tenderfoot57:
PS12 will fit V1R/RR/RR EVO and RRR with enlarge of engine mount holes on the chassis. you will need to widen ~<0.5mm to each mounting holes since PS12 with stock engine mount, the mounting holes are 1mm wider than novarossi or os TR base engine.
Another modification needed on Kyosho V1R/RR/RR Evo: If you use kyosho optional left side belt tensioner + support or from other company with same style, you will need to dremel off material on the tensoner since PS12 will sit 1 mm to the left than other engine.

By the way the carb will clear the upper deck of the chassis without any modification on V1RR EVO with stock or lower engine mount. On V1R/RR with lower engine mount, you are require to dremel the upper deck and support to clear throttle movement this modification is require even with nova/Os tr engine.

TG777:
Any new tuning tricks on PS12? Is there anyway to make PS12 milder? I have chew thru 2 set of spurs and 1 set of pinion after 3 gallons of fuel thru PS12.
Lee