Hello guys I just installed a 2010 skyhawk 66cc slant head kit on one of my bikes as a play toy. it is on a Trek 820 mountain that I converted to a single speed road bike several years ago. I was trying to found little free upgrades and came across this site. I just got mine running today and it was a blast. tonight I got the "mod" hair up my rear and took the catalyst converter out of the muffler so it is essentially straight thru now. I cannot give feedback because it is 3am my neighbors may not appreciate it. Tomorrow I am going to go pick up a NGK plug for it because I have already had the china plug foul within 2 test rides. so far though I really like it and have had a blast 3 of my biking buddies came over to check it out and all of them had the same grin ear to ear when they got back to the house!