Originally Posted by
ralphierace13
sorry i should of said it this way its set for 16 using the shims or the button head is made different?
because its the same shims as i always had since i started using os with the black head for years since it first came out.....?
thanks
Our head-button has a different shape(volume) and to use it with 16% nitro we use 1 copper shim(0.1mm) and 1 aluminum shim(0.15mm)
On short tracks you can try to take our the copper shim to get more low-end power but you will then also have a higher fuel-consumption.