LAB-331-Harley-Davidson 135 Crate Engine | King of the Baggers Modifications

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In this episode, I'm joined by Lurch and we talk about the all-new Harley-Davidson 135 crate engine.  We also talk about the modifications Harley has made to their King of the Baggers (KOTB) bikes to make them handle and go as fast as they do.

The 135 was built directly with information gathered from the Harley-Davidson KOTB race team. Built on the Harley-Davidson 131 Milwaukee 8 platform, the larger 135 was achieved through the stroke.  It is four cubic inches larger or roughly three percent. Although there was a three percent increase in displacement there was actually a ten percent increase in horsepower and torque.

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So here is what changed from the 131 to the 135:

• A 68-mm throttle body (as compared to a 64-mm)
  • • • • Mated to a C&C ported 68-mm aluminum intake manifold
          Developed and ran on 2022 H-D KTOB bikes
      • New pin height on the piston to account for the stroke
        • Piston size as far as height is less making more space in the cylinder
      • Screamin' Eagle oil pump and cam plate standard
      • Fuel injectors were increased to 5.5 grams per second with new injector targeting
      • The 135 comes fully assembled and inspected by the factory.  They say it's a petty easy change out.  It's a drop-in for the 2021 and later M8 touring bikes. The price of the new 135 engine will be around $8,000 dollars and comes with the Screamin' Eagle warranty.
        • Fits ’21-later Touring models equipped with air/Oil-Cooled Milwaukee-Eight® engine. Does not fit Trike models. Requires separate purchase of Head Pipe P/N 65600177 and Oil Cooler Fan Assist P/N 62700204 or Fan for Factory Oil Cooler P/N 26800195. All models require ECM recalibration with Screamin' Eagle Pro Street Tuner for proper installation. Does not fit California models.

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The KOTB bikes are required to start with a stock frame.   Here is a list of modifications done to the KOTB bikes:

• The 131 c.i. (2146 cc) engine (approx. 150 horsepower and 150 foot-pounds of torque)
  • Compression is pumped up with high-performance pistons
  • Racing cam
  • Larger fuel injectors
  • Larger Throttle Body and Intake
  • Racing exhaust
• Upgraded cooling
  • Larger oil cooler in the fairing
  • Extended cooling fins on engine
  • Horn fangs (scoops air onto the rear cylinder)
• More ground clearance for improved lean angle
  • 55 degrees as compared to the stock 32 degrees
• Ohlins Screamin' Eagle suspension
  • Inverted front
  • Rear shocks have external reservoirs
• Mid foot controls
  • Up and back for more of a forward racing position
• Aluminum primary cover designed for maximum lean angle
• Transition is GP shift bike
  • Opposite of stock
• Reduced weight
  • Removed non-essential parts
  • Usage of carbon fiber and aluminum parts
  • The bikes are around 635 lbs as compared to a stock bike at 850lbs
• 17-inch cast aluminum wheels to run the Motoamerica-approved Super Bike racing slicks
• Chain Drive
• Aluminum swing arm
  • removes the need for idle gear
    • for chain conversion – had to get around the stock swing arm
• Brembo 4-piston brake caliper and 300 mm rotors
• Race seat designed for individual riders
  • Tank formed for racers' legs/knees
• Racing grips, levers, and controls

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