SPEC SHEET FOR: JIM MOSHER’S 58" STROKER "SUPER SCOUT".

  1. Dry Weight = 330 Pounds.
  2. Made up entirely by owner from left-over parts from many vintage bikes, from different eras.
  3. Frame: Front half is from a 1956-1959 Triumph 650, the Rear half is from a 1937-1952 Triumph 500 Speed Twin (hard-tail).
  4. Forks: Betor brand, used on a 70’ Bultaco Alpina trials bike, with shortened progressive springs for a Triumph Bonneville. It uses 30 weight oil.
  5. Fenders: Rear is from a 1952 BSA 500 with the valances removed, and some extra trimming. The Front is a bobbed BSA 441 Victor fender. Custom made fender stays front, and rear.
  6. Tanks: Original Scout tanks, narrowed 2 1/2" with 2 3/4 gallon capacity.
  7. Paint: Paint, and body by owner! Color is Black fenders, chain guard, and battery box, and the tanks are in 1952 Studebaker "Corral Red", with Gold water-slide decals.
  8. Lights: Front is a "Chopper Era" 5 1/2" 30/30 Watt, and the rear is an original "Sparto" from England. Both 6 volt.
  9. Wheels: Front is a 1968 Triumph 650 Bonneville dual leading shoe brake/hub on a WM-2 X 19" Borrani rim, and the rear is a 1968 Triumph 650 Bonneville brake/hub on a WM-3 X 18" rim. Rims are like Moto Guzzis.
  10. Tires: Rear is a Dunlop "Sport Max" 4.50 X 18", and the front is a Michellin 3.50 X 19".
  11. Controls: Bars are Norton European Touring bars, levers are Thommaselli (like Moto Guzzi), throttle and grips are from a Lectron flat slide H-D kit, and spark advance control is a BSA Goldstar compression release lever.
  12. Charging System: None! Total Loss. I use a 6 volt 12 amp battery in an Indian Chief tool box. Good for 30 minutes of headlamp on a full charge. Brake light lasts a long time! Magneto needs no power to make spark.
  13. Seat: Vintage Bates solo saddle (the small one) mounted to Scout seat springs. Covered in leather.
  14. Speedo: Trail-Tech digital speedo, and trip computer combo.
  15. Motor: 58ci, or 955cc. Cases are 741 500cc military. Flywheels are late Chief "Z" wheels with a 4 7/16" stroke, and balanced at the 60% factor. It uses Kiwi's shortened pinion pin/housing combo for the stroker job. Rods are the military Scout, also used in the 841. Cylinders are the late Sport Scout type. Heads are the late Sport Scout (milled, and re-shaped combustion chamber for 7 7/8:1 compression).
  16. Cams and Lifters: Late Bonneville lifters with "Shunk" Scout dirt track racing cams repositioned for optimum performance with special off-set indexing pins. Lift is .365", and duration is 300 degrees.
  17. Pistons: Venolia forged pistons (.040" over-size), Teflon coated skirts, and ceramic coated tops. Piston tops are .125" above deck at TDC. Cylinder to wall clearance is at .006", and Total-Seal rings are used with .012" end gap on the (2) compression rings.
  18. Valves: Stainless Steel Valves with the DLC (Diamond-Like-Coating) good for 3,200 degrees F on the stems, and special bronze valve guides for severe duty use.
  19. Carb and Manifold: Carb is a Keihin 41mm CV type carb with the Dyno-Jet kit installed. Manifold is the ported Bonneville type. A K&N filter is used in an air cleaner made from a narrowed Sportster "Ham Can" cover.
  20. Pipes: Custom 1 3/8" dual pipes, each 36" long flowing into custom glass-pack megaphones (made by owner!).
  21. Magneto: Joe Hunt preped Morris magneto. Blueprinted for 42 degree seperation, and at 25 degrees full advance.
  22. Pump/Sump: 1946 Iron pump with a 1947 style scraper sump. An "Old-Iron" oil filter is adapted.
  23. Transmission: 1956-1959 Triumph 650 "Pre-Unit" Four-Speed with foot-shift.
  24. Primary/Clutch: 1956-1959 Triumph 650 "Pre-Unit", with 1973 Triumph clutch. Easy-Pull cable reducer is also used for softer feel.
  25. Other Special Stuff: Dual Krank-Vent breather system, 1/8" longer spiral groove push rods, Chief O-Ring valve covers, 1/8" stroker plates.

 

Overall Impression: This is an easy to start bike, that is simple to operate. It is light, and nimble, and the brakes are great. It appears to be very small, but a 6 foot person is very comfortable on it. The motor, while capable of calm touring, becomes quite aggressive when the throttle is pulled-on. It makes a lot of quick power, making the whole package seem very quick, and slightly under sized for the motor. I have it geared very tall, and speeds over 100 are easily achieved. I don't know how fast it will go, but at 5,500 RPM, it would be near 130 MPH. I'm sure it will do it, but I don't like to punish my bikes!