Valve Guide Stem Seals for 6mm valves as fitted to Laverda 350 and 500 models.

8 x Green Viton Metal Jacket for controlled oil metering to the valve stem.

Viton offers excellent resistance to both heat (up to 450° F) and abrasion.

Suits guides with Seat Ø 8.3mm, Outer Ø 11.5mm, Overall Height 8mm

Valve stem seals provide a controlled leak of oil to allow the valve stem to be lubricated as it slides in the valve guide. The amount of oil that passes by the valve stem seal must be precisely controlled, as too little oil causes stem and guide wear. Too much oil causes carbon buildup leading to valve seat damage, decrease in volumetric efficiency, increased emissions and excessive oil consumption.