DHM Performance ECU Flash – 2022+ Honda Grom & Monkey (JC92)
Unlock the full potential of your 2022+ Honda Grom or Monkey with the DHM Performance ECU Flash. After months of development and dyno testing, DHMotoring has produced a comprehensive remap that corrects Honda’s conservative factory mapping, eliminates the stock power dip at ~5,000 RPM, and delivers measurable mid-range gains — all while keeping engine temps in check.
Two ordering options: Ship your ECU in for flashing and return shipping, or purchase a new pre-flashed core ECU ready to install.
What the Flash Modifies
- Fuel Mapping: Full fuel table remap for safer, more powerful operation than factory. Maintains fuel economy at part throttle while ensuring safe fueling under load and keeping engine temps down.
- Ignition Timing: All spark angle maps revised to increase throttle response and power, eliminate the factory 5,000 RPM power dip, and improve part-throttle fuel economy.
- SOI (Injection Timing): Fuel delivery timing optimized for maximum efficiency and power output.
- EOT Tables: Engine operating temperature tables adjusted so the ECU properly compensates during high-temp conditions — a critical failsafe against engine damage.
- Optional: Tip sensor delete and cold start delete available.
Map Options
- Exhaust Only: Stock bike with aftermarket exhaust only
- Stage 1: Aftermarket intake + exhaust
- Stage 2: Intake + exhaust + aftermarket camshaft
- Stage 3: Intake + exhaust + camshaft + DHM piston
- DHM 149cc Big Bore: Intake + exhaust + DHM 149cc kit + DHM S1 cam + Honda PCX150 injector (PN: 16450-KZY-701)
Supported Exhausts
Yoshimura Single, Yoshimura Dual, Hindle, Vance & Hines, Anodized Racing (Amazon), Over High Mount, Toce, Zoom Loop, Brute
Supported Intakes
Chimera, MNNTHBX, TST Worx Cover, Airbox Mod, Dinger
Supported Cams & Pistons
Cams: DHM S1, CJR S2, DCR | Pistons: DHM Stock Bore
Fitment
- Make: Honda
- Models: Grom 125 (JC92), Monkey 125
- Years: 2022+
How It Works
After checkout, you will receive an email confirmation with shipping instructions and a link to an online form asking for your specific modifications. Maps are available for nearly every intake, exhaust, and cam combination — contact DHMotoring if you don’t see your setup listed.
Note: This is a service/digital product — no physical item ships unless you select the pre-flashed core ECU option.
