Name: DHM 149cc All Inclusive Big Bore Kit for the 2022+ Honda Grom
Brand: DH Motoring
Price: 1099.0 USD
Availability: OutOfStock

Here you'll find a comprehensive kit containing nearly everything you need to big bore your 2022-2026 Honda Grom (You'll need your own aftermarket intake and exhaust and we do have options linked below). By purchasing this comprehensive kit we make it as simple as possible to install by pre-gapping the piston rings before shipping.

Includes:

DHM 149cc Forged Piston and Cylinder Kit
DHM S1 Camshaft
Kitaco x DHM 5-row Oil Cooler Kit OR Drow Sports x DHM 7-Row Cooler
High flow Honda fuel injector
AvailMS or MO Power Crankcase Vent Kit
NGK CR9E Spark Plug
DHM ECU Flash Service

Other Requirements:

Premium fuel (at least 91 octane, 93 is even better)
Quality synthetic oil of 10w40 weight or 20w50 for warmer climates

Base pricing requires you to mail your ECU in so we can program it. Once we receive it we'll flash it and send it back out with the kit so that it can all be installed together. You do have the option of purchasing a preflashed ECU as well for an additional $110.

If you already have your own aftermarket intake and exhaust setup, this kit is all you'll need. If you need an intake and exhaust, we do have a few options here:

Intake:

Exhaust:

Yoshimura

Fantastic, if not thirsty

Aside my from inability to adjust valves correctly this kit was super ez to put together, the kitaco oil cooler was the most annoying part due to a lack of clear English instructions, but with some moving about to see the angles its do-able. the power gains feel really good although I am unsure as to what the wheel hp should be now.

My only gripe is the halved fuel range but its worth it for the power

Need instructions

There really aren't any instructions on how to install this kit. Thankfully there are a couple youtubers that do a good job on installing the individual components for the most part. But you would think DHM would do a comprehensive video series on it. The oil cooler instructions were ridiculous. Worst instructinos I've ever seen in my life for anything. That being said.... once the kit is complete and running...... Wow. Its awesome.

Must have for grom

Bought this kit for my 23 grom and finally usable power for my weight. Im 220 lbs and so far this thing gets me up to 65 on stock gearing. Customer service is top notch with question or concern during installation or issues. Would recommend this kit.

Awesome kit!! Awesome business!!

Great kit for the Grom!! It sure wakes up the little beast. Pair it with a Yoshi exhaust and Chimera intake and tune. Lots more low/mid range grunt and better top end speed for sure. DHM is legit. David knows his stuff!! Solid dude.

DHM 149cc All Inclusive Big Bore Kit for the 2022+ Honda Grom

1 2 3

DHM 149cc All Inclusive Big Bore Kit for the 2022+ Honda Grom

Customer Reviews

Recently viewed