OS MAX 105 rebuild part 1 of 3

Part 1 of a 3 part series on rebuilding and upgrading a OS MAX 105 HZ to an HZ-R
In part 1 I go over disassembly of the motor, removing the front and rear bearings and installing new ones.
Special thanks to Frank Moradiellos and Team RC heli hangout!

[@samsman007]

I use the crank shaft to quickly and easily install both bearings WHILE it is hot. NO knocking needed!

[@jp-spain]

hi I have been told that the OS 105HZ R engine with pump breaks more plugs than the OS 105HZ Engine.
Is it true?

[@FreeFallRCPodcast]

I personally don't think so but every person's adventure into Nitro is their own. IMO both HZ and HZR is super dependable and reliable with a mild tune, run it on the edge then it'll produce a lot of power but won't last long.