spark plug

[RonPlanes]

http://www.sparkplugs.com What is the best plug for my echo converted engine

[rcign]

Anything that fits in the hole with an "R" in the number..
Champion RCJ7Y, or RDJ7Y if the head takes an angle seat spark plug..
NGK BPMR6A or F
Bosch WSR6F
They all work the same...