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  1. #1
    ...here I go again...
    Join Date
    Nov 2007
    Location
    Montreal Quebec Canada
    Posts
    112

    Piston pins on 5KE...



    a d v e r t i s e m e n t

    I heard a couple of horror stories about piston pins cracking on 5KE.
    How often do you change them?
    If everything seems under control, you are just not going fast enough!
    Mario Andretti

  2. #2
    ...laterally accelerating to a track near you...
    Join Date
    May 2002
    Location
    Isle of Man, UK
    Posts
    1,026
    At the same time as the piston. Never had a problem with one in 9 years or running the bike.

  3. #3
    ...my fingers hurt...
    Join Date
    Aug 2001
    Location
    Washington State, USA
    Posts
    905
    Eddy,

    There was a real problem with the pin and bearing when the 5KE first came out in 2000. Several people had pins break at 150 miles up on the banking at Daytona.
    Yamaha modified the pin and bearing (micro polished the pin and chamfered the ends of the needle bearings) and that helped resolve the major problem. I will have pins discolor and jam in the pistons (much more so than the older 4TW) by I pretty much just change pins and bearings with Pistons now.
    Bruce Lind
    1975 TZ750 upgraded with R6 Suspension & wheels for Phillip Island Classic
    2018, 2019, 2020
    1998 TZ250 YEC kit, Ohlins forks, Brembo front brakes
    2020 - my 57th season "ON THE PAVEMENT"!

  4. #4
    ...battling for points... vince24x's Avatar
    Join Date
    Dec 2002
    Location
    orange county, ca
    Posts
    1,986



    a d v e r t i s e m e n t

    per manual: 500km never had an issue, following what the other guys said.

    vince
    CVMA, WERA, WSMC Ex #224
    http://www.mobiusracing.com

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