Hello everybody I have a little problem with my prim
here is the spec
full small frame primervera
135 Malossi with reed
25mm delorto carb still in the orginal place under the seat
ported / matched barrel and case opened up a little
pk racing crank flywheel
Sip down and forward exhaust
Here is the Problem
I recently brought the Sip Evo Down and Forward exhaust WOW its like a differnt scooter a real pocket rocket BUT with performace you get problems the scooter now goes like s**t through 1st 2nd and 3rd unless you rev the nuts off it in 3rd when you put it in 4th is starts to slow down so you can do 65mph in 3rd change up into 4th and the sped goes down to 55mph. with the old exhaust it never pulled much in 4th but you would be able to go a bit quicker then 55mph Please Please help.
Thanks in advance.