Tpdingo
Member
Yeah, back to my calculation, at a standstill the ratio will be 3:1, on top of the 4.5:1. That is 13.5:1, and with the added grip, ~6 ft-lbs * 13.5 = 81 lbft of torque. Remember that it takes around 16-24 ft-lbs to move. You won't be smoking clutches, but possibly tires 
You said 10" tires, well we can do some calculations. The kart will move 10" * pi = 31.4" per revolution. 3600/4.5 = 800rpm. 800rpm * 31.4" = 25120in/min = 23.5mph.
NOTE: BEFORE YOU GO FOR A RIDE, CONFIRM THAT THE BRAKES ARE WORKING AND FIRM! I pushed the gas pedal and thought my brakes were good to realize I wasn't slowing very quickly. I had atleast 100ft and I was going no faster than 7mph so not a big deal but you could get hurt if you realize it doesn't work.
It looks like you have a disc brake. There should be nut and bolt on the outside of the caliper. Loosen the nut and turn the bolt inwards until it you can't hand-tighten it anymore. Then tighten with a wrench until moving the kart by hand starts to provide resistance. Back off 1/16 - 1/8 of a turn and tighten the jam nut.(Note: make sure to hold the bolt in place with a wrench as the turning of the jam nut could tighten the bolt, causing the kart to be holding the brakes at a stop and make it hard to move)Confirm the brakes work and release right, and if not adjust appropriately.
You said 10" tires, well we can do some calculations. The kart will move 10" * pi = 31.4" per revolution. 3600/4.5 = 800rpm. 800rpm * 31.4" = 25120in/min = 23.5mph.
NOTE: BEFORE YOU GO FOR A RIDE, CONFIRM THAT THE BRAKES ARE WORKING AND FIRM! I pushed the gas pedal and thought my brakes were good to realize I wasn't slowing very quickly. I had atleast 100ft and I was going no faster than 7mph so not a big deal but you could get hurt if you realize it doesn't work.
It looks like you have a disc brake. There should be nut and bolt on the outside of the caliper. Loosen the nut and turn the bolt inwards until it you can't hand-tighten it anymore. Then tighten with a wrench until moving the kart by hand starts to provide resistance. Back off 1/16 - 1/8 of a turn and tighten the jam nut.(Note: make sure to hold the bolt in place with a wrench as the turning of the jam nut could tighten the bolt, causing the kart to be holding the brakes at a stop and make it hard to move)Confirm the brakes work and release right, and if not adjust appropriately.