5500 rpm nets you a top speed of;1st=41 ////// 2nd=63 //// 3rd=91 /// 4th=111 /// 5th= 153
you should be shifting into 3rd after 4 seconds?
what carb are you using? what is the model number?
if you changed to 3.73 gears,then your speeds would be;
1st=34,,2nd=52,,3rd=75,,4th=92,,5th=126? That would be silly.