Just bought a 1982 CB750K

[Superflymx]

Just bought a really clean 1982 Honda CB750K with 20000 miles! So happy I just wanted to know and this might be a easy Question be what does the K mean? I see CB750C CB750F CB750K CB750S can someone tell me what the C F K  S mean ? Also I want to know what the best oil to use ? Thanks you!!

[TOOLS1]

There is not really any meaning to the letters, just model designation. As for oil, that is a loaded question. I use Texaco Havoline 10W-40. And change it every 3,000 miles. My engine is spotless inside!
TOOLS

[seestheday]

K is the base model
F is the sport model
C is the "custom" model

Honestly not a lot of differences between the models other than trim packages.

F/supersport model did have dual disc's up front and a rear disc where the K had a single disc front and rear drum.

I believe the F had stiffer valve springs.

F also had a slightly different frame and comstars, where the K had wire wheels.

[seestheday]

Oh and for oil I use Rotella T.  Whatever you choose, the main thing with oil is that you have to make sure you never put synthetic oil in that has friction modifiers.

[LukeM]

General rule about engine oil for MCs:

IF you choose to use car engine oil for your MC engine, avoid oils that have the words "Energy Saving" or similar on the container.  These will impact your clutch's performance, since for these engines, the clutch and engine share the same oil.

You won't go wrong by using an oil made just for MCs.  It'll just cost you quite a bit more.  The stores sell WAY more car oil than MC oil, so they can charge less.  Same with filters.

I also use Rotella 5w40 in my bike, and like it a lot.

Luke M

[Hoosier Daddy]

What a beauty she is... congrats!
The only one I am not accustomed to is the CB750S. Unless you are referring to the Nighthawk that was the CB750SC introduced in '83. I have also heard of an "N" model from members across the pond that was a European only model I believe.
 As far as oil goes, I play it safe and stick to the Motorcycle spec oils, wether it comes from Texaco, Castrol, or Mother Honda because of the previous statement that Automove oils have friction modifiers that are not recommended for our clutch packs. I corrected a member here once for using Texaco Havoline in their bike, thinking it was an car oil but now see their Motorcycle 4T oil in the stores and used it this last time.

[motogrady]

sweet bike, geez.

the f models, i think a bit more hp, taller gearing, something else I can't remember.
the c, or chopper, or custom, small rear wheel so it sits low
the k, the standard bike

[shinyribs]

Welcome to the party,Superfly. Gorgeous bike you got there!

There's a million different opinions on oil. The part about friction modifiers is fact,though. Cannot use those at all. Air cooled bikes,such as these,can really beat up on engine oil in warmer riding weather. Thicker viscosity couldn't hurt.

[Superflymx]

Thank you Everyone For all your help! I am so happy I found this Forum I am Feeling The Love!!! This bike is smooth and quick so much fun to ride!!!! I can see why The CB is so loved!

[icerigger]

+1 for the Rotella. Originally spec'd for diesels it'll take the punishment of an air-cooled engine. It was used for years in bikes before it received API SF/SG.

[zack]

I have that exact same bike--same color, same luggage rack, everything. It's a beaut!