These are a direct replacement for the original steel retainers on the:
1985-1991 Yamaha FZ 750
1987-1988 Yamaha FZR 1000 Genesis

Does not fit FZR 1000 EXUP and Thunderace engines - we also have these available.

20 Titanium retainers made of best grade titanium - Grade 5.
 
The original retainers weight 4.1g and the titanium retainers weight 2,9g
 
These retainers have a smaller profile/height (0,5mm shorter) to allow for more valve lift without contact with oil seal and without requiring valve guide modifications.

Using lightweight titanium retainers allows for more aggressive camshaft profiles (lift and duration) without losing control of the valve and increased rpm limits - a must for any performance / race engine.