I am going to buy a couple more sets of spark plugs for my Proclimb and M8. I notice on my M8 at some point I switched from BR9EYA over to NGK BR8EIX Iridium plugs. I remember reading at some point that they were less prone to fouling. I hunted both forums (Proclimb and M Series) for a post that would have pointed me that direction and can't find one. I know I have had great luck with BR8EIX plugs but, before I buy some more I thought I would ask what what plugs you guys might be running other than the manual specified BR9EYA plugs?
Also, I saw a post on the M series forum that suggested using Autolite XS4063 Xtreme Sport Iridium Enhanced Spark Plug. The poster "Clutchweight" claims:
"I've been running Autolites for a few years now. The XS 4062 is equivalent to NGK BR9's. They produce 2.5 to 3 HP more than a BR9ES or and EYA. They are hard to read without cutting the thread off and looking for the ring on the porcelain. Many racers use them".
I haven't tried them, has anyone else?
Also, I saw a post on the M series forum that suggested using Autolite XS4063 Xtreme Sport Iridium Enhanced Spark Plug. The poster "Clutchweight" claims:
"I've been running Autolites for a few years now. The XS 4062 is equivalent to NGK BR9's. They produce 2.5 to 3 HP more than a BR9ES or and EYA. They are hard to read without cutting the thread off and looking for the ring on the porcelain. Many racers use them".
I haven't tried them, has anyone else?