So I've been searching for top speed on my built predator 212 mini bike. Current gearing is 17X75 and fastest I can get is 59mph that's about 6300rpms. My buddy gets on the bike and goes 66mph with no changes just rider. I weight 230lb and he weights 130lbs. Could the 100lbs really make that big...
Running 93 octane fuel also tried a 1:1 with 110 but didn't change anything. Piston to valve clearance is at .130. When I installed the cam I clearanced the crankshaft and lapped the valves. Spark plug is a racing AR3910X.
Had a mod 2 cam installed when I hit the 6,700 since then I removed it. I'm going to reinstall it now with the head shaved and see if there's a difference. I ordered a new muffler to replace the lawn mower one.