Cylinder Head schematic Honda Cb750 Nighthawk 1992 Usa

Replacing the old overworked exhaust and inlet valves when rebuilding the engine is a sensible precaution, the old valves become brittle and can break off around the valve head area, allowing whats left to drop onto the top of the piston causing untold and very expensive damage!
Renewing these VALVE-GUIDES at the same time will help ensure the engine remains smoke free, especially on start up!
Related items you may wish to view:

12205MJ0315
12205MJ0325

When ordering this OIL CHAMBER PLATE consider ordering genuine Honda Gaskets. This means buying gaskets made in Japan to Honda quality control standards. This also means fitting the same gaskets that were deemed good enough by the factory when the machine first rolled off the production line.
Please note these parts are in short supply - order now to avoid disappointment!

After disassembly, always use new genuine Honda gaskets during the rebuilding process, if only for peace of mind, there is nothing more annoying than oil mist spoiling the appearance of the engine!

Rebuilding engines is easy - well not exactly, but certainly easier when as many old internal, and in this case external parts are substituted with new!
These can become clogged and blocked over time - easier and safer for the engine oil feed to simply renew!
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15515MJ1023
15516MJ1000
15517MJ1000
15521MJ1770
15522MJ1770

The CARBURETTOR INSULATOR needs to be in good condition with no damage, especially on the inner face where gas flow is so vital for top performance. They degrade with temperature extremes and vibration over time - renewal is often the only way to ensure that minimal amounts of heat and vibration reach the carburettor.

It always feels almost therapeutic to replace a degraded damaged rubber part with a new genuine Honda part, you are even reluctant to throw the original Honda packaging away, with the part number written on, you know, just in case!
Check out this related item:

16214MJ0010

Enjoy the tactile pleasure in fitting a brand new, clean and shiny, genuine Honda INSULATOR BAND. It looks better, it does a better job, and was fitted to your machine when it first rolled of the production line.

Specifying only genuine Honda bolts will ensure the steel is correctly hardened and the way the bolts fit will be perfect. Using another make of bolt may or may not deliver these important properties!
Another similar item you may wish to order:

90093KF0000

A new genuine Honda 5mm WASHER is a guarantee the correct grade of materials used in the manufacturing process.
For other new parts to make your task easier and with better results check out our on-line schematic for your model.

Specifying only genuine Honda O-RINGS means buying seals made in Japan to Honda quality control standards - Seals that were deemed good enough by the factory when the machine rolled off the production line.
This is the 10 x 1.6 O-RING
Other O-RINGS you may wish to consider:

91301107000
91303107000
91335567000

Seals, gaskets and other consumables, why not check our on-line schematic, or if your machine is not supported this way, simply browse the on-line Gallery; this which will list everything you need for a successful overhaul.
This is the 30.8mm O-RING.
Other O-RINGS you may require:

91301426010
91310426000
91304286000
91319323000

Specifying only genuine Honda screws means buying parts made in Japan to Honda quality control standards - Screws that were deemed good enough by the factory when the machine rolled off the production line.
This is the 5 x 25 PAN-HEAD SCREW(G).

Specify GENUINE HONDA fasteners including these precision engineered DOWEL and LOCK PINS and you will be fitting the very highest quality items that will be both easy to fit and enjoy long term durability - Reusing the old items is not advisable!
This is the 8 x 14 DOWEL PIN.

Your overhaul will be easier to execute and with a more professional outcome when you specify new genuine Honda parts like this 6 x 12 SOCKET BOLT rather than making do with the old corroded, maybe slightly damaged item!
For other new parts to make your task easier and with better results check out our on-line schematic for your model.