Originally Posted by j8ight13

I just picked up the untuned myself. I love it so far! Im going to break it in then switch that brick(conrod) and maybe the crank. Then to a .21 button head and orange head. for my upgrades.

Does anyone run nitrotane with their GRPs? I took my engine apart last night to check on the wear so far and after 5 tanks I noticed that it leaves a dark brown residue on the top of the piston.