Similarities in Chainsaw Brands & Specific Models

[Kelly Jackson]

Some time ago, I read that Husqvarna Models 50,51 & 55 Depending on Year and Production Date shared in Many Cases Pistons, Cylinders, Crank and Carbs with Several Saws in the Partner 500 Series or Partner/Pioneer 5000 & 5500 Models. I have a 1990/91 Husqvarna Model 55 c/w: 46mm Cylinder & Piston Assembly which is an Open Port Assembly. Could anyone advise which of the Partner or Pioneer/Partner Models may have the Same Set up. Also, if i Read this Article Correctly,it also stipulated that Husqvarna Models 61, Rancher, Practica, 66,162,266,288, 272XP as well as Jonsered 625,630, & 670 all une similar of the Same Cylinder/Piston Assemblies (Depending on Bore Size). Can Someone Describe Application Differences in Terms of What will Fita 1990/91 Model 55 c/w: 46mm Bore

 

[WoodmanSr]

Some time ago, I read that Husqvarna Models 50,51 & 55 Depending on Year and Production Date shared in Many Cases Pistons, Cylinders, Crank and Carbs with Several Saws in the Partner 500 Series or Partner/Pioneer 5000 & 5500 Models. I have a 1990/91 Husqvarna Model 55 c/w: 46mm Cylinder & Piston Assembly which is an Open Port Assembly. Could anyone advise which of the Partner or Pioneer/Partner Models may have the Same Set up. Also, if i Read this Article Correctly,it also stipulated that Husqvarna Models 61, Rancher, Practica, 66,162,266,288, 272XP as well as Jonsered 625,630, & 670 all une similar of the Same Cylinder/Piston Assemblies (Depending on Bore Size). Can Someone Describe Application Differences in Terms of What will Fita 1990/91 Model 55 c/w: 46mm Bore

So I have great appreciation of the 55, 353, Poulan Pro 325 saw group. Fabulous firewood saws.

Do research. Are many useful comments in 350/50/51/55/346xp conversions. I can't locate the specific 46mm discussion but enclosed key notes (apologies that I can't credit original author)

Here on AS: look at...
"Whats the diff between 55 and 55 Rancher?"
Paul Bunyan Feb 28, 2005

Search topic on another forum title: "Re: Poulan Pro 325 IPL & Parts" 2019. There are 3 models Electrolux that used 46mm in that discussion.

The 55 & pp325 Piston & Cylinder Assembly don't exchange. Must be both 55 or both pp325.
.. pp325 Type I is closed port 46mm
.. pp325 Type II is open port 46mm
.. see IPL for pp325. P&C are extremely rare. Never seen offered. About must know someone that's a Partner collector. Occasionally a pp325 saw comes up for sale but $400+ asking. What I've noticed is KY/IN/OH/NY regional thing. The pp325.

I've read some statement or conjecture that Stihl 028 Super 46mm might be convertible. Not sure as per below uniqueness.

PP325 vs Husq 55 P&C
1. pp325 Heat Isolator 0.077" (places pp325 case at normal deck height of 51/55, 490, or 5000)
2. pp325 Piston Rim to Pin +.065" also (difference 3)
3. pp325 jug 0.093-0.094" deeper to squish band.

Again, others have contributed the above. Just notes I've kept for recall. Thank you goes to them.

 

[huskihl]

66,162,266,288, 272XP as well as Jonsered 625,630, & 670 all une similar of the Same Cylinder/Piston Assemblies (Depending on Bore Size

I think you meant 268, not the 288.
Cases are the same in the same era, but cases changed when they went to a single coil in between the 266 and 268. Cylinders will all bolt up, but the mufflers and carb/mounting methods were different. Still doable if you have the correct parts that the specific model needs to work correctly

 

[huskihl]

So I have great appreciation of the 55, 353, Poulan Pro 325 saw group. Fabulous firewood saws.

Do research. Are many useful comments in 350/50/51/55/346xp conversions. I can't locate the specific 46mm discussion but enclosed key notes (apologies that I can't credit original author)

As clarification, the 350 and 346 aren’t compatible with any 1 or 2 series as a bolt on alternative. Spring a/v, bottom fed transfer ports, etc. The 50, 51 and 55 share some parts/similarities with the 257-262xp saws.

 

[82F100SWB]

The 50/51/55 are based on the Partner 5000 chassis saws. They don't use the chassis, but they do use the crank, ignition, flywheel, piston and cylinder and clutch/drum etc. The 50 uses the 44mm 500 top end, the 50 Special uses the 44mm Formula 500 top end, and the 55 uses the 46mm top end found on the Partner 540/543.
Yes you can bolt on the closed port top end from the 5000, 5100, 5500 and their equivalents, the Jonsered 490, 590 and Poulan Pro 325 respectively. Can you find those top ends and parts for them? Not really, especially not the 5500/325.
The 45mm closed port 55 top end is similar to the 590/5100 cylinders, but it is not the same it has a larger chamber and less aggressive porting. Likely changes made for emissions.
If you insist on staying 46mm, you already have the best top end for it that you can buy parts for.

Left to right, 325, 590, 55 with a Hyway closed port 46mm(do not reccomend) and my full circle crank 50 with a 5000 top end.