Tractor Pulley

Lawn Tractor Pulleys?

I want to change the pulleys on my lawn tractor to make it go a bit faster. Currently I have an 8 inch in the rear and a 2.5 in the front. If I make the rear a 3 inch and keep the front a 2.5 will I see a speed increase? I'm not sure whether the front has to be larger or if simply shrinking the rear pulley will show a speed difference.

You would see a dramatic increase in speed if you put a 3" pulley on the back. You would also see a dramatic decrease in torque. With that small a pulley on the back, it would be close to a 1 to 1 ratio with the engine which would probably change your 1st gear into high gear.

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