The Problem:
Honda CB750 F Supersport models have several problems with the top ends.
They wear out valve guides prematurely, the valves are unleaded fuel unfriendly, the top valve spring retainers are stamped steel and can pull the keepers through causing a valve to drop in the motor.

The Fix:
Cycle X Cast Iron Valve Guides:
Kibblewhite manufactured cast iron guides are made from the best hardened material available. The guides are 49.50 mm in length for added support and longevity.
 
Cycle X Intake Valves:
One piece forged, high nickel stainless, swirl polished and nitride coated.

Cycle X Exhaust Valves:
Kibblewhite manufactured exhaust valves received ours and Kibblewhite's full attention because the exhaust valves and guides are the biggest problem. These specially designed exhaust valves have great flow characteristics and combined with Kibblewhite's proven black diamond process makes these valves the best money can buy.

Cycle X Valve Seals:
Perfect for this combination of valves and guides.

Cycle X Retainers:
Honda CB750 77-78 K's and especially F2's have the potential of the keepers pulling through the top spring retainers and dropping the valve into the motor. Many people have felt this heartbreak for the past 30+ years. Honda's later model spring retainers are stamped steel, combined with a steep keeper angle, has only been addressed by complete spring kits costing hundreds of dollars, until now.
 We have been working with Kibblewhite and have developed these top retainers to cure this problem once and for all at a reduced cost.