if u wanna stay 2stroke just buy a f**ckin Suzuki Quadzilla lt500. it show them 4 strokes up
On a worn out 20 year old bike? your going to spend just as much making it good for today's racing and still be lagging behind. Todays tracks are built for 4strokes so your always going to be at a disadvantage.
Don't get me wrong... I'm a die hard 2stroker... but for todays standers of racing you really need a 450 4stroke to race.
i have a blaster and i race in the 200-300cc class. but sometimes i race in the 450 class i never win but i do get 4th or 5th. but you need to get a california big bore kit. it makes the blaster to a big 280cc 2 stroke terror. the only quads i have trouble beating are the KTM 450 xc. but nothing compares to those. hope this helps (Y)