To everyone that offered help and suggestions, thank you!
I have fixed my P41S, it is now a P41S/45.
Beavers, thank you for the ideas on diagnosis the problem. I was spending to much time heading down a dead end road. The parts are from Unatainium so what difference does it make what failed?
The P41S that recently found its way to me has a bad ignition period, and there is very slim chance of locating parts for a P41S, so I decided to not waste any more time going in that direction.
I have been flying R/C airplane since 78, in 84 I started building and flying giant scale planes, and sourcing, building/modifying my own engines for those planes from old chainsaws. The first two engine were from 65cc Remington/John Deere chainsaws , both old reed valve points designed. Good solid running engines will turn 24" props with authority. Third engine was from an old 70cc 4.2 Lombard saw. And the list goes on!
Some were around then, Klaus , a canadian, started marketing more Quadra Arrow engines. Q65, Q75 and Q100 were added to the 30:, 35cc, 40cc and 42cc line of engines. Many small saws use the 30 to 42cc engines and the larger 3 all share Pioneer/Partner chainsaw goodies. The Quadra Q65 even used a cut out of chainsaw magnesium case. The Q75 and Q100 were crank cases cast/designed for R/C use.
Well when I pulled the recoil housing on my P41S I saw a Quadra Q65 staring at me right there in front of me, but it had a morphidite 2 piece ignition set up different than the great rc aircraft version. Unfortunately this ignition had decided to take a permanent vacation.
Around 2000 I was given a Quadra Q75 with a bent or most likely twisted crank. I never got the correct round tuit to pull it apart and see or to fix it. Well this is a Q75 with 1 piece Phelan mag.
Has anyone recognized the muffler as a Partneer? They came with the blank muffler and instructions on pipe numbers and sizes for user to install.
This morning I compared the flywheel from my saw and this engine. The flywheels were the same, other than cut fins for rc use on the Q75. At 3:36 ESDT, my P41S ran with the 75cc cylinder, piston and great easy to find / replace Phelon 1 piece mag.
Now have decompression.
I am currently running the 41S carb and stock muffler. I may add a second outlet to the muffler cover.
If I decide to replace the seals on the crank, I will at that time pull the saw completely apart and mill in another transfer opening in the mag side of the case. The Q75 cylinder has the 2 boost ports opposite the exhaust. The stock 41S case does not have the cut to feed them and I didn't want to take the time today to disassemble every thingy to clean all the chips out from the cutting the passage way would have created. Besides I wanted to dry the muffler out and hear engine noise.
Would you just look at that decompression button.
I can see more Quadra chainsaws in my future, OOPS, Pioneer , what was I thinking. Lol
Laus Deo,
For the republic,
Ken - Screwbolts
