Back to Sohc CBs
![]() |
![]() |
I purchased this 1973 CB750 from a good friend for $300 about 8 years ago. It was originally nothing more then a frame and baskets of parts. My friend raced the bike when he owned it so it would need some work to make it more appropriate for the street. Since the bike was raced, the engine had already had some mechanical work done, such as a Yoshimara cam, complete Barnett clutch and 120 jets. But I wanted more so I decided to drop in 4 1969 CB450K1 pistons that I had gotten for an awesome deal. I also enlarged the combustion chambers, the intake valves and the exhaust valves. I sent the engine to Mongoose machine shop for its total makeover. I bought a complete gasket set and built up the engine. I decide I should replace the points and condensers because they were old and pitted. One it was complete, I had it painted gloss black and put it aside and started on the frame. I removed all of the remaining electrical system and completely rewired the bike myself, I removed the original rectifier and regulator and put in an all in one unit and a set of coils from a 1981 750. I then removed the original rear tire and replaced it with a 16 inch rim and Avon tire. I lowered the rear by cutting the stiffer springs which were already installed for racing. I was lucky enough to already have half of the dual disk setup done for me, to finish the setup I had to purchase a brand new master cylinder and steel braded lines. I needed a new seat so I decided on a king queen seat that was at an irresistible price along with a new set of chrome super sport bars. It was now time to drop in the complete engine. Once the engine was in I decide on a Kerker 4-1 exhaust setup and 4 custom made velocity stacks. As I was near finishing the mechanical aspect of the bike, the bodywork and painting was being done. I decide on the color Wimbledon white with no Honda emblems, which I felt gave it a clean simple look that would catch anybodies eye. After installing the body work I did a couple basic things such as installing new fuel lines, adding the oil and a brand new battery with 210 cranking amps. I was thrilled when I heard it run for the first time and was very satisfied with my workmanship considering everything worked as it should of, the engine work brought the total horsepower to 90 and raised the redline to 11,000rpm. In my opinion the project was a complete success and I am very happy with the final result. It is still going strong after 6 years without any complaints.
Brian
![]() |
![]() |