Mushroom Head Tappet Adjusters - Choose Make / Model / Year Make - Model - Year:Triumph / BSA - Triples (1968-73 - Short Type) - Allen Key End Type there may be some slight

there may be some slight pitting

Also fits Triumph 650 & 750 Unit Twins (Bonneville

Fits most BSA A50 & A65 models (Lightning

Measures 1

Mushroom Head Tappet Adjusters - Choose Make / Model / Year Make - Model - Year:Triumph / BSA - Triples (1968-73 - Short Type) - Allen Key End Type there may be some slightHave you took apart your top end and noticed the ends of your valve tips have wear marks from the tappet adjusters? Although that is normal wear from usage the factory could have designed some better tappet adjusters. The problem The problem with the old style tappet adjusters is the design of the head. The head is flat and square. It does not contour the valve very well which "digs" into the valve stem and over time causing your valve stem to wear