 Stock YSR is designed to provide an easy, low cost way to participate in mini roadracing. Minimal modifications ensure close racing and showcase rider talent, not mechanical skills or machinery. Stock YSR will run in conjunction with Stock NSR, and sometimes with Stock XR100.
● If it does not say you can do it YOU CANNOT!
● Engine maintains overbore permitted to 57cc
● Must use OEM engine no modifications, crankshaft may be balanced and welded
● Must use OEM chassis no modifications to frame or swingarm
● Must use OEM exhaust no modifications
● Must use OEM clutch basket any plates and springs allowed
● Must use OEM carburetor no modifications, new jets/needles permitted
● Must use OEM airbox may remove noise suppression cover and snorkel may install 12 ¾ inch filtered vents
● Must use OEM ignition components (no offset flywheel keys)
● May use any 14mm spark plug
● May use any direct replacement spark plug cap
● May use intake reeds (no modification to reed cage)
● Must user OEM gasket or direct sized replacement
● May remove oil pump and reserve (must fill hole with effective oil seal)
● May remove kick starter (must fill hole with effective oil seal)
● May change gearing
● Must use OEM forks (internals can be changed, fork brace may be added)
● May use steering dampener
● Must use OEM triple clamp (any top clamp may be used, any bearings may be used)
● May use any clip-ons (must mount above triple clamp)
● May change controls
● May use any body work
● May use any shock mounted to stock position
● Must use DOT 12” tires (no slicks)
● May use any hubs and rims
● Must remove all lights and turn signal
● No Oxygenated Racing Fuels
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