had this out yesty , put over half a ltr through it in 1.5hrs non stop . i took out the 5.5mm CARB restrictor from the ninja .12 carb , OMG this lil engine opened up . had a extra power-band now (way up top) . took abit to get there but when it did it flew!. just a lil boggy down low ,ya need to not give it to much throttle down low . but with the extra RPM's the motor is doing with the massive carb and short on-road top-end header and pipe , i think im wearing out the lil RTR engine very fast lol. the engines only seen about 2-2.5 ltrs and its getting less and less comp . still go's good as but , not much comp now . engine was not made for the rpms its pulling .
dunno wat engine to go for next .. ?