The gear ratio is determined by dividing the circumference (or number of teeth – if chain drive ) of the driven pulley on the transmission or drive axle by the circumference of the drive pulley on the engine. The usual range is between 3:1 and 5:1 only by experimentation can you determine the best choice for your cart. A numerically higher ratio will give faster take off and a lower top speed, a numerically lower ratio will result in slower take off, but up to a certain limit will give a higher top speed.
the engine has nothing to do with the gear ratio, it’s all the size of the gear on the rear axle that determines that.
The gear ratio is determined by dividing the circumference (or number of teeth – if chain drive ) of the driven pulley on the transmission or drive axle by the circumference of the drive pulley on the engine. The usual range is between 3:1 and 5:1 only by experimentation can you determine the best choice for your cart. A numerically higher ratio will give faster take off and a lower top speed, a numerically lower ratio will result in slower take off, but up to a certain limit will give a higher top speed.
GET AN RPM GAUGE FOR THE CART