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 13hp 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 or you can send yours in to be flashed.
An oil cooler and extra crankcase vents are required for this kit to operate reliably.
I ordered the kit, but I can’t install it until the head is available
I can’t install it till the end of the month when the ported head is available. I would love to say it’s the best thing I’ve done for my bike, but I don’t know yet. Shipping was fast and I’m waiting patiently. 🤩
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Dominic Protextor
Easy install, everything needed besides oil cooler and crank case breather came with it so it was nice they included gaskets as well!
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Nancy Dion Mc Greal
DHM Stage 3 Kit for the 2022+ Honda Grom / Monkey
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Abdul Abu
Lil Dragon breather
She can breath a lot better now. EZ 60mph with no issues. The only issue I've encounter is the bike gets a little choppie in 3 & 4 gear about 7k RPM. I've reset the ECU,Tps and still the same issue.
