Even though i have rebuilt the carb on my husqvarna 240e saw its a zama carb and it still isint doing right it will crank up and give it gas and it dies, a person told me that the 2 cycle carburetors have a coating and the ethano; gas eats the coating off and they are messed up , my question is i have a new zama carburetor i need to get and put it on my saw BUT will i have to set it any or will it be ready to go

Can be located on the carb.! it is on the left hand side of the saw below the primer bulb but above the L/H screws

You need to pressure test the carb, if the needle is leaking you will never get to run well, if you have fitted a new rubber tipped needle and it still leaks you will have to replace the carb, the later carb was a Zama rather than the Walbro, it made the saw run so much better.

The primer pulls fuel from the metering side of the carb, if there is no fuel here it is because either the fuel filter in the tank is blocked, or the fuel hose is trapped, or the non return valve in the carb itself is stuck, this can happen if the saw has been left with a rich oil mixture left in it.

The original carb was a Walbro compensator carb, they replaced this carb with a Zama which transformed the running.

Hi and welcome to FixYa, I am Kelly You should have 120 PSI or greater compression. There is a ported compression release so you may see as little as 110 PSI but it is best to see 120 or greater.

The Owners manual is here:
http://www.northerntool.com/downloads/manuals/195946.pdf

carb basic settings are on page 29 of the manual.

The saw has a Zama C3-EL18 carb.
The manual for the carb is here:
http://www.zamacarb.com/pdfs/TechGuide_2007.pdf (Click and wait 2.50 mb)
Your carb is the C3

The workshop manual for the saw is here:
http://www.scribd.com/doc/8152011/Husqvarna-Chainsaw-Workshop-Manual-340345346XP350351353 (Must have a facebook account to download but can be viewed online)

Thanks for choosing FixYa,
Kelly

Carefully check the integrity of the gas line in the tank...make SURE the fuel filter is absolutely clean. If that's all OK, maybe you need a carb kit....try not to run ethanol gas if you can...it destorys small carbs on chainsaws.

Check there are no kinks in fuel line.
Make sure that the air filter isn't blocked.
Check the throttle cable is operating the throttle plate in the carburettor ok.
Ensure chain isn't too tight.
The carburettor should be a tight fit on the air inlet manifold.
It's possible that some of the jets could be blocked in the carburettor. You can try and clean these with compressed air but ensure you remove any seals gaskets, springs on the diaphragm pump , primer bulb etc as they can be damaged by the pressure.
You can also buy an aerosol can of starter fluid at your local autoparts store. This is sprayed into the carburettor to clear any partial blockages.

The 235/240E had major main bearing problems, the bearing cage on the clutch side breaks up and pinches the piston ring in, if the machines has a good spark and clean carb, i would be looking to check the it is mechanically sound, unfortunatley this means a full strip down, let me know if you need more help, i have done very many of these machines.

hi
if you have a good compression,a strong enough blue spark and carburetion for the fuel air mixture try priming the engine(put small amount of gas in the spark plug hole)then start the engine.If the engine runs only the gas you put inside the cilinder there is a carburetion problem to find and fix.
let me know regards savumihai71

Yes a carb kit is avail all day long. Go online to my website and enter your carb kit number Lakeviewpower.com