Dont expect those wheels to be spectacular. I mean they will work but they wobble and scared the crap out of me so i changed. I got ride on lawnmower wheels all around on mine now and there a lot better and allow me to go off road. If ur using it for on road i would get go kart slicks. Im not saying straight away but about 3-4 months u will see what i mean. Mine are still fine but i wouldnt put em on a kart again. When im going 55km/h down the road i dont want to be thinking "is that wheel going to come off" all the time.
Thanks, Ive done no modifications to the engine. I was planning on taking the governer off. But I am happy with the way its running, because the go kart chasis is so light, The go kart goes about 70-80 clicks. So Im happy with it at this stage