125-200cc What is the best i can do to a WR125-08?

Hello guys! Well, i just bought a WR 125-08 to my son and now i wonder what is the best mod to do with it. It runs strong, but it has a bog when i give full throttle. It´s not that strong from the bottom, but i think i read somewhere that there is some mod to do, but can,t remember what. Now there is a HGS exhaust system on it, but it,s guite dented, and the standard system is on the side in a box, but i think that one is with a catalyst in it. can i use this or will it rob too much power? The bike has the standard carb.

Regards

Johnny

Any pipe is better than stock. 4.0 carb slide . 12 tooth countershaft sprocket. Remember that it is still a 125.

Ok. It,s a HGS on now, but very dented. I thought of jetting, but i ask in the jetting thread so welcome to give advise there!

Johnny

Un bolt the engine and ship it to Wallybean. He can build them, small (125) medium (144) and large (167).

He can turn it into a rocket!

No, seriously, take a good evening, put a pot coffee on and read the 125 thread MattR compiled from all of us.

Unless ur kid is 200lbs all u need to do is jet it and let him learn to use the clutch. Before long he will be wanting a 250 or bigger.