VITO’S Yamaha Banshee crank crankshaft 4mm long rod stroker 115mm welded KOYO

VITO’S 4mm Long Rod Stroker Crankshaft – 115mm Welded with KOYO Bearings. This performance-driven crankshaft is engineered for riders who demand more horsepower, torque, and high-RPM stability from their machine.

Designed with a +4mm stroke and 115mm long rod, this crank increases displacement and compression, providing noticeable gains in low-end torque and mid-range power. It comes fully trued and welded for superior strength, making it ideal for high-performance or racing applications.

Equipped with premium KOYO main bearings, the crankshaft offers smooth rotation, extended longevity, and resistance to extreme wear, even under the toughest riding conditions. Whether you’re building a dune monster or a drag strip beast, this crankshaft is built to perform.VITO’S Yamaha Banshee crank crankshaft 4mm long rod stroker 115mm welded KOYO

🔧 Uses:

The VITO’S 4mm Long Rod Stroker Crankshaft is specifically designed for performance upgrades in Yamaha Banshee 350 engines. Common uses include:

• Engine Stroker Builds: Increases stroke by +4mm to enhance engine displacement and torque.

• High-Performance Racing: Popular in drag, dune, and trail racing setups for improved low-end power and mid-range pull.

• Big Bore Kits Compatibility: Works seamlessly with 421cc, 472cc, and other big bore top-end kits.

• Engine Rebuilds/Upgrades: Ideal for replacing stock or worn crankshafts with a reliable and power-enhancing alternative.

⚙️ Properties:

1. +4mm Stroke:

   • Adds extra displacement for more power and torque.

   • Improves throttle response and low-RPM torque delivery.

2. 115mm Long Rod:

   • Reduces side load on pistons for increased longevity.

   • Enhances piston dwell time at TDC for improved combustion efficiency.

3. Trued & Welded:

   • The crankshaft is trued (precision balanced) to eliminate vibration.

   • Welded to prevent shifting or twisting under high loads—crucial for high-RPM or race applications.

4. KOYO Bearings:

   • High-performance Japanese bearings known for durability and smooth rotation.

   • Excellent resistance to heat and mechanical stress.

5. Heat-Treated Components:

   • Ensures toughness and longevity, especially under extreme performance conditions.

6. Drop-In Fit:

   • Direct replacement for all years of the Yamaha Banshee 350.

   • Compatible with stroker pistons and aftermarket cylinders.

🏭 Manufacturing Process:

1. Forging the Crankshaft:

   • The crank is forged from high-grade steel for maximum strength and fatigue resistance.

2. Machining & CNC Finishing:

   • Precision-machined using CNC technology to exact specifications for journal diameters, stroke length, and rod alignment.

3. Rod Assembly:

   • Fitted with a 115mm connecting rod, often made from treated alloy steel for strength and reduced reciprocating weight.

4. Welding:

   • Once assembled and aligned, the crank is welded at key points to lock the halves together, preventing slippage during high-performance use.

5. Truing & Balancing:

   • After welding, the crank is trued to eliminate run-out and dynamically balanced to ensure smooth operation at high RPMs.

6. Bearing Installation:

   • Premium KOYO main bearings are press-fitted and aligned to ensure optimal rotation and load handling.

7. Quality Control:

   • Each crank undergoes rigorous inspection, including dimensional checks, straightness, and rotational smoothness before final packaging.

🛠️ How to Use:

Using the VITO’S 4mm Long Rod Stroker Crankshaft involves installing it as part of a bottom-end engine rebuild or performance upgrade for your Yamaha Banshee 350. Here’s a step-by-step outline:

🔧 1. Prepare the Engine Cases:

• Split the Banshee’s engine cases using the proper tools.

• Clean all internal surfaces thoroughly and inspect for damage or wear.

🧩 2. Install Main Bearings:

• Press in the KOYO main bearings that come with the crankshaft into the engine cases.

• Ensure proper alignment and lubrication.

⚙️ 3. Insert the Crankshaft:

• Carefully place the VITO’S +4mm crankshaft into the bearing seats.

• Align the crankshaft journals and ensure it spins freely.

📐 4. Set Up for a Stroker Build:

• Because this crankshaft adds +4mm stroke and uses a 115mm rod, you’ll need:

  • Stroker pistons or domes

  • Cylinder spacers or modified cylinders (depending on your top-end setup)

• Ensure piston-to-head and port timing clearance is correct.

🔩 5. Reassemble the Engine:

• Close the engine cases with appropriate gaskets and torque all bolts to spec.

• Reinstall the transmission, clutch, and top end according to your build plan.

⛽ 6. Break-In and Tune:

• After reassembly, properly break in the engine.

• Rejet your carburetors and fine-tune ignition timing if needed to accommodate the increased displacement and power.