a photo of a man assembling a motorized bike

Motorized bikes strike an appealing balance between the classic biking experience and the enhanced mobility provided by motor-driven vehicles. Whether you're an enthusiast of eco-friendly electric bikes or prefer the raw power of gas-powered models, one thing's for sure: the heart of your motorized bike's performance lies in its engine. And where that engine sits is pivotal, not just for performance, but also for safety and the longevity of your bike. That's why we're here to dive into the art and science of motorized bike engine mounting.

Understanding your Motorized Bike

The engine is critical to the performance, safety, and longevity of a motorized bike. Mounting an engine requires understanding the specifics of the bike and the engine. Knowing the bike's frame size, material, and manufacturer guidelines is crucial for proper engine mounting. The mounting process is influenced by the type of bike and engine, requiring custom solutions in some cases.

In summary, successful engine mounting on a motorized bike involves careful planning and knowledge of the bike's design and the engine's specifications. Consider various factors, such as the bike's frame and the type of motor, to ensure that the engine is mounted safely and functions optimally.

a photo collage of motor mounts for 2-stroke engines

Tools and Materials Needed

Now that we've established the importance of knowing your specific model's quirks, it's time to roll up our sleeves and gather our gear. Mounting an engine on your bike is a task that requires precision, patience, and the right tools. Whether you're a seasoned mechanic or a weekend warrior with a passion for DIY, having the correct equipment on hand is paramount for a successful installation.

Essential Tools:

  1. Wrench Set: A good set of wrenches is invaluable for any mechanical task, and engine mounting is no exception. Ensure you have a range of sizes to match the nuts and bolts you'll encounter.
  2. Socket Set: Similar to wrenches, a comprehensive socket set will make it much easier to tighten and loosen bolts, especially in hard-to-reach areas.
  3. Screwdrivers: A set of flat-head and Phillips-head screwdrivers will likely be necessary for adjusting components and hardware.
  4. Allen Keys: Sometimes, bike components require specific tools for adjustments. Allen keys are common tools needed for working with various bolts and screws.
  5. Measuring Tape or Ruler: Precision is key when mounting your engine. You'll need to measure distances for proper alignment and balance, so a measuring tape or ruler is essential.
  6. Level: To ensure your engine sits perfectly horizontal on your bike, you'll need a level. This tool is crucial for the bike's balance and performance.

Materials and Hardware:

  1. Mounting Hardware: This includes the nuts, bolts, and brackets that will secure your engine to the bike frame. Some engines come with their mounting kits, but you may need to purchase additional hardware for a secure fit, especially if your bike frame is non-standard.
  2. Locking Compound: Vibrations from the engine can loosen hardware over time. Using a thread-locking compound can prevent this and add an extra layer of security.
  3. Rubber Spacers/Shims: These can be used between the engine and frame to reduce vibration and prevent direct metal-on-metal contact, which could damage the frame or engine over time.

Safety Equipment:

  1. Gloves: Always protect your hands with a sturdy pair of work gloves. They will not only prevent blisters but also protect you from cuts and abrasions.
  2. Safety Glasses: When you're working with tools, tiny fragments can fly. Safety glasses are essential to protect your eyes.
  3. Closed-toe Shoes: Drop a wrench on your foot once, and you'll know the importance of proper footwear in the workshop.

Pro Tip: Keep a first aid kit nearby. Accidents happen, and it's best to be prepared.

Remember, the goal here isn’t just to get the engine onto the bike; it’s to ensure it’s done right, with a secure fit and proper alignment. The correct tools and materials don't just make the installation smoother; they're an investment in the safety and longevity of your motorized bike.

Preparing for Installation

With the tools and materials ready, we're inching closer to the heart of the matter - the installation. However, jumping straight into mounting the engine without proper preparation could lead to hurdles down the road, potentially jeopardizing the integrity of both the bike and the engine. In this section, we'll walk through the crucial pre-installation steps to set the stage for a seamless engine mounting experience.

