Originally posted by au_Nightmare
as wangcc61 said run the copper one, earlier instructions said to remove the silver shim and thats what I did (though I got here in my notes its .2mm ?)
I just talked to Dino on MSN again. Sorry for the previous post. The copper shim is 0.2mm and the silver shim is 0.3mm. Dino confiremd that. Dino also did not suggest removing the silver shim. He said at least keep the silver shim in the engine. If only the copper shim is installed in the engine, the piston might hit the bottom head....
The head shim is to adjust the compression ratio and ignition timing. The silver shim is good for 16% and 20% fuel in my opinion. All you need to do is to choose a hot plug for 16% fuel. No need to reduce the head shim, especially when the engine is new.