Chainsaw Repair

My 3120 only has a baby small 24 inch bar. You would think that it should easily pull a 9T or 10T

Good advice Kevin you have been there and done it.

Depends what species of wood you're cutting down under Fabian. 9T-10T in 3/8[.375"] is possible in softwoods with a unmodified 3120-24", but not in that tooth count in the larger .404
If you don't plan on getting into speed cutting competitions,if only work then keep the .404 setup [rim,sprocket bar nose & chain] The most durable and longer sharpening chain size out there for todays hand held saws.

I am cutting Australian hardwood - red gum, yellow box, mountain ash. I can tell you that dry yellow box has to be about the toughest wood to cut.

When you crunch the numbers, going from a 7T to an 8T is only increases the chain speed by 11.5%
The 3120 should handle that increase like a walk in the park, with .404 chain and a only a 24 inch bar.

Going to a 9T gives much better numbers:   28.5% increase in chain speed over a 7T - a significant improvement.

I'll try an Oregon 8T and see how it goes using a .404 chain.

What is the website and the price for a good 9T sprocket, bearing in mind that i'm in Australia, so would need to include shipping cost.

I'm with Kevin , 9T is enough . I know my 3120 won't gain anything with a 10T even for cutting small softwood .

I'm with Kevin , 9T is enough . I know my 3120 won't gain anything with a 10T even for cutting small softwood .

Where abouts did you get your 9T and what was it worth 

I get all my racing sprockets from madsens in the us . Good customer service ,  good price , I highly recommend them . Only problem is there is a minimum of 300$ for international order . Oh and I the last ones I bought were 23 $ a piece