Hello. I am working on a open port Husqvarna 268. I have to change the piston snd i can't find the right piston. Can i use the windowed piston of a 268 XP? I was looking at the Dolmar 7900 design [ big open transfers and windowed piston] and i was thinking to put the 268 XP piston. What do you think. Thanks.
Husqvarna 268 open port
- Thread starter nenicu
- Start date
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It will work fine with a windowed piston, a closed port cylinder however will not work optimal with a non-windowed piston. http://www.arboristsite.com/community/threads/windowed-piston-versus-non-windowed.75769/
Chainsaw Jim
CJ Saws, LLC
It should actually perform better with the windowed piston. The Windows allow air flow through the piston which helps cool it, plus the needle bearing will lubricate more efficiently.
I did notice on the two 266SE both pistons have a window. The cylinders for both are constant diameter full length. On the 268 and 162SE I also have apart both pistons have the open skirt and the cylinders get larger near the transfer port area. So I assumed a windowed piston wouldn't work in the 268 cylinder. But I really don't know and based on the above comments it might work.
Brian
Brian
Chainsaw Jim
CJ Saws, LLC
There's a lot I don't know about chainsaws, but it just doesn't sound right for a cylinder bore to be barrel or cone shaped like you mention unless it is worn out or has been improperly honed from a previous rebuild.
Big_Wood
westcoast dweller
every dual port cylinder i have ever seen closed port or open runs better with a windowed piston
Thanks . I have experimented whith a open port Partner 540[Husqvarna 55 cylinder and piston]. It works better with a windowed piston[Jonsered 2055 piston 46 mm]. In this case the cylinder has double open transfers on each side, so i was thinking if an windowed piston is gonna work, then i remembered: The old piston for Dolmar 7900 was like the H 268 S/k piston, the new piston is windowed.[As seen on Arboristsite].
