80cc stock engine top speed problem

That ice racing is awesome! That looks so fun! I'm down here on the Gulf Coast so, snow is rarely ever seen. We freak out if it even accumulates on the ground and that's IF it snows. LOL
 
I'm going to take my son's cylinder off this weekend and try to do a little match porting. Should be fun. :)
 
Update: Cleaned up the transfer ports from any spurs or pieces of metal that were obstructing air flow with a dremel. Did the same with the intake and exhaust and made them a little wider on the inside. Put the piston at TDC and marked the bottom of the skirt that was showing in the intake window and cut that part out for faster airflow. I also filed a small slant in the piston head where the transfer ports and exhaust ports are. I got a little more top end speed and seems to have more torque. :D Still bogging at WOT even when starting off but, I think that's the main jet. I'm going to try some different size Main jets to see if it will clear that up.
 
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