Wild Knight
ArboristSite Guru
I want to mod my 441 to make it a little better work saw. I'd like to increase the torque, while minimizing the change in fuel consumption.
I know the basic mods consist of opening the muffler, porting, polishing, lightening the piston, raising compression (either pop-up or lowering the jug). I have read that the muffler mod produces the most gains. While porting and polishing takes the most time, it yields the least gains per effort unless you really take away some metal. All of these mods come at the expense of extra fuel though. I'm told raising the compression is great for building torque and doesn't hurt fuel consumption. Don't know how much gain there would be by lightening the piston.
What would be the priority list of steps for building a work saw (more power, minimum increase in fuel consumption)? I am kinda thinking it may go something like this:
1) raise compression (lower jug, pop-up, still use a gasket)
2) muffler mod (50-60% bigger)
3) polish (remove casting marks, make smooth)
4) port (5-10% wider)
5) lighten the piston
I know the basic mods consist of opening the muffler, porting, polishing, lightening the piston, raising compression (either pop-up or lowering the jug). I have read that the muffler mod produces the most gains. While porting and polishing takes the most time, it yields the least gains per effort unless you really take away some metal. All of these mods come at the expense of extra fuel though. I'm told raising the compression is great for building torque and doesn't hurt fuel consumption. Don't know how much gain there would be by lightening the piston.
What would be the priority list of steps for building a work saw (more power, minimum increase in fuel consumption)? I am kinda thinking it may go something like this:
1) raise compression (lower jug, pop-up, still use a gasket)
2) muffler mod (50-60% bigger)
3) polish (remove casting marks, make smooth)
4) port (5-10% wider)
5) lighten the piston