my advice is go Novarossi top quality ,reliable ,more power than what you would ever need,and long life span.

shim the off roads at about .8-.9 use a novarossi C6TC OR C6T7 depending on the temp at the time or even the oddonell plugs work well .

Your engine will flame out depending on your shiming and thats 100% sure ,also use quality fuel.

we ran a test on the novas here in Australia and ran all sorts of fuel .The ones that worked best were the mecano,runner time and sidewinder no problems with tuning whatsoever and no flame outs.

some of the other fuels didnt tune or work at all.


just my two cents worth