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Nsr250 PGM3 Spacers

  The Myford saved the day again. PGMIII spacers on the lathe and grommets on the 3D printer. 

Nsr250 Mc21 Pgm3 Rubber Grommet

STL and 3MF files for 3D printing the Pgm-III rubber grommets. You can download the files in the below link : Nsr250 Mc21 Pgm3 Rubber Grommet - printables.com Description This is the “GR2” rubber grommet that along with a metal bushing and a screw, keeps the PGM-III unit in place.  A suitable material for the application is TPU (thermoplastic polyurethane), a flexible filament with excellent vibration-damping properties, high toughness and chemical resistance. The grommet will be a little bit stiffer than the OEM part, so if you wish you can use TPE filament instead.  Please, tune your printer with the below settings for optimal results :  Plater :  Print Settings : 0.15mm Quality Filament : SainSmart TPU Supports : Everywhere  Infill : 10%  Layers and Perimeters :  Perimeters : 1  Solid layers, Top & Bottom : 5 & 4  Infill :  Top and Bottom fill pattern : Concentric   It is also possible to print the grommet on its side with a small portion chopped off, as to provide a flat p

Tzr250 F-III YEC Racing KIT Part, YPVS Control Unit

I just finished the repair of an ultra rare YPVS control unit, that belongs to Dan(UK).  I have repaired quite a few TZ250 ypvs units and also Rz500 YEC prototype units but I had never seen this one. It is an official F3 Kit part for the Tzr250 1KT - 2MA bike. Of course, it does feature it' s own unique racing exhaust valve timings, as to accompany the rest of the kit parts.  You can find the Tzr250 KIT manual, in the below link that is also an excellent resource for all Yamaha 2T street bikes :  pure2strokespirit.net  

Two-Stroke Performance Tuning Book by A. Graham Bell

  Two-Stroke Performance Tuning Book by A. Graham Bell (Haynes Publishing, 1999)

Tuning Vespas by Norrie Kerr

  Tuning Vespas, The Norrie Kerr Way (Scooter and Scooterist, 1996). 

Motorcycle Tuning Two-Stroke by John Robinson

  Motorcycle Tuning Two-Stroke by John Robinson (Newnes, England, 1994)

Two Stroke Exhaust Systems by Roy Bacon

  Two Stroke Exhaust Systems by Roy Bacon (Lodgemark Press, England, late '60s).

The High Performance Two Stroke Engine by Dr. John C. Dixon

  The High Performance Two Stroke Engine by Dr. John C. Dixon (Haynes Publishing, 2005)

Improving Two Stroke Engine Performance by J. W. Vierdag

  Improving Two Stroke Engine Performance by J. W. Vierdag (Longemark Press Limited, Kent, England)

Tuning your Two Stroke Engine by K.G.Draper

Tuning your Two Stroke Engine by K. G. Draper (Coles Publishing Company Limited, 1977).