I've never thought a 150 was good for more than 4-6" same as with a stock 2511t. If a chain uses little power for the length, that can trick you into thinking a saw is powerful, but you have to consider cut speed too.
The mods include increasing compression and adjusting the engine port size...
The 150 does have the advantage of the slower cutting but much thinner .043 1/4 pitch chain which can be adapted to the 2511t. I personally think the size of teeth they use on the .050 chain that comes on the 2511t is way to big for 25cc. It works much better, best actually with .043 3/8, it's...
I heard they've lightened them a little: 8.2lbs instead of 8.6, but one source says a 200t is 7.7lbs. I kind of like the mtronic, it gets good power once it gets the tune right. And the 201t can be upgraded to a 7t sprocket instead of 6t.
But yea, it's heavy :)
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