That's what they do on 4 strokes but I've heard of no proof that 2 strokes benefit from pointing them to the intake side. In fact I've heard the opposite as some jetski racers point them to the exhaust side on their 2 strokes with supposedly good results. Personally I don't think it matters and you'll get a lot more benefit from running a better plug like the EYA's that sit deeper than the ECS plugs.brax4x4 said:Index mark the open side of the electode. You can buy shims at some speed shops. (High performance engineering) Then set the index to point towards the intaked side of cylinder.