hi guys, ive got a bone stock 79 exciter 440. got this snowmobile about 4 years ago and went through the entire thing. my problem is it dosent backshift worth a darn. cruizing at 40KPH and floor it, it just boggs and takes off slow. it goes like crazy other wise. the secondary isnt sticking and primary isnt worn. im guessing i may of got the preload on the secondary spring wrong. any thoughts. thanks