Chainsaw Repair

I've been working on Stihl FS55R's.

Gas is not as bad around here as in some areas.

Takes some 10 years for gas/oil mix to turn black.

Son brought an old 1967 Simplicity rotor tiller around the other day. I could smell the old gas. It started up and ran but the intake valve eventually stuck in it. 4Hp B&S. I pulled the head and PB blasted the intake stem. Beat the valve down with a hammer. It runs great. Well built, hardly used. Has reverse.

Those are good saws

1st page side exit 365 muffler Roger. No chain brake saw.  Check info in 3500 thread at end.

Well guys I finished up my second PP365.   List of things done on this saw.
Opened up the ports.    Intake and exhaust.
Ground on the top of the transfer ports to direct them a little more towards the intake.
Opened the bottom of the transfer ports a little.
Thinned the bottom of the divider between the transfer ports to get better flow.
Dropped the cylinder to a squish of .022"
Port matched the intake rubber boot to the cylinder.
Port matched the muffler to the exhaust port of the cylinder.
Installed new crank seals.
Advanced the timing.
Installed a new OEM piston and ring.
The cylinder was a used one I have had hanging around for the last 3 years or so.
I used a ball hone on it to soften all the edges of the ports.   Less chance of hanging a ring.   Then ultrasonic for getting it really clean.
Changed the carb over from a HDA 49 to the HDA 164.   Bigger carb.
Installed a new rubber intake boot for the larger carb.
Put on a used metal plate and gasket that goes between the carb and rubber intake boot.   Required for the bigger carb.   I got it from a 330 parts saw.
Modified the muffler.
Tuned the saw to 4 stroke at 13,000 RPM's with the bar and chain on.
This is not a race saw but a good running working saw that I will use in the mountains come summer time.
One more thing about the PP365 is that it weighs less than the 3750 but with these modifications it now has the same output power. 

Ran the saw today and it will flat get with the program.   I really like this series of saws from Poulan and with the right modification can really be made to run.

First a few pics of the cylinder while I had it off and all the work was completed on it.
Then a few more pics of the muffler mod.
The pic with the flat piece of metal laying next to it is what I used to do my muffler mod.

With the bumped up compression and the bigger carb it revs nice and quick.   They are so easy to work on also.