Collection: 2025 Honda Grom 149CC Big Bore Build - Custom Parts & Upgrades

Premium 2025 Honda Grom Build - 160 Miles to Track-Ready
This showcase build represents our first 2025 Honda Grom project, featuring top-tier performance upgrades installed at just 160 miles. Zac collaborated with our team before purchase to design the ultimate Grom build with best-in-class components.
Featured Performance Upgrades:
- DHmotoring big bore and ported cylinder head
- Complete Aracer standalone ECU system
- Racingbros suspension components
- Ohlins rear shock absorber
- Premium OEM-style body components
- Professional engine tuning and setup
From our shop directly to the legendary Tail of the Dragon - this build proves what's possible with quality parts and expert installation. Browse the components that made this transformation possible.

Howling Moto
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Motion Pro Quick Throw Throttle Tube | Honda Grom 125, Monkey 125 & Trail 125 (All Years)
Regular price $12.49 USDRegular priceSale price $12.49 USD -
Superlite 420 Front Sprocket | Grom Monkey Z125 CRF110 | 13T-17T
Regular price $17.95 USDRegular priceSale price $17.95 USD -
ProTaper SE KLX110 Handlebars – Silver | Honda Grom, Monkey, KLX110, Z125
Regular price $86.99 USDRegular priceSale price $86.99 USD -
Avail Motorsports Cam Cover Vent | Honda Grom & Monkey | All Years | Big Bore Compatible
Regular price $79.95 USDRegular priceSale price $79.95 USD -
TST LED FRONT FLUSH MOUNT TURN SIGNALS FOR HONDA GROM
Regular price $19.99 USDRegular priceSale price $19.99 USDSold out -
Avail Motorsports HD Cush Drive – Honda Grom, Monkey & Super Cub (All Years)
Regular price $69.95 USDRegular price$69.95 USDSale price $69.95 USDSold out -
Kitaco 60% Stiffer Clutch Spring for all years Grom, Monkey, Super Cub, Trail 125, Dax 125
Regular price $28.00 USDRegular priceSale price $28.00 USDSold out -
NGK CR9E Spark Plug for Honda Grom & Monkey - High Performance
Regular price $13.95 USDRegular price$13.95 USDSale price $13.95 USD -
RK 420 MRU Chain | Japan-Made Motorcycle Drive Chain
Regular price From $160.04 USDRegular priceSale price From $160.04 USD -
The Speed Shop Cam Chain Roller Bearing Tensioner | Honda Grom, Monkey, Cub & Trail 2022-2024
Regular price $140.00 USDRegular priceSale price $140.00 USDSold out -
Womet-Tech Universal Mini-Bike Axle Slider Kit
Regular price From $44.99 USDRegular price$176.91 USDSale price From $44.99 USDSold out -
K&N RC-1060 Universal Round Tapered Clamp-On Air Filter | 49mm | Grom, Monkey, CRF110 & More
Regular price $52.99 USDRegular price$52.99 USDSale price $52.99 USD -
TST Industries Honda 3-2 Turn Signal Plug Converters
Regular price $13.99 USDRegular priceSale price $13.99 USDSold out -
OTB V3 Notched Cam Cover for Honda Grom & Monkey – Billet Aluminum
Regular price From $68.95 USDRegular priceSale price From $68.95 USD -
Kitaco Super Oil Pump – 2022+ Honda Grom & Monkey 125 (JC92)
Regular price $89.95 USDRegular price$58.95 USDSale price $89.95 USD -
DHM S1 Camshaft for 2022+ Honda Grom & Monkey 125 - Generation 2 Performance Upgrade
Regular price $179.00 USDRegular price$179.00 USDSale price $179.00 USDSold out








