DH Motoring

Sale price $105.00 Regular price $149.00

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Customer Reviews

Based on 213 reviews
LeRoy Crosley
2022 Monkey Flash

2022 Monkey with Yoshimura RS3 full exhaust and MNNTHBX 2022 intake. Much improved acceleration through out throttle range. Smooth and strong response. Top end gain to easy 68 mph. Very happy. Great people to work with.


It’s winter here so I can speak only of service; fast, friendly, and very helpful!!!

70 mph on stock internals

stock form i barely could hit 55mph downhill in a full tuck. once i added the tune i can hit 70mpg gps confirmed with stock internals and a exhaust only. the chimera intake gives it more felt torque off the line-mid range but even with stock air box i was still hitting 70 mph. pushes every bit of power out of the stock cam/ gearing

Frank Charboneaux
Franks Honda

Great low to mid torque. Off idle cruise smoother than stock. I’m running a DNA air intake with my brute exhaust. All the way thru 3 rd gear to 50 mph 4 th limited getting 2/3 Throttle. Not much happening after that. Top speed with 14 tooth front sprocket is 63 mph so far. Overall a very good experience. I would recommend this product.

Ryan Wofford
Easy and fast install, noticeable power gains

As long as you read the instructions, it is a simple plug and play install, would recommend

**Mail-in ECU turnaround time is only 1-2 business days!

**Any OG ECUs that are in stock are used cores, available for purchase

DHM is here to offer you the original flash tuning solution for the Honda Grom / Monkey! Our stage 1 software cleans up the air/fuel ratio and optimizes ignition timing on bikes with intake and exhaust modifications.

Looking at the dyno graph, you'll see the blue and green lines that are the graphs for the stock, unmodified ECU. It runs extremely lean up top and therefore only makes around 6-7HP at 9200rpm. By controlling the air/fuel ratio we're able to extract up to 3HP more in the higher RPMs. The peak number is only about 1hp but in a race on the street the tuned bike will continue to pull gear after gear because it does not lose power after 7,000rpm.

Our ECU flash not only increases horsepower, but it also makes the engine run safer now that it has adequate fueling.

***This is the best alternative to a fuel controller, especially at the price point. You no longer need to spend hundreds of dollars on a tuner if you only have simple bolt-ons on your bike. If your bike is running a modified intake and exhaust this is your ticket to a smooth running bike with OEM like ride-ability. Since we retain the stock ECU, the bike will start, run and idle like normal, but will produce more and safer power throughout the rev range.


  • Up to a 3HP gain at high rpm compared to an untuned ECU!
  • Raised rev limit of 10,000rpm (compared to 9250rpm stock) higher limits available upon request
  • Corrected air/fuel ratio
  • Additional ignition timing advance for improved throttle response and power
  • Revised fuel injection timing for better atomization
  • Higher top speed
  • Better mid range and torque
  • Optional tip-sensor delete
  • Optional cold-start high idle delete
  • Optional closed loop delete (will allow your piggyback to make changes to the closed loop portion of the map)

Available Tunes:

  • Stage 1: Intake and Exhaust mods
  • Stage 2: Intake, Exhaust and Cam
  • Stage 3: High Compression Piston, Intake, Exhaust and Cam

For big bore tuning, click HERE

***Once you've completed checkout, you will receive the shipping info as well as a link to a form so you can list your exact modifications. Each tune is tailored to your exact modifications!

How to order: 

You can mail us your ECU and we will flash it and get it back in the mail by the following business day (1-2 day turnaround time). (After checkout you'll receive an email confirmation with shipping instructions.

If you do not wish to have the downtime, we can provide a core flashed ECU to you. You will have to pay a core charge ($95 for SF and Monkey, $110 for OG) which will include a preflashed ecu. You can choose to return your stock ecu for a $50 core refund after you've received the new one.  

If we revise the stage 1 software in the future we will update your ECU for free (you just pay shipping both ways). If you'd like to update to a different setup later on (big bore, cam, etc) we only charge a $35 upgrade fee which includes return shipping to you as well.