The smaller the pinion, smaller speed, smaller heat buildup. Larger the pinion, bigger speed and more heat.
A larger pinion will also reduce acceleration and run times. These statements are "generally speaking"
If you change the spur gear, the changes are opposite. Smaller to go faster. The changes are less noticeable, too. (A one tooth change on a pinion has a much bigger effect on your setup than a 1 tooth change on the spur)
Any time you are messing around with gearing changes, especially if they are a huge change to your setup (like, say, going from a 12/50 to a 15/50) you should get a digital temp gun to monitor your temps. The wrong setup will kill your electronics if you aren't monitoring temps.
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