'07 CPI SM50 Won't Start - HELP!

[mweston1]

I have recently bought a 2007 CPI sm 50cc for £400, not starting.

it has compression, it has a spark... the one thing left that i suspected is the carburetor.

what should i do?
do i give it a clean and clean the jet? ( i was gonna do this regardless)

do i purchase a new standard carburetor if this plan fails?
or do i purchase a new upgraded carburetor (dellorto,polini. etc)

if so what size do i get? 19mm, 21mm ..?



IF ALL THIS FAILS AND IT'S NOT THE CARB - anybody know what it would be?!?!?!?! would help loads

also.. for tuning, what i do i got a very tight budget, like $150 lol
shall i upjet main jet? if so, what size?

what else is possible to do that will make a big difference in top-speed/performance for under £150, i don't really wanna big bore it tho...


THANKS:) PLEASE HELP ME!
____________________
Max Weston - 1993 - Full time education
Current bikes: Suzuki SV650S K3 Nicely done, Honda hornet MC31 Japan import, Suzuki GSX-R400 '89
Previous bikes: Rieju RS2 125cc, Generic Trigger X 50cc, CPI SM50cc supermoto, Suzuki RM85 BW, 110cc PIT BIKE.