Through years of extensive testing on both road and track, JS Motorsport has developed high-end products in a modern format that will increase a Norton’s performance, reliability and rideability. JSM lightweight pistons & rods give you the smooth running Norton of your dreams.
Showing 61–72 of 111 results
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Four Banded, spring loaded Viton valve guide seals – install by hand.
$12.00 Add to cart -
Special short lash cap set to fit valve tips for JS Beehive springs. For those who modify their own valves without stellite tips. Also fits stock valves (not necessary for stellite tipped JS valves).
$14.00 Add to cart -
One piece aluminum rocker spindle cover set with SS allen screws & alum washers (see silicone gaskets)
$49.00 Add to cart -
Raised intake D port floor alum shoes and teflon heat insulating gaskets (2 ea) for increasing flow and performance for 850 RH4, Combat and all 32mm port heads
$79.00 Add to cart -
Raised intake D port floor alum shoes and teflon heat insulating gaskets (2 ea) for RH10 and all 30mm port heads. Some raised porting may be required to increase performance.
$79.00 Add to cart -
Raised exhaust D port floor iconel steel shoes (2) for increasing flow and performance for all 650s, 750s & 850s
$54.00 Add to cart -
Digital download of Narley ports with over 50 photos and drawings of high flow ports. “Full Auto”, “Axtell”, “Harley XR 750” and stock Norton ports included. A Street version is also included with suggestions for re-angled valves or stock size valves. AutoCad 2000 or later (or online drawing converter) required to view the drawings. Be sure to hit the “Narley Ports” button under “download” at checkout, then check your “downloads” folder.
$5.00 Add to cart -
Thumb drive of Narley ports with over 50 photos and drawings of high flow ports. “Full Auto”, “Axtell”, “Harley XR 750” and stock Norton ports included. A Street version is also included with suggestions for re-angled valves or stock size valves. AutoCad 2000 or later (or online drawing converter) required to view the drawings.
$10.00 Add to cart -
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Fiberglass reinforced high temp silicone gaskets – the ultimate gasket solution
Select Options -
Custom 750- 920 Copper Base gasket
$30.00 Select options This product has multiple variants. The options may be chosen on the product page -
Custom Thickness 750-1000 Copper Head Gasket (add pliobond sealant – not included)
$40.00 Select options This product has multiple variants. The options may be chosen on the product page
