Overview Product Description OEM replacement valve locking nut / rocker adjuster jam nut for the Tillotson 196RS and 225RS engines. Product Videos Custom Field Product Reviews Write a Review Write a Review × Tillotson Valve Locking Nut Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *