Carby Reed Valve on stock Nt carb with billet intake

Discussion in '2-Stroke Engines' started by Rconce01, Jun 5, 2012.

  1. Rconce01

    Rconce01 New Member


  2. vermhot

    vermhot Member

    Hey dude the site don't work !!!!!
     
  3. jaguar

    jaguar Well-Known Member

    Putting holes in the piston is essential. The boost port is not essential but does give a mild power gain. Stuffing the crank is essential for top rpm power. If not then all the power gains with a reed are just at low rpm.
     
  4. Rconce01

    Rconce01 New Member

    it works
     
  5. Rconce01

    Rconce01 New Member

    Nice thanks! Any top speed improvements or power increase?
     
  6. Fabian

    Fabian Well-Known Member

    Holes in the piston with a reed valve intake may be beneficial for top end performance but the top end performance requires higher rpm and these chinese made pistons are of questionable quality, especially when causing stress risers in the piston from the drilling process.

    Below 5,000 rpm, a piston window may provide little benefit. In saying drilling out the piston is "not essential" for low to mid range rpm operation.

    If wanting significantly higher power, together with the higher rpm requirement it's best to overlook the Chinese engine and purchase a Morini engine; designed specifically to be a high power unit.
     
  7. jaguar

    jaguar Well-Known Member

    yes the holes benefit top rpm mostly but I think you'd see some difference even at 5000 rpm. These pistons are not any weaker than other pistons. I have one of them that I drilled 14 holes in and had it in an engine that rev'd to 8000 rpm. no problemo.
    But these pistons do give two good reasons to seek an alternative replacement. They have 2mm thick rings whereas some pistons have 1mm thick rings. More contact area of ring to cylinder means more friction and wear. They also have excessive ring end gap that means compression loss. I posted about an alternative piston that gives a good compression boost. check it out.
     
  8. vermhot

    vermhot Member

    Thanks I got it now !!!!
     
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