Chainsaw Repair

great, just great! now i'm stuck here at work and all i can think of is getting home and teraring into that frigging 800 thanks alot. now i won't get anything done

Installed an 8000 p&c set last week which came from the factory with a pop up and quad port cylinder.  The old flat top p&c ran a loose squish.  The new set after installation is around 180psi stock with about 15 minutes run time.  OEM Part number for the p&c set is p050005320.  This is rings, piston, clips, pin, base gasket, and top bearing.     

Do you happen to have any pictures you could post? Sounds real gooooooood.

The older 8000 pistons that Im familiar with are 52mm in diameter with a full circle skirt (not slipper style) using a 13mm pin.  The pistons use two 1.2mm rings and have a flat crown.  The cylinder design uses closed transfer ports, sometimes called tea 'cup style', that breath through the windows of the piston with one on each side.     

The newer parts that I recently installed were different. 

The new oem cylinder has a vertical divider cast down through the center of each transfer duct, with one large opening at the bottom, but with two openings on each side at the top transfer port position.  The transfer ports continue to be of the closed style and are fed through the piston windows.     

The new oem piston has a .030 flat top 'pop up' in the middle of the crown.  It has been cast this way from the looks of things.  When I take the pics I will look to see if the piston was domed first before having the pop up machined off flat.

On this engine I measured the old squish to be .040".  Standard static compression for the engine per the manual should be 135-150 psi.

The combustion chambers are small which helps make good power given the loose squish.       

There is a provision for a compression release on the side of the cylinder but Ive never see one that was installed.
       
I will get some pics up in a day or so.     

WELL!  the echo echo is back together, it drank one tank of gas and is sitting just a hair under 180psi. seems to be a bit of a dog to pull over right now so i might think of tossing a decomp somewhere out of the way. good torque for the first tank and she was a little richer than i really wanted. just barely coming clean in the cut. the new 38" bar and clutch bearing should be at the dealer today or tomorrow. should have no problem pulling it
good thing. me and my buddy need to go and clean up a 4' dia. elm on one of his co-workers backyard after christmas caaaaaaaaaan't wait!

oh i have no problem starting it i just loved the look on alans' face when he slowly pulled the handle while the saw was sitting on the bench.
sheeesh! ( i won't repeat the actual word ) thats a little heavy!
feels like starting a husky 2100
drop starts are a b1tch, but no biggie! hoping it won't climb too much after a few tanks. these saws seem to have sufficient cooling, and i don't think it would be a hot runner anyway. but i don't want to be running any of that funny smelling hi octane fuel i need for the mustang. i like regular fuel, even with the ethanol

yup i've heard you saying you like them rescue handles (or snowblower handles up here ). i figure one of them small rubber mcculloch handles from a mm110 would be a nice fit