Motorized bicycles pair pedal power with compact gasoline engines, delivering versatile performance for DIY riders. The right engine mount ensures a secure, vibrations-free connection between frame and engine, supporting reliable starts and consistent power transfer. This guide spotlights top motor mounts designed to fit 49cc through 80cc two-stroke engines, plus select four-stroke plates for heavier builds. Each option emphasizes sturdy construction, universal fitment, and straightforward installation. Below is a quick summary table followed by detailed product sections and a practical buying guide to help you compare fits, materials, and mounting styles.
| Product | Brand | Engine Range | Mount Type |
|---|---|---|---|
| CDHPOWER Universal Mounting Bracket 66cc/80cc | CDHPOWER | 66cc/80cc | Universal Mounting Bracket |
| DONSP1986 Improved Black Universal Motor Mount 1.5 Inch | DONSP1986 | 48cc/66cc/80cc/yd100 | Universal Downtube Mount |
| DONSP1986 Improved Silver Universal Motor Mount 1.5 Inch | DONSP1986 | 48cc/66cc/80cc/yd100 | Universal Downtube Mount |
| CDHPOWER Black V-Frame Mounting Plate Kit 4-Stroke | CDHPOWER | 49cc | V-Frame Mounting Plate |
| Generic 100cc 49cc 66cc 80cc OCC Chopper Mount | Generic | 49cc/66cc/80cc/100cc | Fixed Bracket |
In the following sections, each product is presented with a concise overview, key specifications drawn from the listed features, and installation notes to help you compare fit and durability across options. All product sections use a consistent format: a clickable title linking to the Amazon listing, an image block, a short descriptive paragraph, and a bulleted features recap.
CDHPOWER Universal Mounting Bracket 66cc/80cc
This universal mounting bracket from CDHPOWER is designed to attach 66cc/80cc gas engines to a bicycle frame. It supports front-mount bolt connections and fits a range of frame downtubes. The design emphasizes compatibility with common 1.5″ to 2″ stud spacing, making it a practical choice for many 66cc and 80cc builds. The bracket is intended to secure the engine to larger down tubes, reducing flex and improving stability during operation. It is well-suited for riders seeking a straightforward, widely compatible mounting solution.
- Inner diameter: 1.5″ (38.1 mm)
- Compatible with 1.5″ to 2″ stud spacing; front mount bolts 6 mm and 8 mm
- Engine range: 66cc/80cc and 48cc 2-stroke bikes
- Universal mount for bike motors; designed to fit larger downtubes
Overall, this CDHPOWER bracket offers a balance of broad compatibility and robust construction, making it a strong option for many two-stroke engine conversions that require solid support on larger frames.
DONSP1986 Universal Bracket For Bigger Down Tubes 1.5″
The DONSP1986 universal mounting bracket is designed for bigger down tubes, offering a sturdy base for various two-stroke engines. It accommodates downtube diameters around 1.5″ to 2″ and includes hardware designed for front-mount bolts. The product description notes a specific inner bolt diameter of about 2.047 inches (52 mm) and a plate thickness around 2.9 mm, with the included 8 mm bolts intended to fasten the engine to the plate. This setup is particularly suitable for riders who want a robust interface that can handle different engine brands and mounting configurations.
- Inner diameter: 2.047″ (52 mm)
- Supports 1.5″ to 2″ stud spacing; front mount bolts 6 mm and 8 mm
- Includes 8 mm bolts for engine attachment; check engine front mount bolts (6 mm)
- Fits 48cc/66cc/80cc/yd100 two-stroke kits
The bracket’s emphasis on larger downtubes makes it a practical choice for builders working with robust frames or trying to maintain clearance on wider engines.
DONSP1986 Improved Black Universal Motor Mount 1.5 Inch
This improved black universal motor mount from DONSP1986 is designed to work with a broad range of 2-stroke gas motor kits. The inner diameter is 1.5″ (38.1 mm), which aligns with many downtube sizes, and the pedestal design emphasizes compatibility across brands and motor widths. The mount is built to accommodate various 48cc, 66cc, 80cc, and yd100 engines, reducing the need for frame-specific adapters. The improved pedestal adds stability, making it suitable for more demanding applications while remaining straightforward to install.
- Inner diameter: 1.5″ (38.1 mm)
- Compatible with 38.1 mm downtubes; supports all 2-stroke kits listed
- Pedestal is improved for broader motor compatibility
- Suitable for 48cc/66cc/80cc/yd100 engines
With its focus on universal fit and a tougher pedestal, this mount is a dependable choice for riders seeking a durable interface between frame and a mid-size gas engine.
Improved Silver Universal Motor Mount 1.5 Inch
The Improved Silver Universal Motor Mount is designed for 1.5″ downtubes on a wide range of 2-stroke bikes. This mount emphasizes compatibility with 48cc, 66cc, 80cc, and yd100 engines, and its pedestal design provides consistent support across different brands. The silver finish signals a robust build, and the mount’s simple interface is suitable for riders who want a reliable upgrade to their motorized bicycle without complex modifications.
- Inner diameter: 1.5″ (38.1 mm)
- Compatible with 38.1 mm downtube frames; supports 2-stroke kits
- Broad engine compatibility: 48cc/66cc/80cc/yd100
- Pedestal is designed for universal use across brands
For builders aiming for a clean, consistent look with dependable performance, this mount offers a balanced mix of ease of installation and broad compatibility.
