Topic: One Piece at a Time CB750

[R1gg5]

I've finally found some free time to start working on this bike. I replaced the harness with a good used one- the harness on the bike was taped, soldered, spliced and otherwise hacked quite a bit.

Where I ran into trouble, was the wiring in the headlight bucket. The PO had cut most of the plug receptacles off the parts that plug into the harness, so I still had my work cut out for me to try to match up the wires in the correct manner. I'm going to take a couple of photos and make some notes with questions later today - and hope someone can take a few minutes to correct the problems I've got. At the moment, I only get working head and taillights and NOTHING else. No ignition, turn signals, etc.

I also replaced the points/condensor plate with a new Honda unit, and I set the basics (gaps and general timing). Since I have no spark yet, I can't fine tune the timing right now.

Photos coming, and please, if you can take a moment to point me in the right direction, that'd be so cool. I really want to hear this motor spin up to life!

[lucky]

You do not need a new wiring harness unless you are doing a complete restoration.
All of the wiring harnesses for the CB750 SOHC from 1969-1978 are very similar
except for the left hand control and some minor headlight wiring stuff.

I did a complete restoration using the 1975 Parts & More wiring harness and it was all plug and play except the left hand control.
I think the starter safety switch on the left hand control stuff was a little different.
Easy wiring harness and very simple 3 fuse fuse panel.

[R1gg5]

I had this bike running after rebuilding the carburetors and figuring out enough of the wiring challenges. Unfortunately, when taking her on a test spin around the block, the chain broke and snapped a sizable hole in the gear box, ruining the motor.

After many weeks of trying to locate another engine for the bike, I came across a 75 CB750F basket case with an (apparently) good motor for $250.00. The motor is not an F motor - it's a 76 motor from a K type bike.

Now that I have the F basket case, I wonder if I should build up that bike instead of the 71 K. I don't have the tank or seat pan for the 75 F, but just about everything else is there. The rear disk brake doesn't activate when pressing on the foot pedal - indicating that it's likely that the brakes will need to be fully rebuilt to get them working.

Regardless, my plans for the next step(s) are to strip the bike down completely and get various parts sent off for paint, powder and/or plating. So either frame should be a good candidate.

I won't be doing a natural restoration - neither candidate is ideal for a restoration, so I'm looking to probably build a mostly stock bike with a few modifications with aftermarket parts or parts from other CB750 years. For example, I'm using Norman Hyde "M" bars.

I'd love to get opinions on the frame question and thanks for taking an interest in my project.