[AndyZJ]

You could probably gap it out to .045 or even .05. The thing with gapping is, if the spark can jump the gap then the propagation can begin sooner and this should give you a bit more power. On the other hand, if the system can't handle the added gap, you can destroy the coil, the cap/rotor, the plugs, or have misfire city going on. So experiment a little. I'm gonna gap a little bigger and see what happens to mine.

 

[AndyZJ]

With the gap closer to .1, the propogation of the flame front can begin sooner. The sooner the flame can begin to expand, the sooner it can move through the space in the cylinder and drive the piston down creating power. The thing to remember is that the gap is determined by cylinder design, compression ratio, air/fuel ratio, and a few other things. Messing with it can make your whole ignition system work harder to jump the gap. So be careful to what extent you gap the plugs. I'd start with .005 amounts at a time.