AutoliteAR3910X High Performance Racing Non-Resistor Spark Plug, Pack of 1

works great with 212 predator hemi/non-hemi. great for if you have a longer connecting rod + piston head setup like me so the spark plug doesn't hit the piston head. very easy to install and no more gapping the spark plug. gives a strong spark to all four corners of the plug. have a few of them now and will continue to buy them in the future.

More power

Quick starts and excellent performance on Honda GX390 engine.

Great for 212 mini bike

I notice the throttle is more sensitive with this spark plug, runs great

It worked in my Westinghouse generator but even when tightened, slightly wiggled. It's as if the threads were slightly too small. It sealed, and didn't come out, but still wiggled side to side in the socket. Not a size too small, but just enough to fit.

I can’t tell a difference in performance but they last much longer than traditional spark plugs. I put them on a 196 Hisun and a 212 Predator

use the plugs in mini bikes and gokarts using the 212 predator engines. They seem to last longer than the stock plugs