We did a few upgrades on Damon's go kart so we wanted to put it up against my stock predator 212. It rips! Next we are advancing the timing 8 degrees and we'll see the gains from that.
Why bother with an air filter? Just bolt on a velocity stack, the engine is disposable. During a HF special, the air filter kit will cost more than a replacement engine. Just get a couple. 20 years ago I built a kart with a real Honda 6.5, and even when the engines weren't cheap, the racing crowd was running only velocity stacks. So, the bell-mouth intake spacers were cheap & that's what I did. (1" thick alluminum donut to replace stock intake, works with stock carb studs after removing the plastic air filter housing)
@1:42 I saw the can and I first thought, "whatever that is, (welding) spatter is going to make that taste nasty!" Then I saw it is a Miller Light...it's not getting worse, just different.
