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 Videos

Lightweight pistons & lifters, longer rods, copper gaskets & street performance demo.

 

Doug MacRae on the Herb Becker built 1972 Norton 750 Commando short stroke with JS lightweight pistons and longer rods in the BEARS race at Barber Motorsports Park, Oct. 2015. "I led the good part of the race but blew my primary belt on the last lap".

 

Leak down test with JS pistons and total seal rings.

 

Keihin CRS smoothbore carb for demo for Nortons.

 

Norton race engine build - lower end.