Ezm Pace Setter Gearbox for 5/8 shaft 49cc HS and Honda GXH50 Motorized Bicycle Ezmotorbikes

4 Stroke Bicycle Gearbox – EZM Pacesetter Gearbox for 5/8 Shaft Honda GXH50 & Huasheng 142F

$369.99 USD
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Ezm Pace Setter Gearbox for 5/8 shaft 49cc HS and Honda GXH50 Motorized Bicycle Ezmotorbikes
  • Ezm Pace Setter Gearbox for 5/8 shaft 49cc HS and Honda GXH50 Motorized Bicycle Ezmotorbikes
  • Ezm Pace Setter Gearbox for 5/8 shaft 49cc HS and Honda GXH50 Motorized Bicycle Ezmotorbikes
  • Ezm Pace Setter Gearbox for 5/8 shaft 49cc HS and Honda GXH50 Motorized Bicycle Ezmotorbikes
  • Ezm Pace Setter Gearbox for 5/8 shaft 49cc HS and Honda GXH50 Motorized Bicycle Ezmotorbikes
  • Ezm Pace Setter Gearbox for 5/8 shaft 49cc HS and Honda GXH50 Motorized Bicycle Ezmotorbikes
  • 4 Stroke Bicycle Gearbox – EZM Pacesetter Gearbox for 5/8 Shaft Honda GXH50 & Huasheng 142F
  • 4 Stroke Bicycle Gearbox – EZM Pacesetter Gearbox for 5/8 Shaft Honda GXH50 & Huasheng 142F
  • Ezm Pace Setter Gearbox for 5/8 shaft 49cc HS and Honda GXH50 Motorized Bicycle Ezmotorbikes
  • Ezm Pace Setter Gearbox for 5/8 shaft 49cc HS and Honda GXH50 Motorized Bicycle Ezmotorbikes
  • Ezm Pace Setter Gearbox for 5/8 shaft 49cc HS and Honda GXH50 Motorized Bicycle Ezmotorbikes
  • Ezm Pace Setter Gearbox for 5/8 shaft 49cc HS and Honda GXH50 Motorized Bicycle Ezmotorbikes
  • Ezm Pace Setter Gearbox for 5/8 shaft 49cc HS and Honda GXH50 Motorized Bicycle Ezmotorbikes
  • 4 Stroke Bicycle Gearbox – EZM Pacesetter Gearbox for 5/8 Shaft Honda GXH50 & Huasheng 142F
  • 4 Stroke Bicycle Gearbox – EZM Pacesetter Gearbox for 5/8 Shaft Honda GXH50 & Huasheng 142F
4 Stroke Bicycle Gearbox – EZM Pacesetter Gearbox for 5/8 Shaft Honda GXH50 & Huasheng 142F

4 Stroke Bicycle Gearbox – EZM Pacesetter Gearbox for 5/8 Shaft Honda GXH50 & Huasheng 142F

$369.99 USD

EZM Pacesetter Motorized Bicycle Drive — 4 Stroke Bicycle Gearbox Transmission

The Best 4 Stroke Bicycle Gearbox for 49cc Motorized Bicycle Builds

Since 2010, the EZM Pacesetter Drive has set the standard for motorized bicycle transmissions and the 4-stroke bicycle gearbox category. Designed and manufactured right here in the USA, this gearbox delivers the performance, reliability, and durability that serious riders demand — at a price that makes sense.

⚙️ Built for Performance

Forget flimsy clutches. The Pacesetter uses a larger, heavy-duty clutch sourced from the competitive go-kart racing world — the same American-made clutch trusted on the track, now powering your build. The result? Smoother engagement, longer life, and a ride that handles everything from flat roads to steep climbs.
  • 35+ MPH top speed on a standard 26" rear wheel build
  • Strong low-end torque for tackling hills with ease
  • Lightweight yet durable construction — power without the bulk

🇺🇸 Made & Supported in the USA

Every major component — including replacement parts and belts — is sourced domestically. That means faster shipping, easy repairs, and no hunting down overseas parts when you need to get back on the road.

🔧 Compatible Engines

The Pacesetter Drive is purpose-built for:

  • Honda GXH50 (5/8" straight shaft)
  • Huasheng 142F — Chinese clone with 5/8" straight shaft
Bonus: When paired with a Honda GXH50 engine, this combo can achieve over 150 MPG — making it one of the most fuel-efficient motorized bike setups available anywhere.

📐 Fitment & Chain Specs

Spec Requirement
Rear Wheel Size
26"
Rear Drive Sprocket
56–62 tooth
Chain Pitch
#41 chain only (#415 chain will NOT work)

✅ Why Choose the EZM Pacesetter?

  • ✔️ Established brand since 2010
  • ✔️ USA designed, made, and supported
  • ✔️ Racing-grade go-kart clutch (also USA-made)
  • ✔️ Simple belt & part replacement — no specialty tools needed
  • ✔️ Parts readily available domestically
  • ✔️ 150+ MPG potential with compatible Honda engine
Build smarter. Ride farther. The EZM Pacesetter Drive — the go-to 4-stroke bicycle gearbox for serious motorized bicycle enthusiasts since 2010.
Note: This drive is compatible with 5/8" straight shaft engines only. Verify shaft size before ordering. #41 chain required — #415 chain is not compatible with this system.

❓ FAQ

What is a bicycle gearbox? A bicycle gearbox is a transmission system that transfers power from the engine to the bike’s rear wheel, helping deliver usable speed and torque for motorized bicycle builds.
How much does a bike gearbox cost? Pricing can vary by brand and features. The EZM Pacesetter is positioned as a durable, USA-supported 4-stroke bicycle gearbox built for long-term value.
What is the best 4-stroke bicycle engine kit? The best setup depends on your bike and riding needs, but the EZM Pacesetter is a strong choice for riders looking for a reliable 4-stroke gearbox transmission with Honda GXH50 compatibility.
What is the maximum speed of a 49cc 4-stroke bike engine kit? Speed depends on engine size, gearing, wheel size, and rider weight. This Pacesetter system is rated for 35+ MPH on a standard 26" rear wheel build with compatible setup.
What engines are compatible with this 4 stroke bicycle gearbox? This gearbox is designed for 5/8" straight shaft engines, including the Honda GXH50 and Huasheng 142F.
What chain does the EZM Pacesetter require? The Pacesetter requires a #41 chain only. #415 chain is not compatible with this system.
Note: This drive is compatible with 5/8" straight shaft engines only. Verify shaft size before ordering. #41 chain required — #415 chain is not compatible with this system.