Monty,
Modded N21R ran very nice thru morning and untill steering servo went bad after 2nd qualifier. No problems with engine and ran with very good controlable power. Today added 0.1mm shim, ran 9853/41021 , hot plug, steady 250F temps. Plan to replace steering servo before Thursday night practice and race again next Sat. Found the power band very steady and comfortable bottom thru top end. End resulted same lap times the D8 with modded N21R as my backup buggy MBX6 + B5/2013 combo. Again, Very steady smoothe running engine

Thanks! Talk again
RayAracing