Pioneer chainsaws

[heimannm]

I acquired this Holiday II at the PNW GTG and decided to give it a good cleanup before moving it to the museum display.



Like many of the Pioneer saws this one had a primer rather than a choke. Unfortunately the bulb for the primer is missing.



Not like any carburetor I have seen before.



I presume the tee would have supplied the primer but without the bulb someone decided to plug it. I also presume the fitting on top of the carburetor was for the discharge from the primer into the carburetor throat.



The starter is atypical for most saws, but not uncommon for Pioneer, and the action of the starter also operates the compression release.







It also has a spring loaded bar adjuster, just loosen the bar nuts and the chain is automatically tensioned.



Runs on prime. I am not going to pursue fuel in the tank since it is just going into the display.





Mark

 

[altatim]

Made a 3D printed adapter and then modified a bar to work with the tensioner. Works really well!

 

[Squareground3691]

Some goodie’s for the P51 ,

 

[altatim]

What are the crank seal numbers I want for the P50? And does someone have the intake block and reeds numbers and rings? I want to get this saw back to its former state and I don't mean just paint it lol

EDIT: If someone has a sized drawing for the Poulan Pro felling dogs for this saw that would be sweet to have! If not just a few dimensions (hole distance, tooth lengths) and one good picture from the top and I can just recreate it in Fusion360 and get some laser cut.

 

[cbfarmall]

Started working on my 700G. Tore it down to send the case out to repair a crack. In the meanwhile, I painted the rest of the parts. Found lots of new stuff in my stash.

 

[cbfarmall]

Got the 700G done.

 

[heimannm]

Beauty

 

[cbfarmall]

Beauty

Thanks. Definitely worthwhile. I am tempted to set up another of these with the outboard sprocket. Never seen one like that.

 

[89HD]

That looks great, nice job.

 

[flatsfisher]

great job. what an awesome design.

 

[Mac&trees]

Got the 700G done.

View attachment 1194188View attachment 1194189View attachment 1194190View attachment 1194191Great work

 

[Squareground3691]

View attachment IMG_2255.mov

 

[108logger]

I have a Pioneer P61 that I rebuilt with a new piston, crank seals and rebuilt the carb.

Unfortunately it failed a second time and trashed the piston and the bore. Can't justify putting more money into it again.

Got lots of good parts still if anyone is looking for some.

 

[Squareground3691]

I have a Pioneer P61 that I rebuilt with a new piston, crank seals and rebuilt the carb.

Unfortunately it failed a second time and trashed the piston and the bore. Can't justify putting more money into it again.

Got lots of good parts still if anyone is looking for some.

What was the reason of failure, ?

 

[108logger]

What was the reason of failure, ?

Don’t know. Lost the original piston after a few minutes, scored side of cylinder near exhaust port.

New piston and rings ran about 10 3 minute cycles and finally did same thing. Scored cylinder in same spot and lost compression.

I had the gas oil mixture plenty rich enough, don’t see that being an issue.

Gas appeared to be boiling in tank and I could see it foaming up inside fuel line right before it would lose power and die. Saw would fire up and run for a couple minutes and wind down again, eventually it wore out and lost compression

 

[Yukon Stihl]

Did you do a vacuum pressure test on it before you replaced the original piston?
And after you reassembled it?

 

[Squareground3691]

Sounds like a severe air leak to lean condition , How old was the gas mixture,

 

[108logger]

Didn’t do a vacuum test before or after rebuilding. Only compression tested.

The fuel was new, 91 octane with synthetic oil.

Kept mixture rich with oil about 35:1 for break in.

 

[Yukon Stihl]

A vacuum and pressure test should be done before you take apart a scored saw in order to find the reason it scored the first time.

 

[hpeyerl]

New to AS.

Bought an old hermit's property and found this old P20. The old man was not a small-engine maintainer so a lot of 'dead' pile had fairly simple problems. This P20 had a cracked fuel pickup line and was sucking air. Put in a new line, cleaned out the fuel tank, and it fired right up on the first pull, ran solid on the second pull and chewed through a decent sized Aspen like nobody's business.

I'm new to Pioneer and I'm hoping this P20 isn't the gateway saw to a new hobby. My daily driver is an MS362 but this little P20 is so light, I can see myself picking it up first for smaller trees, delimbing, bucking.