Originally Posted by bigmatt

that sounds like a gen 4 go-tec.the shim is for break in. do you have 2 head buttons? if so use the turbo with a os-p3 glow plug. You will need to take apart and seal the carb base and backplate. get yourself some nitrile seals for the carb needles,those will go fast and a new conrod for after break in. the engine was based off of novarossi's and it is a great engine. I have 12 gallons on one of mine. when you take it apart clean the whole inside with nitro cleaner then reoil with some after run oil. you should be good to go. seeing a pic would help. On all of my earlier go-tecs I use the 5.5 carb it has the red go logo on the front of it.