550xp power loss

[Acerforestry]

I know there are more threads about miss-perfoming XP's than probably anything else on this forum, but quite simply I'd like to ask if anyone knows if the following issue with an early (2012) 550 is worth trying to sort economically, or is better left to someone else with with more time on their hands to faff with. Compression good, starts on choke on first few pulls, then deteriorates it seems the warmer the day it is, or the warmer the saw gets. Power loss, insufficient revs, will cut out and will then only start (if I'm lucky)dropped with full throttle. TIA, Phil

Edited May 25, 2020 by Acerforestry
spelling

[adw]

There were a few modifications done after this year.

Removing the hose from the breather, the hose is then blanked off, and the breather left open.

Removing the fuel hose from its location, and shortening so as to keep it further from the cylinder ( this does entail re positioning the carb inlet elbow).

Slot cut out of the top cover to allow better cooling of the rear of the cylinder.

You can also blank off the the deco valve.

Use the purge to pull cooler fuel through the carb.

[spudulike]

What does the compression measure, you usually get 130-145psi with the lower figs being caused by the smaller plug adaptor.

The cylinder gasket can fail by the front lower transfers...or under the muffler and the carbs have the usual issues so it is worth an inspection.

Try the breather mod ADW mentions, worth a try.