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550 XP Mark II or MS 261

redneckhillbilly

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the more saws you own the more you have to be aware of, I only have 4 saws and its always in the back of my mind what saw has sat the longest and how can i get it some run time. today im going to use a 592 on a 16 inch fir tree because it hasnt been used in 2 months and I need to cycle some fresh fuel through it, its not the ideal saw for the task, but I dont want any issues with it so I will use it instead of just let it sit for who knows how long and risk having problems.

i saw pretty consistantly from april through december, when I am putting them up for the year I dump my 40:1 dominator out and fill with canned husky mix and run them for a few minutes to assure the canned fuel has fully made its way into the carb. than I hang them on the rack and let them sit, thats been my recipe for a few years now and its has worked fine, no issues what so ever.
 

dangerousatom

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Both saws are ideal for a wood burning home owner who likes to cut.

The 550 responds exceptionally well to a muff-mod, gasket delete and porting out the casting angles in the lower bit of the cylinder along with opening up the beginnings of the stratos. I have 2 and one has a pop-up piston. The pressure gauges says its 10-15psi more then the other but I cant say its noticeably different/better then a stock piston.

Just a muff-mod and foam air filter upgrade will be a noticeable gain.
 
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