I have a 150 cc scooter, if i replace my CDI with a racing brand and the rest are just stock parts ..,?

will it speed up my scoot.?. does it have any dis advantage if the rest are still stock because thyre all still working well...thanks

what do you consider fast?

it will not make your bike go faster.

Gernerally, a 150cc is fast enough for the streets. If you are looking into racing, then you had better look at buying another bike. However, here are some tips that may be able to help you.

1. Dont replace the CDI, just cut the pink wire that sends signals to the back tire to back up when it reachs the optimal speed. If you cut the pink wire, the signal never reaches the back tire; thus, you will be able to go full throttle.

2. See if you can upjet the Carb by replacing the Main Jet with the next size up. However, if you are able to do it, you will have to readjust the Carb to allow for all of the extra fuel. If not, the bike will either cut off, or blow back.

Again, a 150cc is not really designed to race with. What I explained above will give you 10 to 15 more miles per hour on the top end. Now, if you want to the top end faster, look at replacing the 6 Rollers inside the CVT with the next size down on the Grams.

Happy Riding and Good Luck

I put a race CDI in my scooter with stock engine, and there was no change in top speed. Acceleration was smoother though.

i recommend taking your cylinder head off and have it milled so that youll have higher compression.
next get a bigger carb
and then good gas