may be holding the new needles off centre which will prevent them from sealing correctly at idle because that is when the engine is shaking around a bit. If this is the case, then you will need to renew these parts. If the float suspension arms look to be in good condition, then make sure that the carbs are balanced to obtain a smooth idle, because a rough idle makes the engine shake and that can upset the needles ability to seal.
Hope this helps. Good luck

Thanks Tandemtod all advise will help as i dont want to spend unessasarally(spelling not my fortae)lol
dont see part number 2 in morphs drawing. mabe im just too doff

Thanks anyway...you guys are always a mine of experience and information that you cant buy in a book

. If the float suspension arms look to be in good condition, then make sure that the carbs are balanced to obtain a smooth idle, because a rough idle makes the engine shake and that can upset the needles ability to seal



ttodd i think this statement is very relevant to my situation

part number 2 is next to the red arrow

see no 2 now.. sometimes you cant see the wood..for the trees.
thanks Andy

Have you checked if your floats are actually floating ?
I had two of them become "sinks" before , one in each carb.

have checked.
thanks for input

[attachment=1]DSC01819.JPG[/attachmen
Note the wear on the slide pistons and the indentation on the air screw setting area
Thats the reason for overflowing
causing rough idle and unseating needle and seats
thanks to all for your input and help

Thats some seious wear, I don't remember ever seeing slides as bad as that. I am sure that that is causing a very rough idle and when you replace them your problem will be solved.
Well spotted.