DHM Honda Grom Stage 3 Package (UPGRADE for prior DHM Customers)

DH Motoring

Regular price $162.00

Shipping calculated at checkout.

Customer Reviews

Based on 11 reviews
Grant Stephens
DHM High comp piston

10/10 recommend doing. This is how Groms should come from the factory!!!

Juan c Santiago
Awesome kit!!!

Looove the stage 3 kit. More rpm and definitely more mid range power!!!

ryan gabor
great product great people

do not be hesitant about this, it is by far worth the money and david is great to work with. the power difference is awesome, install is a breeze. hit the order now button asap

Alex Hunt

Fun project to do on a grom! Perfect for someone who wants some engine experience and more power! Completely brought back the low end I was missing from the cam. More than worth the price!

The best you can get for your money

Honda should have this installed from factory. This kit makes the bike so much more fun to ride. At just about any gears you can turn the throttle and go, acceleration is amazing compares to stock. When idling, you could literally hear the punch from the tail pipe, it sounds deep and strong.
I had it in my Grom for a week now and loving it.
Thank you Dave for your innovation.

This is the Upgrade kit for existing DHM customers! You MUST send in your previously flashed DHM ecu. If you send in a virgin ECU you will be charged at the full kit price, not the upgrade price. If you do not already own a DHM Stage 1 flash or cam package, do not order from this page. You can order a complete kit HERE.

The DH Motoring Stage 3 Package consists of the following:

DHM High Compression Stock Bore Piston
TB Parts Camshaft
NGK CR9E 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! 

We are not selling preflashed cores as part of upgrade packages. You must send yours in to be updated. This is subject to change, but at the moment there will be no exceptions to this. 

Install video: