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Piston rings

Discussion in 'Norton Commando Motorcycles (Classic)' started by jseng1, Mar 13, 2019.

  1. jseng1


    Nov 26, 2009
    Hepolite and JCC piston rings are a full 1/16" thick. The weight of those heavy rings and friction from high piston speed causes the ring lands to pound out. After about 30,000 miles the ring lands get sloppy and your bike starts smoking.

    See Jimbos post - Why are my AE piston ring land clearances so large at .006"?

    Same thing has happened to me in the past - .005 to .006" ring land clearance with hepolite pistons after 40,000 miles.

    I'm not seeing this happen with pistons using the lighter thinner .040" top rings (JE, Wiseco, Wossner, Ross etc).
    motorson likes this.
  2. Time Warp

    Time Warp .......back to the 70's. VIP MEMBER

    Dec 3, 2012
    Although a two stroke, that was noted by Suzuki regarding the RM125S I bought new in 1976.... Very thin rings that reduced ring flutter.

    Since it is a piston thread and you are one of the guru's.
    I posted this the other day with no interest it seems, I would value your opinion,not that the clips are removed often but this seems like a great idea as far as ease of instalment and no damage (minimal?) to the ring groove by their design.

  3. jseng1


    Nov 26, 2009
    That looks like an easier way to install the clips and wire clips are the best in my opinion (if the pins are chamfered on the OD they never come out). But if you want to install the OEM wire clips that came with your pistons - see the vid below at 5:17 for a technique that makes it easy.


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