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DHM Stage 2 Flash and S1 Cam Package (2022+ Grom / Monkey)

ECU Core


If your 2022-2025 Grom/Monkey already has an intake and exhaust, this is the next step!

We've created a camshaft package that allows you to add our S1 camshaft and our DHM Reflash to your bike. This will add as much as 2-3hp and increase your rev limit to 10,000 rpm, while also correcting the fuel and timing tables in your ecu. Your Grom will experience increased power across the entire rev range, as well as the ability to pull to higher RPM before shifting. After tons of dyno and street testing, we feel this it the best bang for buck upgrade available! 


  • Corrected Air/Fuel ratio for your exact modifications
  • Increased ignition timing for throttle response and HP
  • Modified injection timing for ride ability and response
  • 13+ HP depending on your intake and exhaust setup
  • 10,000rpm rev limiter 
  • Normal cold start functions (no bad idle issues when cold)


  • DHM S1 Camshaft
  • DHM Reflash for the S1 camshaft and other modifications

***Each tune is catered to your exact modifications (intake, exhaust and cam brands, etc.) After checkout you will receive a link to an online form that will ask for your bike's exact setup so we can tune it accordingly.

You have two purchase options for delivery. Once you've completed the purchase, we will email you with instructions on sending your ECU in to be reflashed. You can also choose to purchase a core ecu, we will send you a flashed ecu and you can return your original one and receive a $75 credit or keep it as a back up. 

Cam Installation:

Customer Reviews

Based on 83 reviews
Grant P
Fantastic Improvement

The S1 cam and ecu flash, along with an intake and exhaust, made a huge difference on my 22 Grom. David was quick to answer a question I had, and install went quickly and easily. I can make full use of the RPM range now without power falling off, and I picked up 10 mph for top speed along with the ability to lose less speed on longer uphill sections which was my original goal. The flash runs perfectly. Can't recommend this combo enough and will definitely be doing business with DHM in the future.

Jesse D

Quality parts, packaging, service and company. Highly recommend for all your mini moto needs.


David & co are the GOAT of this mini-moto world!
He has gone above and beyond to answer my silly questions and helped me get to 80 mph true gps!
2022 grom with over 14k miles now all thanks to Mr. David!
You’re very well appreciated in this community my brother!
Hope to meet you next year!
Continue to be great!

Michael Howell

So far it's great ! Def an upgrade over stock

Sami Masri
Definitely What My 2025 Grom NEEDED!

If you're thinking about it.. trust me.. DO IT, its the perfect "wake up" the grom needs without going the bbk rout. no issues after install, everything went smooth, although i did buy the special wrench to adjust/loosen the valves, they do state in the repair video that you don't need to but made the job easier. would be nice if they offer the wrench to add to the kit as an option would be nice.