Piston Ring Gap Location, Honda 05 vs HRS?

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    • May 3, 2017 at 6:06 am #81185
      Steve Frank
      Participant

      Geez, what happened to ekarting forums?  8 years ago, there would have been 10 different responses, and 30 ensuing arguments….Seriously, NOBODY else has run into this same issue?

    • May 3, 2017 at 6:33 am #81186
      Matt Martin
      Participant

       

       

       

      is it in the same location as these two photos?

       

       

      Swedetech quotes blueprinted/mod 1999 CR125 top end replacement as the same part number you posted.

       

      http://eknclassic.com/viewtopic.php?t=109564&postdays=0&postorder=asc&start=15

    • May 3, 2017 at 10:25 am #81198
      Steve Frank
      Participant

      Thank you Matt, I find the topic search feature here a bit fumbly at times. Good info on the squish info in that post as well.  I’ve already made that adjustment with the gasket set.  The piston I have is in fact the same as the picture you posted and the ring gap is indeed directly in line with the port. Also, rummaging thru my leftovers, I found a Vertex RS piston that also had the ring gap in the same location as the 2005 Honda OE.  (it was seized in the piston of course, I hope that’s not a bad omen)  However, all of the HRS all have the ring gap placed at 7 o’clock in the bridge.  We’ll run the 05 piston and see how it works.

    • May 15, 2017 at 1:07 pm #81686
      bo rougeou
      Participant

      Sorry I took so long to respond, but you are correct.  I had to track down an RS piston.

      The RS piston has the ring gap at a bridge and the 2005 piston has it in the gap portion of the intake.  That said, the 2005 ring gap looks to be supported pretty well by the bridges on each side and the gap perfectly in the center of the intake.  I have run many of these 2005 pistons and I have never suffered a problem from the the ring gap.

      This is the cool side of the piston.  I would look for problems on the exhaust side,particularly the top of the exhaust bridge showing a little cracking.  This will catch a ring in a New York second.

      I have been told that drilling a couple of holes in the 2005 piston to cool that bridge won’t hurt(RS piston sports two tiny holes).

      So, that being said, I haven’t seen a problem with the ring gap you describe.

       

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