1980 CB750c Valve adjustment questions

[AGENG1]

Hey everyone,
Im looking to measure the clearance on my '80 CB750c. I downloaded the relevant manual section from the shop manuals section here and attempted the procedure. It didnt really go well.

I noticed on the manual header, it references the CB750k. Will the steps still be applicable to the 750c? I ask because when im rotating the crankshaft to get it into the (assumed) correct positions, it appears the cam lobes are making contact, or flat out pressing against the shims on the valves that i believe i should be checking.

My assumptions are as follows:
there is a white paint marking on my exhaust side cam (right end), that i am using to align per the manual (i saw no other visible marks).
the cylinders are in order from left to right when sitting on the saddle (1, 2, 3, 4).
Exhaust valves are towards the front of the motorcycle (by the exhaust) while intake valves are towards the rear (by the carbs).

I have never performed any mechanical work on engines before so its all fairly new to me. Just want to make sure that im not missing something and jumping to conclusions. I have attached some photos of what im seeing (camera phone) & the excerpt of the service manual i am using.

Id appreciate reading your thoughts about this.

 

[pidjones]

Hard to tell by your photos, but there should be a notch out near the OD of the journal that you line up with the split. Lobes should point (not directly, but close) away from the shims and most say to change your center value to .005" instead of .003" due to the valves pounding into the seats. If too small, the risk is burning a valve. Highest risk is on exhausts. Don't be surprised that on a poorly-maintained engine, there are several with zero clearance. C should be same as K and F on the DOHCs.

BTW, there are DOHC sites that specialize in them.

 

[AGENG1]

pidjones,
Thanks for the insight and confirmations. Ill continue working through this.