Don't just run the rack wide open... It'll be too much fuel and actually a loss of power. Your rack is probably set around 8-10 range... I don't remember factory setting... but wherever it is is where it needs to be unless you can provide more air.
The .125 overbore increased your cylinder volume 4% so 4 percent of the total fuel required prior is about half a line on the rack. (That's assuming about 10 setting before so 4% of 10 is .4 of a line increase.)
Head work and bigger valves... changes in your filter... could get you more air and allow for more fuel... which will get you more power.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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