550 XP Mark II or MS 261

[furb]

Now i don’t drink but, what brand of beer!

Modelo

 

[furb]

The MK1s had a lean fuel curve straight out of the factory as late as 2016-2017 when mine was produced. Once I had my AT updated in 2019, all start/restart problems went away. The idle fuel curve was fattened up, no need for a high idle to restart.

Cold starts: do not use the decomp on the MK1s, it somehow interferes with what the earlier version of AT was trying to do at cold start/restart.

It has bog unless you let it idle for awhile. I guess it’s okay if you are patient but if you are cutting roads open you want to get in and out

 

[furb]

Nothing like putting these saws back in action after they've been thrashed.

I got some good saws from their junk pile

 

[ZERO]

20 incher backed up by the MK2 North Woods power plant. @Stump Shot

Steve's signature:
Easy peasy start
Easy peasy restart

Puts a Big'O stupid smile each time, one feisty diva.

Six years of trouble free operation, start and go, does not miss a beat.

Not that Steve could not do the same for a 261, don't have one, can't compare.

 

[Maintenance Chief]

I put this smashed 261C together after parts became more affordable; BGD and an extra muffler outlet. I'm pleased with it's power and rpm .

 

[furb]

I put this smashed 261C together after parts became more affordable; BGD and an extra muffler outlet. I'm pleased with it's power and rpm .

Parts are still brutal. That 661 intake boot was over $80. I buy every 261, 271, 291 carcass I can scavenge. Just top covers are all $80 for the 261. I ended up buying standard carb covers to get something cheaper