Cone plugs are for motors designed to have a cone plug with no washer.
Pro plugs are long reach plugs designed for our West engine range. They have increased rpm over normal Japanese plugs.
Heat range:
No. 2 – hot – for low nitro in engines from 0,8 to 4cc
No. 4 – hot – for low nitro in engines from 4cc to 10cc. Recommended for the West “T” motors which produce high torque and lower rpm.
No. 5 – medium – for nitro fuel from 3,5 to 6,5 cc
No. 6 – medium – for higher nitro fuel from 3,5 to 10cc
No. 7 – cold – for higher nitro, higher rpm motors – recommended for the West “V” motors
No. 8 – cold – for higher nitro fuel from 10 to 15 cc
No. 4T – longer nose glow plug for 4 stroke engines. This fits further into the chamber on a 4 stroke to keep it glowing longer at lower rpm (because a 4 stroke fires every other rev.)
