you must get this alot but i have a 125-150 not sur lol the gears are 1-down 3-up no revers it has poor power bottom end and i can frash it in second but when i put it in thered it stays the same almost need help
ENGINE
125-150
standup engine
1-down 4-up
if it helps i will get the engine number down
where can i find it thanks
SORRY TO BE A PAIN

 

sorry man i have no idea but it sounds like it has a bike engine and that its geared wrong so that it dosnt have enough torque in first for take off.
as for the engine number, that should be on a metal plate located somewhere reasonably visible possibly on the clutch if its a manual.
hope this helps
and happy christmas