well i did the swap and this engine is INSANE in my savage ! im running 17/49 gearing and i can pop wheelies all day long ! i can sit there idle for like 20 seconds and slam the throttle and pop a wheelie....my bottom arms are level and i have stock springs and stock oil and im runnin only 4 springs all round(2 front 2 back)

thank god i got that wheelie bar but it helps abit not that much it still rides just the wheelie wheel and no truck rims i can do around 2 metres on the wheelie bar wheel without topping over....i have MTA4/MGT rims on my savage with dirt bones squashed onto them and there not as good....they start the wobble at high speed lol i would swap this engine over the HPI K4.6 ANY day and i plan on racing this engine....and it doesnt overheat and i still havnt touched the needles after 12 tanks....its totally MADNESS