The narrow rings are good. Less friction and less ring flutter at high rpms.

You would be hard pressed to find a better deal than the one for sale in the market place. Even if you count your time at a buck an hour you would come out ahead. Just the custom two needle Walbro carb, the ignition sensor, the Twister Manifold, and the prop hub cost close to 100 bucks..... The whole engine with all the mods is only 150 as advertised....

AV8TOR