Tricks of the trade

[unit_mx]

Smoothing out the castings improved flow = improves throttle response.
Irk will decrease your engine lifan as the motor is reving out harder however its in balance with reducing the weight placed on the crank.

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Check out this article:

Dirt Bike Mods - Pit Bikes, Mini bikes, MX Bikes

Very very good reading!!!

[Shroomin]

would i need to tune my bike after these basic mods, i dont see why i would have to.
cheers
p.s great link unit

[unit_mx]

No you should be right mate , I didn't need to so it should run fine.
Hope that helps

[motoXXX]

i cleaned my exhaust manifold up (smoothed it out) and it ran like poo you may have to tune it cause of the loss of back pressure which may cause a bog when throttle is open wide straight away...