This kit solves the upper revs flat power curve in race motors: the more the engine can breath adding airbox, stacks, cams and all the usual add-ons, the more its power curve looks flat at top revs.
Chooking point is stock exhaust valves size: fitting those valves will un-leash the engine top end.
Made in Nimonic alloy for maximum durability.
The kit includes:
4x 27mm Nimonic exhaust valves
4x Specific super-finished springs.
Who This Product is For
This valve kit fits all model year 21-26 RS and Tuono 660. Valves can be intalled on stock pistons but valve cut-outs are bit tight: better use our HC pistons, available in both 81 and 82mm size
It’s a race product, it needs a proper assembly with valve seats and exhaust ports modify.
Technical Details
Uses stock lower valve spring shim, upper collet and half-cones.
Valve seats’ throats and angles rework instruction supplied.
