Home Forums 2-Cycle Racing Yamaha kt 100 engine life vs power

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    • #52703
      Tom Petalino

      My race engine has about 16 hrs of run time. Checking compression ,it   has good numbers  . 165psi. Used a snap on gauge.  My question is . Withh good compression , does performance drop with that many hours on it?

    • #52747
      Greg Wright

      Yes it does, compression may be good, in fact with the modern “Gold” ring compression rarely suffers.

      But piston wear will create extra slap which is bad for top end performance not to mention the chance of skirt breakage. Main bearings also lose power after X number of hours.

      Greg Wright
      Rapid Racing Inc.
      Vintage B-Stock Pilot
      "When in doubt Gas it, It won't help but it ends the suspense."

    • #52790
      Walt Gifford

      Rebuild it before it grenades and you’ll save money.


      FAA certified jet engine and aircraft technician,
      Nicholson Speedway class champion 2001,
      Yamaha KT100 Service Center,
      41 years karting experience

    • #52818
      Jim White

      I’d have competent builder look that guy over. 16 hours is a lot on a yammie. It may not need a total rebuild but as said above if it goes boom its going to cost way more to fix. Preventative maintenance is the key to both power and longevity.

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