The motor kit seller's ad says these kits will reach 35-40 Mph after the motor is broken in. I've gone through a couple gallons of gas and have taken the bike up to 28 Mph. Is 35-40 mph realistic without modifications or is this just a way to sell more motors. If these motors do reach 35-40 mph, how many miles or tanks of gas do have to go through to get to 35-40 mph? I weigh 160 lbs. and my motor kit is installed on a Micargi beach cruiser. (I was 177 lbs. but I completed the P90X workout program). Thanks, Sparks.