Busting The Engine Break In Myth | MC Garage

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  • Published on:  Monday, November 12, 2018
  • How to break-in a new engine is an extremely contentious topic. In this video from the MC Garage we bust the engine break-in myth by building up two engines, breaking them in using drastically different methods, and then tearing them down and comparing the components at the heart of the discussion.

    Read the full story on Motorcyclist: https://www.motorcyclistonline.com/busting-engine-break-in-myth/

    Engine Break-In Specs

    Engine 1, “By The Book Break-In”
    Installed at 1,828 miles, removed at 2,861 miles
    Break-In Notes: Ridden gently. Didn’t exceed 50% throttle or 5,000 rpm for the first 600 miles, and didn’t exceed 75% throttle or 7,000 rpm until 1,000 miles. Didn’t experience WOT until 1,000 miles was accumulated. Ridden with constantly varying engine speed and load, no easy task on a slow bike in a busy, urban environment! Oil and filter changed at 600 miles.
    Piston OD: 2.9910” at install, 2.9910” after 1,000 miles
    Cylinder ID: 2.9925” at install, 2.9930” after 1,000 miles
    Top Ring End Gap: 0.0130” at install, 0.0145” after 1,000 miles
    Compression: 235 psi hot after 1,000 miles
    Leak Down: 4% hot after 1,000 miles

    Engine 2, “Brutal Break-In”
    Installed at 2,861 miles, removed at 3,890 miles
    Break-In Notes: Went to WOT within moments of first starting up, and was ridden hard for 1,000 miles. Did everything we’re told not to—lots of throttle and high-speed droning at steady throttle. Oil and filter changed at 600 miles.
    Piston OD: 2.9910” at install, 2.9910” after 1,000 miles
    Cylinder ID: 2.9925” at install, 2.9930” after 1,000 miles
    Top Ring End Gap: 0.0130” at install, 0.0150” after 1,000 miles
    Compression: 235 psi hot after 1,000 miles
    Leak Down: 4% hot after 1,000 miles

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  • Source: https://youtu.be/xpoglovyy_8
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