Got the motor back from RCR and looks all good and stuff. Put it back together with the 488 sled piston he let me choose. I have always ran a NGK B8ES, now I read some where that a hotter plug is a good idea when running higher compression. The heads been shaved and Im not sure if the sled piston will effect compression but rick told me I should be around 140 psi when all together. Im not even sure if thats high compression but its better than 110psi.

Its a 250r/es Scrambler Air cooled .020 over wesico
Runnin 93 Octane with Klotz Techni-plate oil 32:1
Stock Coil and CDI, DG Exhaust

 

thats not real high compression, more close to brand new. running w/ shaved heads will change it for sure. what did rick tell you to run? dropping 1 plug number could be alot hotter then you want so i would ask him(the expert) for sure before you do it. are you running the 93 octang because of the shaved heads?

 

I run 93 because I have always run 93, I guess cause its when I get gas i put it in a gas can after I fill up my car, My car requires 93 and since the pumps already set then the can/bike gets 93 too.

 

in most cases the higher octang is wasted in regual engines. unless your running at 10 to 1 compression. w/ the plane heads and hotter plug you would be running hotter heat for sure i would think. maybe rick should be telling you what is best here, or someone w/ race engine savoy.

 

When you raise the compression you need to run a COLDER plug. You definitely don't want to run too hot a plug with an air cooled 2 stroke.

 

Mine is at 12:1 and HPD and RCR recommend 92 min octane.
My machanic said to try the BR9es plug.

I'm running the NGK Iridium BR 8 EIX , it makes a difference (in fouling).

Jim