doc874
Addicted to ArboristSite
Whats the potential problems running a non-windowed piston in a saw that originally had a windowed piston. I particularly wish to know about a jonsered 490. Due to porting will the saw run or will it work at all?
Windowed piston versus non-windowed
- Thread starter doc874
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Tzed250
Addicted to ArboristSite
Why not cut a window in the new one?
scootr
ArboristSite Guru
The windows are fuel delivery, no windows, no fuel. Closed p/c has a slot running down the side of cyl. into crankcase. Window cyl lines up with piston window to pass fuel from crankcase. It prolly won't run with that combo. If you are having a hard time finding a piston check the Husky 50, 51. Some of those had windowed pistons. Oh yea, Partner 5000 also.
PES+
Addicted to ArboristSite
hmmmmmmm what about the 365/372?
no windahs and closed ports.
ROTF.....there are more than a few open port motors with windowed pistons too.
The reason there are no 490 pistons available is it is the same as a 5000 partner so no steals and deals there...I have only one of these pistons left and it is expensive.
It may be more advantageous to use as a mold pattern and not be sold at all.
no windahs and closed ports.
ROTF.....there are more than a few open port motors with windowed pistons too.
The reason there are no 490 pistons available is it is the same as a 5000 partner so no steals and deals there...I have only one of these pistons left and it is expensive.
It may be more advantageous to use as a mold pattern and not be sold at all.
doc874
Addicted to ArboristSite
Go ahead and mold that piston i'd buy one. I actually cleaned up the original as it was only very lightly marked could barely feel it with finger nail. I threw a Husky 50 ring on it and now it runs great, go figure. I had thought about opening the transfers in the cylinder as someone mentioned here but thought it would be easier and cheaper to just clean and go.
Last edited:
sixcylinder1
ArboristSite Member
Here is a Jonsered 490 Piston... http://www.ebay.com/itm/JONSERED-49...037499?hash=item58c740d77b:g:-YEAAOSw-vlVgyuS
