All orders over $150 ship for free to the United States!

Honda Grom Stage 3 | DHM Piston, ECU Reflash, and Camshaft

$275.00
by DH Motoring
ECU Core
Camshaft

The DH Motoring Stage 3 Package includes the following:

  • DHM ECU Flash
  • DHM High Compression Stock Bore Piston
  • TB Camshaft or Decha HR Camshaft
  • NGK CR9E Spark plug with spacer

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 13.5hp 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 ($115 extra), 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

 Install: 

Customer Reviews

Based on 72 reviews
90%
(65)
7%
(5)
1%
(1)
0%
(0)
1%
(1)
e
e.h.
The grom rips now!

As soon as i got the kit threw it on in an hour and it rips have put 1200 miles on it wide open 90% of the time and not a single issue. Im 160lbs and it will do 65-70mph no problem and plenty of power for wheelies.

N
NICK EDWARDS
Stage 3

Totally recommend this kit, the power increase at the top end of the rev range is fantastic, really pleased with the results

P
Paul Stover
Honda Grom Stage 3 | DHM Piston, ECU Reflash, and Camshaft

Everything worked as it should. Great power as well as top end speed!! Tach didn't work so emailed DH and moved a pin in the harness and worked perfectly.

J
J.J.
Get this and smile

All I can say that with my config of the Decha CAM, Piston, ECU Tune and Koso filter my mid end power is ridiculous. combined with my 14t sprocket i zip off the line and getting to. Great products and rings were pretty much already gaped for install. Wish I would have gotten the ported head now. Get this setup!

A
Andrew
Would not recommend this kit

Got this kit hoping to gain power, lost most power. Followed the instructions and it seems to have less power than stock. Can only get to 55mph before the bike bogs out. Having to rev the crap out of the bike to get anything. No solution for my problem. Would not recommend at all. Save money and buy a tuner.

123