The number of studs directly correlates with the amount of horsepower the sled has. I'd say on average 196 for a 700 cc and above, 144 is good for a 600 cc engine, 96 is about average for a 500 cc engine. Of course there are many variences and it also depends on the pattern you want to use and wether or not you want to stud the outside of the track or not. Many guys will only stud the center of the track, while others stud the center and the outside belts. Let us know what sled its going on and we can help a little more.
I would say that 144 studs would be correct. You may be able to get away with having 96 in the center belt, but i would shoot for 144. You could arrange them so they are all down the middle or so they cover the entire track. You can follow this link to the tutorial i wrote up on how to stud, and also see the pattern i chose.
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