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DHM Ported Cylinder Head for the 2022+ Honda Grom / Monkey

$379.00
by DH Motoring

This ported cylinder head provides HP and Torque gains across the entire RPM range by optimizing the port shape and flow. It includes stiffer valve springs and has clearance for any aftermarket cam on the market. Expect noticeable power gains when adding this head to any setup. 

  • 25mm intake port for use with the stock throttle body
  • Flush valve guides for optimized port flow
  • Ideal intake port flow to maximize velocity
  • Compatible with any piston and/or big bore kit on the market
  • Compatible with any Grom cam on the market
  • Requires additional ECU tuning or Standalone ECU adjustments
  • Includes upgraded valve springs and retainers

Pairs well with either our S1 or S2 Camshafts!

Customer Reviews

Based on 8 reviews
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Elmer W
Wowww!

I have incrementally been doing upgrades to my 2023 Honda Grom, with this ported and polished head and the koso 34mm TB being most recent. DHM 149cc, DHM S1 Cam, DHM P/P head, Koso 34mm TB and DHM tune. Wowwww...this head and TB really woke this bike up. Revs so quickly and I'm more than pleased. David answered my questions quickly and customer service is A1. A+++

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L.S.

I already had s1 cam and high compression piston on my 2024 monkey . After installing this ported head
The bike had incredible more power this really did the trick. Thanks DHM

T
TJ Kroehle
Clean Design

Received my new ported head, that will soon be placed on my full 149 cc build. We have gone all out. The quality of workmanship is beyond reproach. I’ll let you know how the full building ends up.

G
Gabriel Naranjo
2025 dax running great

Kitaco intake yoshimura gp magnum exhaust DHM s1 cam, this ported head and my oem ecu reflashed. It’s such a difference to stock. Now all it wants to do is rev high. I’d recommend it to anyone wanting more out of their bike.

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Jorge Gómez Sera
Cylinder head

You can see a lot of difference with the original, it's just what I was looking for and the shipment to Spain has been super fast

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