I just ordered a aftermarket cdi and a pipe fo my sons 02 scrambler 50. Iwas wondering if any one knows what jet size I should start with after I put the pipe on. Any other tricks would be appreciated

 

what pipe ?

 

I bought one from 2-stroke connection. It's a one piece exhaust, I got it for cheap and figured anything is better than stock. I've already moved the needle up one click, it takes off great and runs strong all the way till it hits the rev limiter. So I ordered a non limiting cdi. Should be here monday so I'll see if it makes as much difference as everyone says.