Cris:
I have converted the 41 on two occasions......The update is a Walbro #144 carb, or a Walbro carb of 13.2 mm..You must also toss the restricting can muffler..I use the B&B muffler and it made a big difference....I also use Poulan synthetic chain saw oil at 40-1..With these changes you can pick up 4-500 rpm...These little engines are super reliable..