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!
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 kit was definitely worth the investment, financially and in the time spent installing. I'll start by saying that I have never been into a motor this far. I would say I'm a decent maintenance mech, but not much more than that. After watching the video I figured I would give it a try. I'm glad I went for it. The installation was pretty easy as long as you take your time. I watched the video a few times before attempting and watched while moving through the process. I also have the factory service manual for reference.
My Grom is a 2018(will apply to any after '16) and one difference not in the video is that the 02 sensor will require a special socket(snap on FRXM17,a little pricey at $63) or modified tool to remove. I just cut a slot into a deep well socket and it worked to take it off and torque it back on.
I would definitely buy this kit again and would recommend one to anyone.
DHM Honda Grom Stage 3 Package (UPGRADE for prior DHM Customers)
Great product, very well made! This was the perfect addition to an intake, exhaust, and cam. The installation is pretty straight forward, especially after watching Unknown Overlands video.
I notice stronger pulls off the line, along with more power throughout the climbing revs.
Only thing I needed from the auto parts store was a qt of oil and a NGK CR9E spark plug.
Don't forget to reset all of your sensors after this install!
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 ECU Flash
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.