JS Motorsport
 
 
motorcycle
HIGH-PERFORMANCE
PARTS
FOR NORTON TWINS
JS Motorsport
4480 North Academy Avenue
Sanger, CA 93657
Phone/Fax: 559 875 0659
Email: jim@jsmotorsport.com
JS Motorsport Technical
TECHNICAL LINKS
Lightweight pistons and longer rods Ultra-lightweight pistons & rods Cutting pistons for squish band
Camshafts, lifters & pushrods New JS2 (PW3) gradual ramp cam XR750, Full Auto, Axtell ports
Keihin carbs Beehive valve springs modifing your own valves for Beehive springs
Reed valve breather Fork damping sleeves Norton fork upgrades
Compression Balance specs Weight/Vibration savings
Piston weights, lifters & valve spring comparisons
BIKES AND BUILDERS
The Ultimate Norton Motor Most successful Norton racers Fastest 750 production bike at Bonniville
Monoshock & Twinshock chassis Engine builders
VIDEOS
Piston demo street run Piston leak down test Doug MacRae/Herb Becker roadrace
Keihin Carb demo Reed valve breather Norton race engine build, lower end
Norton race engine build, cylinders and lifters