BSA Gold Star 500cc Parts Book

Service Information 113 January 28, 1963 GOLD STAR RACING DATA l. Piston clearance .006" ... Use BSA 10 to 1 slipper type piston, 65-2247. 2. Tappet clearance .006" inlet and exhaust. 3. Carb. main jets - range #460 to #520 - l~ G.P. carburetor. 4. Garb, slide {f5. 5. Third needle groove. 6. Lodge R.L . 1149 or R.L. {!50 - K.L,G, FE /1290, 7. tvlagneto point gap .012". B. Spark advance 39 degrees. (Up to 42 degrees spark advance has been used successfuly). .., 9. Daytona cams - 65-2442, inlet -- 65-2446, exhaust. 10. Lighten the rocker arms, lighten ends of push rods. Timing gears can be made narrower. 11. Assemble S & W racing valve springs, (in:stock). Part No. B613 - • one pair. 12. All parts should be polished to a mirror finish. The w·ork can be done by chrome plating firms. j 13. Use Daytona close ratio gears in gear box. ~ 5.-00 oo ..,1-Novi ces , 4.83 to l f~e..u.r., 1,-:·75: · tö - 1 fe ·r- -Exp:ert s·. ,..,.- 14. Use BSA Racing Oil for more complete sealing . Holds its body longer -- gasoline does not dilute it. (Oil and engine must be thoroughly ·warmed-up before running at h1.gh R.P.M.). 15. Líght,veigh t flywheels have been used successfully. Fl}'lvhe el • &.1... shaft, right side 8 pounds 10 ounces. W1Ll1 Flywheel with shaft, drive side 9 pounds 5 ounces. Diameter 7" Width 1-1/ 16" Balance Factor - 65% 16. "Tuning for Speed" : Fourth Edition "Speed and How to Obtain It" Eighth Edition and Gold Star Maintenance Manual consists of helpful information. WB/j e