Hey guys just need some help I have a 2001 blaster and i just finish putting a new piston in 0.20 and bore it out but now when i start it i ge popping sound (back firing) and then my blaster will start to over heat the muffler gets red....I checked the reeds and the look fine but just to b safe i bought new ones and put the on also redid the mixure cleaned the carbs the only thing I could think of is that the timing is of the quad was running fine before I ha to replace the pistin any ideas.