540 XP

[D Seaman]

Hello everyone. I’m hoping someone can help me out with a problem with my 540 XP. It’s 3 or 4 years old and every summer, since I bought it, it plays up in the heat/summer sun. It won’t idle and is  very difficult, if not impossible, to re-start without setting the choke to half choke/throttle. Fuel moisture can be seen around the gap where the air filter sits. The tank is getting pressurised and it seems to be flooding. 
 

I do basic maintenance but am not really up for more complicated repairs and investigations. My local dealer doesn’t allow pre-booking for repairs and I really don’t want it to go in and just sit there for a week or two before they look at it. There is another dealer that is a wizard when it comes to chainsaw etc but they are an hour drive away. I’m not trying to avoid paying a dealer, I just hoping someone can save me a fairly big inconvenience. 
 

I’ve attached a screenshot from an American site that discussed the problem. 
 

Any suggestions will be greatly appreciated!!!

 

Thanks all 

 

David 

[Stubby]

3 hours ago, D Seaman said:

Hello everyone. I’m hoping someone can help me out with a problem with my 540 XP. It’s 3 or 4 years old and every summer, since I bought it, it plays up in the heat/summer sun. It won’t idle and is  very difficult, if not impossible, to re-start without setting the choke to half choke/throttle. Fuel moisture can be seen around the gap where the air filter sits. The tank is getting pressurised and it seems to be flooding. 
 

I do basic maintenance but am not really up for more complicated repairs and investigations. My local dealer doesn’t allow pre-booking for repairs and I really don’t want it to go in and just sit there for a week or two before they look at it. There is another dealer that is a wizard when it comes to chainsaw etc but they are an hour drive away. I’m not trying to avoid paying a dealer, I just hoping someone can save me a fairly big inconvenience. 
 

I’ve attached a screenshot from an American site that discussed the problem. 
 

Any suggestions will be greatly appreciated!!!

 

Thanks all 

 

David 

Try a new tank breather . Could be partially blocked . Might just be vaporization .

[spudulike]

It could also be the needle valve in the carb not sealing particularly well or I have seen the carb diaphragm on 540s getting pretty "bagged out" and deformed so it may be worth fitting a new carb kit.

 

[adw]

If the saw is flooding it maybe as follows, this is quite difficult to explain but will have a go, the carb is a compensator carb so has no vent hole in the metering cover, behind the air filter is two white elbows with a short black link pipe, the elbow on the left feeds directly onto the compensator channel in the carb, so diss connect the black pipe from the left white elbow, slacken the two carb screws so as the filter plate is lose, now pressure test the elbow, there should be zero restriction, it is possible the white elbow has not been drilled right through, this then effects the flip side of the metering diaphragm and will cause the carb to flood.

[D Seaman]

Thank you replying and giving some suggestions.