RZ350 YPVS

For some of you this is it, the best most versatile bike on the planet.  Maybe streetbike anyway.  I’ll still take a 1995 TZR250 but here’s wishing.  Quite simply the most fun one can have on the street.  Yamaha produced the RZ350 from 1983 to 1995.  The last models sold in Brazil looking a lot like the FZR of their time.  Integrated YPVS and loads of power in a lightweight package the RZ350 packed a serious punch against many of its bigger cc brothers.

WP has tuned several of these little monsters to incredible levels.  The following Phases of performance tune are designed around your riding style and the use of the bike.  WP has developed multiple porting specs for this engine to suit a wide variety of uses of the bike.

Blueprint

  • Basic Blueprint rebuild of the stock engine. What Yamaha should have done.
  • Intakes
  • All ports
  • Tunnels
  • Gasket match cylinders to top case
  • Exhaust port de-flash
  • Reed cages
  • True and Weld crank (extra)
  • Set proper squish clearance


Phase I

  • Intakes Cleanup
  • Port Specs to suit
  • Minimum required port spec to tunnel porting
  • Gasket match cylinders to top case
  • Match and polish exhaust port to exhaust pipe manifold
  • Deck cylinders / mill head to get proper squish clearance
  • True and Weld crank (extra)
  • Uses: Wiseco pistons NO piston modifications, TDR reeds in stock blueprinted reed cages or client preferred reed cages – V-Force, Boysen, etc. extra. Stock intake boots.
  • Recommend 28-32mm carburetors


Phase II

  • WP intake modification and cleanup
  • Port Specs to suit
  • Full tunnel cleanup
  • Gasket match cylinders to top case
  • Match and polish exhaust port to exhaust pipe manifoldIMAG0614
  • Deck cylinders / mill head and re-cut squish band for higher compression and proper squish clearance
  • True and Weld crank
  • Uses: Wiseco fully balanced pistons, TDR reeds in stock blueprinted and polished reed cages or client preferred reed cages – V-Force, Boysen, etc. extra. Stock intake boots.
  • Recommend 28-34mm carburetors


Phase III

  • WP intake modifications cleanup and polish
  • Port Specs to suit
  • Full tunnel cleanup and polish
  • Boysen ports through the intakes
  • Gasket match cylinders cleanup and polish
  • Match and polish exhaust port to exhaust pipe manifold
  • Deck cylinders / mill head and r-cut squish band for higher compression and proper squish clearance
  • True and weld crank
  • Uses: Wiseco fully balanced pistons, TDR reeds in stock WP modified reed cages or client preferred reed cages – V-Force, Boysen, etc. extra. Polished intake boots.
  • Recommend 32-36mm carburetors


If you really want to blow the doors off the competition or that pesky 750 GXer down the street WP can build a custom RZ engine using aftermarket big-bore cylinders.  Up to 496cc killer streetbike sleeper cause it still says RZ350 on the bellypan!

Let WP take care of your beloved RZ and show it the care only you and those who appreciate these fine old streetbikes can.