CDHPOWER Black V-Frame Mounting Plate Kit 4-Stroke
This CDHPOWER V-frame mounting plate kit provides a sturdy base for 4-stroke gas engines, specifically noted for 49cc builds. The mounting plate features a bolt hole pattern, including a 6.5 mm by 26.5 mm configuration, to secure the engine to the frame. The design supports typical V-frame setups and offers reliable stability for four-stroke conversions. The kit is a practical option for riders prioritizing a robust, fixed mounting surface when upgrading to a 4-stroke powertrain.
- Bolt hole pattern: 6.5 mm x 26.5 mm
- Designed for 4-stroke engines, especially around 49cc
- V-frame mounting compatibility for common bike frames
- Heavy-duty construction intended for regular use
For riders pursuing a traditional, fixed mounting approach with a four-stroke engine, this plate kit provides a proven interface that fits standard V-frame configurations.
Generic 100cc 49cc 66cc 80cc OCC Chopper Mount
The Generic OCC chopper mount is a stainless steel, fixed bracket designed for 2-stroke engines ranging from 49cc up to 100cc. The stainless steel construction emphasizes durability and resistance to wear, making it suitable for longer-term use on everyday riders’ builds. This fixed bracket provides a straightforward mounting solution with reliable alignment, supporting secure attachment of a variety of small-displacement motors to custom frame configurations.
- Material: Stainless steel
- Engine range: 49cc/66cc/80cc/100cc
- Mount type: Fixed bracket for stable engine alignment
- Durable construction intended for long-term use
As a versatile, fixed mounting option, this bracket supports a broad set of mini to mid-size engines, offering dependable performance in a compact form factor.
Buying Guide
Key purchase considerations
Choosing the right motor mount involves matching the frame, engine, and intended use. First, verify downtube compatibility—most mounts target 1.5″ to 2″ downtubes and use front-mount bolts sized 6 mm or 8 mm. Consider whether you need a universal mount for multiple engines or a dedicated plate for a specific engine family, such as 4-stroke 49cc or 2-stroke 66cc/80cc. Material and finishes influence durability, with stainless steel and powder-coated finishes offering longer lifespans in various climates. Finally, assess installation simplicity, hardware included, and whether the setup preserves frame clearance and rider safety.
Compatibility and fitment
Frame compatibility is the cornerstone. If your downtube measures around 1.5″ (38.1 mm), a universal 1.5″ mount is typically appropriate. For wider or differently spaced engines, some mounts accommodate up to 2″ studs, but verify bolt sizes and spacing in your engine’s front bracket. For four-stroke conversions, a dedicated mounting plate or V-frame assembly may provide the most rigid support, reducing flex and ensuring precise alignment during operation.
Engine type and power handling
Two-stroke engines (49cc, 66cc, 80cc) are common in many universal mounts, offering light weight and simple installation. Four-stroke setups (around 49cc) may require a sturdier V-frame plate or specific 4-stroke brackets to handle added torque. Check the mounting plate’s bolt-hole pattern and pedestal design to ensure it aligns with your engine’s mounting points and frame geometry. A robust mount minimizes vibration and helps maintain consistent power delivery during acceleration and cruising.
Durability, materials, and finish
Durability hinges on construction quality. Stainless steel brackets resist corrosion and maintain strength over time, while powder-coated finishes help guard against rust and cosmetic wear. For off-road or damp environments, prioritize mounts with reinforced pedestals or thicker mounting plates. Examine whether hardware such as bolts is included, and if the kit provides spacers or washers needed for a secure, flush fit on your bike frame.
Installation considerations and safety
Plan for precise alignment and torque when tightening front-mount bolts. Improper installation can cause engine misalignment, increased vibration, or suboptimal chain and belt alignment. Follow manufacturer guidance for bolt torque and sequence, and verify after the first ride that all fasteners remain secure. Consider consulting a bike shop or experienced builder if you are new to motorized bike installations, especially when integrating a four-stroke engine or a redesigned frame mounting surface.
Comparison at a glance
| Product | Engine Range | Mount Type | Notes |
|---|---|---|---|
| CDHPOWER Universal Mounting Bracket 66cc/80cc | 66cc/80cc | Universal Mounting Bracket | Broad compatibility with 1.5″–2″ stud spacing |
| DONSP1986 Universal Bracket For Bigger Down Tubes | 48cc/66cc/80cc/yd100 | Universal Downtube Mount | Good for wider downtubes and multiple engines |
| Improved Silver Universal Motor Mount 1.5″ | 48cc/66cc/80cc/yd100 | Universal Mount | Balanced, easy install, broad engine support |
| CDHPOWER Black V-Frame Mounting Plate Kit 4-Stroke | 49cc | V-Frame Mounting Plate | Solid for four-stroke conversions |
| Generic 100cc OCC Chopper Mount | 49cc/66cc/80cc/100cc | Fixed Bracket | Stainless steel, fixed, versatile across engines |
When selecting a motor mount, prioritize a balance between fit flexibility and structural rigidity. If you plan to upgrade to a larger engine or use a frame with unusual downtube dimensions, a universal mount with a broader bolt pattern can save time and reduce fabrication. For four-stroke builds, a purpose-built V-frame plate may provide the most predictable alignment and longevity. Finally, assess the availability of included hardware and the ease of future maintenance or reconfiguration as your motorized bike evolves.