Clearing the Workspace:

  • Organize Your Area: Ensure you have ample space to work without tripping over tools or parts. A clean, organized workspace is not just about aesthetics; it's a fundamental aspect of safe and efficient work.
  • Secure Your Bike: Your bike needs to be stable during the installation. Use a bike stand if available. If not, ensure it's leaning securely in a way that allows you easy access to the engine area.

Inspecting Your Bike:

  • Frame Integrity: Thoroughly inspect your bike frame for any signs of damage or weakness, such as cracks, rust, or dents. Mounting an engine on a compromised frame poses significant safety risks.
  • Space Assessment: Verify there's enough space on the frame to accommodate the engine. Remember to consider not only the engine size but also additional components and the space they'll require.
  • Suspension and Tires: Check that your bike’s suspension and tires are suitable to handle the extra weight and vibration from the engine.

Understanding Your Engine Kit:

  • Inventory Check: Confirm that your engine kit comes with all the necessary components. Cross-reference with the product's parts list to ensure nothing is missing.
  • Manual Review: Read the installation manual thoroughly—even if you have mounted an engine before. Different kits may have unique steps or requirements.


  • Dry Fitting: Before securing anything permanently, do a dry fit. This involves placing the engine in the bike frame without fully tightening the hardware, checking for any fitment issues or obstructions.
  • Alignment Checks: Use your level and measuring tape to check that the engine sits correctly within the frame. Proper alignment is crucial for performance and safety.

Safety Precautions:

  • Wear Protective Gear: Don't overlook personal safety. Wear gloves and safety glasses to protect against sharp edges and debris.

Setting Expectations:

  • Time Allocation: Don't rush the process. Ensure you've set aside enough time to complete the installation without feeling pressured.
  • Potential Challenges: Acknowledge that you might face challenges. Whether it's a bolt that won’t fit or an unexpected step, it’s all part of the process.

Preparing for engine installation might seem tedious, but it’s a vital phase that sets the tone for the entire process.

Step-by-Step Engine Mounting Process

We've laid the groundwork, assembled our tools, and prepared the workspace. Now, it's time for the main event: mounting the engine to your bike. This stage requires all your attention and precision, as you'll be fitting the engine onto your bike and securing it in place. Follow these steps closely, and remember, patience is crucial here — it's about getting it right, not doing it fast. Let's get started!

Step 1: Positioning the Engine

  • Place the engine into the frame where it will be mounted. For most standard bikes, this will be in the area of the lower triangle, but your bike's structure and engine type might necessitate a different location.
  • Ensure there's adequate clearance for the engine, avoiding any cables, chains, or other components. The engine should sit comfortably without forcing it into place.

Step 2: Aligning the Engine

  • Once the engine is in place, check its alignment. It should be positioned as centrally as possible to maintain the bike's balance.
  • Use a level to ensure the engine is flat and not tilting to one side. Imbalances can lead to problems with performance and handling.

Step 3: Mounting Hardware Installation

  • Begin attaching the mounting hardware to the engine and bike frame. This typically involves brackets, bolts, and nuts.
  • Do not fully tighten at this stage; just secure enough to hold the engine in place. You’ll want a bit of wiggle room for final adjustments.

Step 4: Adjusting and Securing

  • With the engine in place and the mounting hardware installed, make final adjustments to its position. Check alignment again and ensure all components have necessary clearances.
  • Once everything is perfectly positioned, tighten all the hardware to secure the engine in place. Be cautious not to overtighten, as this can strip the threads or damage the frame or engine.

Step 5: Installing Additional Components

  • Depending on your engine type, there may be additional components to install, such as a carburetor or an exhaust.
  • Refer to your engine kit’s manual for specific instructions on installing these components, ensuring they're securely attached and properly connected.

Step 6: Double-Checking Your Work

  • Go over every bolt and nut, ensuring everything is tightened appropriately. Check the engine's alignment again, making sure it hasn't shifted during the final tightening.
  • Inspect all additional components, verifying they're securely installed and properly connected.

