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DHM Reflash and Camshaft Package (Stage 2)

ECU Core
Camshaft Option


***Update 6-3-24, The Decha HR camshaft has been added as an option. It provides the same gains as a TB or DCR R2 but with a different lobe design that is not as noisy due to a larger base circle diameter. 

***If you already own an aftermarket camshaft you can still purchase our Reflash for those mods here:

****DOES NOT FIT THE 2022+ HONDA GROM/MONKEY, for the 2022-2024 model, click HERE

If your Grom already has an intake and exhaust, this is the next step!

We've created a camshaft package that allows you to add a Decha HR or TB Parts camshaft and our DHM Reflash to your bike. This will add as much as 2-3hp and will also increase your rev limit to 10,000 rpm, while also correcting the fuel and timing tables in your ecu. Your Grom will experience much stronger high RPM power, 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
13+ HP depending on your intake and exhaust setup
10,000rpm rev limiter
Normal cold start functions (no bad idle issues when cold)

DHM Reflash (more info here)
TB Parts Camshaft or Decha HR Camshaft

***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 $50 credit or keep it as a back up. 


Cam Installation:

Customer Reviews

Based on 266 reviews
Joseph Shimek
Fast service

Shipped fast. Install was easy.

Keystone Detail
Love this kit. Installed was very easy and added a ton of power.

This cam and tune really wakes the grom up in the top end. it does sacrifice a bit of bottom end power however is more than made up for in the high end rpm range. Next up is a big bore kit!

Matthew Callihan
2017 Grom

Changed out the cam the day I got it and plugged the ecu in and started no problem. I'm more than satisfied with the performance the cam and tune gave the bike.

kevin cram
2014 OG

Definitely 5star feedback on performance...made a couple of mistakes tho
1. The video says .004 and .007 valve lash...dhm says .003 on both. ( should've read directions)
2. Didn't know you couldn't run a baffle. Live in a quiet neighborhood so there's that...working on boring holes out in baffle. And yes it makes a huge difference between in or out!

It was definitely worth the upgrade 100%!!!


Fairly straight forward and easy install first time ever doing something like this and went smooth and definitely see the performance increase i’m very happy with the outcome and that 10k rpms is next level