The phelan coil on the Ryobi is rather weak in the spark department anyway. you will be lucky to get a blue spark from it. You will have to keep your plug gap correct @ .020" and the coil as close to the flyweel as possible without it actually touching.

TK
The 32 McColloch piston and cylinder I got from you guys works really nice. It makes a whole lot more RPM than my Stock one. The one from you was cut down at the base.

Good luck

Jim