Step 7: Vibration Dampening Measures

  • If your kit includes rubber spacers or specific instructions for vibration reduction, make sure these are installed correctly. This step is crucial for a smoother ride and the longevity of your bike and engine.
  • If your kit doesn't include these, consider aftermarket options. They're a small addition that makes a significant difference.

Step 8: Clean Up

  • Clear away any tools, excess parts, or debris from your working area. Maintaining a clean space will help prevent any misplaced items or tripping hazards.
  • Take a moment to admire your work — mounting an engine is no small feat!

NOTE: Since the production of the manual and videos for Bikeberry 2-stroke engines, there has been a redesign of the Sprocket Clamp Assembly. You have the latest model, which consists of two metal plates that join to form a full circle. This assembly fits inside the hub of your wheel and will attach directly to your sprocket. Place the rubber grommets between the metal plates and your spokes, as well as between the spokes and the rear sprocket, for proper installation. You should have all the necessary components. When securing the sprocket adapter to the wheel, remember to tighten the bolts in an alternating, cross pattern to ensure even and uniform pressure throughout the assembly.

Post-Installation Checks and First Ride

The engine is mounted, and your bike has now joined the motorized league. Before you throttle up for your first ride, it’s crucial to perform post-installation checks. These checks ensure not only the safety of your ride but also optimize the performance and longevity of your motorized bike. Additionally, we’ll guide you through the initial adjustments and the maiden voyage on your upgraded machine. Let's dive in!

Safety Checks:

  • Bolt Tightness: Double-check all the bolts and nuts for the appropriate tightness. Engine vibrations can loosen bolts over time, so a thread-locking compound is recommended for added security.
  • Cables and Wires: Ensure that all cables and wires are properly routed and secured. 
  • Chain Tension: The chain should have proper tension — not too tight and not too loose. This ensures efficient power transfer and reduces wear.
  • Brakes: With the added speed and weight, effective brakes are more crucial than ever. Test both front and back brakes for responsiveness.

Initial Adjustments:

  • Carburetor Tuning: For gas engines, the carburetor will need initial tuning. This step ensures the engine receives the right fuel and air mixture.
  • Throttle Response: Test the throttle for smooth operation. It should spring back to the closed position when released.

The First Ride:

  • Safety Gear: Never overlook personal safety. A helmet, closed-toe shoes, and gloves are the bare minimum. Depending on where you're riding, additional protective gear may be advisable.
  • Start Slowly: Begin with a slow ride, paying close attention to the bike’s handling and the engine's performance. Listen for any unusual sounds and be mindful of any unexpected behaviors.
  • Test All Functions: Gradually test all of the bike's functions, including accelerating, braking, and turning. It’s better to identify any issues at low speed.
  • Short Duration: Keep your first ride short. A brief trial run allows you to assess everything without putting too much stress on the bike — or you.

Post-Ride Inspection:

  • After your initial ride, do another complete inspection. Check for any signs of wear, loose components, or potential issues that weren't apparent before the ride.
  • Pay special attention to the engine mountings, looking for any signs of shifting or vibrating loose.

Tweaks and Corrections:

  • Based on your first ride and post-ride inspection, make any necessary adjustments or corrections. This could involve tightening bolts, adjusting the chain, or fine-tuning the motor’s components.
  • Don't get discouraged by the need for adjustments. It's a normal part of the process, ensuring your motorized bike performs at its best.

Documentation and Legalities:

  • Lastly, be aware of the local laws regarding motorized bikes. Some regions require specific documentation, licensing, or have power/speed limitations.
  • Ensure you’re fully compliant with local regulations to avoid unnecessary legal troubles.

Your first ride is a milestone, but your journey with your motorized bike is just beginning. Regular maintenance, tuning, and inspections are vital for ongoing performance and safety. Treat your motorized bike with care, and it will reward you with exhilarating rides and the freedom of the open road.

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