550XP - Mk1 Cutting out at more than 3/4 throttle

[Mr Saurus]

I've had my 550XP for 5+ yrs and its just started to cut out at anymore that 3/4 throttle. It starts back up again first pull and only seems to cut out when warm/up to temp. Apologies if I'm being thick, but its their a way to adjust the carb on an autotune? Could it be the coil? It possibly feels down on power but that could be phycological as I'm using my 372 a lot since this issue. 

 

TIA 

[spudulike]

Possibly a bit of gunk in the gauze strainer, the pump diaphragm may be holed on the sealing flaps or the air filter may be dirty...don't be fooled by it "Looking" clean, the orange ones especially as the open areas block easily and look clean but they are not.

[adw]

As Spud said, order a new air filter and try it again if it’s the orange frame filter, if not fuel tank breather? fuel filter in the tank dirty? and finally main bearing cage breaking up and torn the crank seal, check the spark arrestor to see if there is some strange melted stuff in it, what ever you find I would get this checked out if you can find somebody capable to diagnose it.

[Mr Saurus]

Thanks Spud and ADW, i'll have a poke around the see what nick the fuel elements are in.