DHM Performance ECU Flash for the 2022+ Honda Grom / Monkey

DH Motoring

Sale price $159.00 Regular price $199.00

Shipping calculated at checkout.

Customer Reviews

Based on 17 reviews
bret simpson
Cam & ECU tune - 22 Monkey

Great service. Friendly, helpful, good price and fast shipping.
Most of all when looking for the items I was really trying to find "in stock" items but after 3 very trusted and independent friends all recommended DHM it was a no brained. DHM it was 👍🏻

Sean Banville

Intake cam and exhaust just did the reflash and it feels like a completely different power thru out the whole Rpm range.

Evan Lundberg
Good value, super fast turn around

Really great value and super fast shipping my ECU to and from Florida. I'm definitely way more happy with the ECU flash method than spending all the money and time on a power commander. Plus they have a good variety of modifications you can choose from to have your ECU flash match what you've done for your bike.

Raniel Mac
Ecu re-flash and tune !

Hands down, a necessity if you are looking to really take advantage of the potential that has been left untapped in the Grom’s power. Supporting the bikes modifications with a tune was the best bang for the buck. The bike is alive in the flats. Especially if you’re on the heavier side of things, pairing your intake and exhaust with the tune alone makes a noticeable difference. Excited to have the cam installed next. RunDHM !

Wayne Parent
Great tune!

Now runs like it should! Fast turn around time as always!

After months of development, we're now offering ECU flashes for the 2022 Honda Grom and Monkey!
The 2022 engine doesn't run as lean in the lower RPM as the previous generation, but still runs lean at higher RPM once an intake and exhaust are added. Honda was also very conservative when mapping the new bike, and has left a bit of power and throttle response on the table. As seen in the dyno graphs, we've been able to pick up quite a bit of mid range power and we've also smoothened out the awkward power hiccups that the stock mapping had. 
The DHM ECU Flash modifies the following:
  • Fuel mapping - we remap the entire fuel table to help your bike run safer while also making more power than the factory mapping. We can maintain factory fuel economy at part throttle while also making sure the bike runs safely and effectively under load. Fuel mapping is essential to keeping engine temps down.
  • Ignition timing - we modify all spark angle maps to increase throttle response and power while keeping temps down. This can also help with fuel economy at part throttle, while allowing gains across the board when under load. We've altered the timing to eliminate the factory power dip around the 5,000rpm mark.
  • SOI - Injection timing is modified to make sure that fuel is delivered at the most precise moment to increase efficiency and power. 
  • EOT Tables - We alter engine operating temperature tables to make sure the ECU compensates for high engine temps. This failsafe helps prevent engine damage when extreme temperatures occur.
  • Optional - Tip sensor delete and Cold start delete.
We have maps for nearly every combination of intake, exhaust, and cam, and are currently updating our library daily. If you don't see your mods listed, feel free to inquire, we may just have a setup for you. 
We currently have maps for the following exhausts: Yoshimura, Hindle, Vance&Hines, Anodized Racing (Amazon), Over High mount, and the Zoom loop and Brute.
We have maps to work with the following intakes: Chimera, MNNTHBX, Airbox mod, and Dinger Short and Mid.
We can map for the following cams: DHM S1 / CJR S2, DCR
Our S1 cam for the 2022 model can be found HERE.
ECU updates will be free until further notice. So if we release an update to this flash, you can send your ECU in for the free update, you'll just need to cover return shipping.
New ECUs are not yet available from Honda so we aren't able to offer preflashed ECUs at the moment. We will be offering this option as soon as they are available.
***After checkout, you will receive an email confirmation that will include shipping instructions, as well as a link to an online form that will ask for your specific mods.***



  • Orange: Bone Stock
  • Green: Stock with Yoshimura Exhaust
  • Purple: Yoshimura Exhaust and DHM Flashed ECU
  • Red: Yoshimura Exhaust, Intake and DHM Flashed ECU

  • Blue: Stock 
  • Green: Chimera Intake, Yoshimura Exhaust, DHM S1 Camshaft, DHM Tune