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Converting an R5 roadbike into a TR 3 racer special.
There are a number of similarities
between the R5 roadbike and the TR3 production roadracer which allow the
roadster to be converted into a competitive racer. In 1972 Yamaha released a
bulletin on how to complete this conversion. Below is essentially a transcript
of that bulletin. Please note, a number of these parts are no longer available
through Yamaha. Check with your local dealer.
Please check the part numbers with your supplier before attempting to order.
TR3 Special
Model: TR3 (R5 engine used.)
Displacement: 347cc
Bore and stroke: 64mm x 54mm
Number of cylinders: 2
Use: Roadracer or Drag racer
Cylinder Head volume (standard): 17.7cc (Part No. 328 - 11111 - 00 - 00)
Carburettor: VM34 SC (Part No. 328 - 14101 - 00 - 00)
Ignition Timing: 2.0mm BDTC
Spark Plug: NGK B10 EN or EP
Special Parts:
Rods: TR3 slotted (Part No. 328 - 11650 - 09 - 00)
Bearings:
Big End Silver cage (Part No. 93310 - 42255 - 00)
Small End (Part No. 93310 - 21636 - 00)
Crankshaft Mains Special type
Ignition System:
CDI Magneto Assembly (Part No. 328 - 8500 - 10 - 00)
Ignition Coil (2 required) (Part No. 328 - 82310 - 60 - 00)
CDI Unit Assembly (Part No. 328 - 85540 - 10 - 00)
Clutch:
Exposed dry type (Part No. 328 - 16301 - 10 - 00)
Primary Gear (Part No. 328 - 16111 - 00 - 00)
Clutch Primary Gear (Part No. 328 - 16150 - 10 - 00) Use this gear with dry clutch only.
Covered wet type (Part No. 328 - 16301 - 00 - 00)
Primary Gear (Part No. 328 - 16111 - 10 - 00) Use this gear with wet clutch only.
Transmission:
TR3 Close ratio transmission 5 or 6 speed transmission available.
Transmission shaft Special type for racing clutch.
Tacho Idler Gear set:
Bearing: (Part No. 933 - 10215 - 64 - 00)
Gear (Part No. 328 - 15650 - 00 - 00)
Washers x 2 (Part No. 328 - 15653 - 00 - 00)
(Must be installed as a set.)
TR3 Optional Equipment.
Chassis:
TR3 frame (Part No. 328 - 21110 - 00 - 33)
TR3 swingarm (Part No. 239 - 21110 - 00 - 33)
Wheels: TR3 18 inch alloy rims.
Brakes: TR3 four leading shoe front, one leading and one trailing rear.
Fuel tank: TR3 (Part No. 328 - 24110 - 00 - 00)
Front forks: TR3 (Part No. 328 - 23100 - 00 - 00)
Fairing: TR3 (Part No. 328 - 28350 - 00 - 01)
Note: When using TR3 parts in an R5 engine, be sure to check parts book for interchangeability. Many parts are not interchangeable and must be ordered and used as sets.
Port Diagram
Left Cyl. Part No. 328 - 11311 - 00 - 00
Right Cyl. Part No. 328 - 11321 - 00 - 00
All dimensions in millimetres
Tolerance: ± 0.5mm.
Piston Diagram
Piston TR3 Part No. 328 – 11631 – 00 – 96
All dimensions in millimetres.
Tolerance: ± 0mm.
Caution: After cutting off a portion of the piston skirt be sure to check for cracks along the edge of the skirt around the intake ports after each race.
If there is evidence of cracks or extreme wear, replace the piston.
Note: When modifying the piston skirt be sure to modify the intake side only. This will change the port timing.
Expansion Chambers:
Left side Part No. 328 - 14610 - 00 - 00
Right side Part No. 328 - 14620 - 00 – 00
Material thickness: 1mm
All dimensions in millimetres.
Tolerance: ± 1.0mm
Cylinder Head diagram:
Cylinder head Part No. 328 - 11111 - 00 – 00
Note: For prolonged high speed racing reduce the compression ratio by increasing the cylinder head volume to 18.7cc. Remove material in the shaded area (1) to enlarge cylinder head volume.
Want to convert an R5 or RD350 into a TR3 replica?
Jamie Linxwiler shows you how.... Click Here !!
03/23/08 08:24 AM +1000
This website © Greg Bennett 2002.
Diagrams © Yamaha International Corporation
(TR3 photo © unknown. Please email with details if you know.)
