Vader 141cc Big Bore & Grom Parts Comparison

We install a race cam and 141cc big bore kit in our Boom Vader engine. We also discuss some of the differences we found along the way between the Vader and Grom parts. Seems like the Vader is a performance version of the 125cc engine using a carburetor instead fuel injection. We also show some before and after laps on the track!

If you are interested in performing these upgrades on your Grom or Vader, below are links to where we found information and parts. If you want these performance upgrades but don't want to tackle the work yourself, you can reach us at [email protected].

TB Parts 141cc big bore kit.
https://tboltusa.com/store/tbparts-14...

TB Parts Race Cam for Big Valve Heads
https://tboltusa.com/store/tb-race-ca...

TB Parts Big Valve kit. We didn't use these on the Vader engine because these valves are not bigger than what came stock on our 2020 Vader and the valve springs are not stiffer.
https://tboltusa.com/store/tbparts-bi...

MiniBikeAction video with Vader cylinder head information.
   • Vader 125 Honda Grom clone prep for T...  

Excellent Partzilla video with John showing how to install a big bore kit on a Honda Grom.
   • Honda Grom Top End Build | Honda Grom...  

Source for the block off plate we showed and various other parts for our bikes.
https://www.steadygarage.com/store/nc...