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DHM Stage 3 Kit for the 2022+ Honda Grom / Monkey

$450.00
by DH Motoring
ECU Core
Camshaft

**Professional install is highly recommended. Ring gaps must be set, and base gaskets must be installed properly. Setup sheet is included. 


The DH Motoring Stage 3 Package includes the following:

Combined with your aftermarket intake and exhaust, this is the most you can get out of your Grom without doing any head work. After dyno testing we were repeatedly seeing 13hp at the wheels (SAE) run after run! The Stage 3 package makes more power than a stock Grom at every RPM and double the horsepower at 9000+ rpm! 91 octane fuel is absolutely required. Any fuel with a lower octane rating may result in engine damage!

You can choose to receive a preflashed ECU instead of sending yours in or you can send yours in to be flashed. 

An oil cooler and extra crankcase vents are recommended for this kit. 

We offer the following crankcase vent systems:

AvailMS Crankcase Vent 

MO Power Crankcase Cover

Oil Cooler Kit: Kitaco x DHM Oil Cooler Kit 

Customer Reviews

Based on 19 reviews
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Denis S.
DHM for the win!

The DHM team is amazing, offering the best premium parts you can find online. I installed the intake, exhaust, and DHM tune, and I was blown away by how well my 2025 Grom ran. Then I decided to push the limits of power without going with a big bore kit, so I pulled the trigger on the DHM Stage 3 — and it feels like a brand-new bike! After my purchase, I was so excited I couldn’t sleep, so I emailed the DHM team to request overnight shipping for my kit once they received my ECU. They communicated exceptionally well, I paid the extra shipping cost, and they made it happen. For reference, I placed my order on Monday, and by Thursday night, I was already installing parts.

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Ryan Mccrea
Definitely worth the money.

I finally got it installed in my wife's bike. After a little troubleshooting and resetting the throttle position sensor very happy with the product and the performance easy install. Thank you, dhm.
Ps if you install this kit and your bike struggles. At around 7000 to 9000 rpms, reset the throttle position sensor.

j
j.t.
dhm stage 2 cam and ecu

hands down the best! installed it on my 25 grom and went to the race track with it ran a 18.36 @67mph in the 1/4 crossing the traps in the top of 4th gear 15-35 gearing by the way and I know it will go faster 😁 thanks dhm you made my grom fun to ride and now the drag racing pit bike begins 🤣🫡

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Austin Goss
Love it

Finished the install yesterday did a few heat cycles last night ripped it around the yard a bit then took the bike to work this morning at 5am. The HP and torque feel higher in the rpm range bike pulls strong up to 10k 5th gear is usable as long as it's not to windy ha but what do I expect from a 125. Wanna get some more miles on it before I beat on it to bad but so far it's a ripper. DHM guys are awesome. I see me making many more purchases in the future.

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Cory

It’s pretty sweet not gonna lie.

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