It’s about time I got on to the seat pan. First I pulled out my huge sheet of 18G sheet metal, measured generously the length and width of the bike where the seat will go, and loosely marked it off on the pan.
Then it was time to crank my headphones and cut it all up…And yes, I was angle grinding with my right hand while taking this picture with my left…I wouldn’t recommend this!
Before I started to cut it down to size, I shaped the metal to fit the curves of the frame, this took about 15 minutes of going back and forth from the bike to the garage floor.
Now that the seat pan has been formed, I can start to shave it down to the right dimensions.
Cut trim snip, another 20 minutes of loud noises and tinkering. But it payed off! Just under an hour of work and I have a nicely formed, light, custom seat pan ready to glue some foam to. The little square i cut in it is for the positive terminal on the battery. Due to the close proximity of the battery to the seat pan i didn’t want to risk a short so I cut that area out and the seat foam will be all that ever makes contact.
I still need to weld some short bolts to the under side to go with the mounting brackets I made on the frame. I will also drill several holes for the rivets to hold the upholstery on. The front will get shortened a bit once the gas tank comes back (this weekend) and I know exactly how they are going to interact. But that is all for another time.
Now that I’ve got school done for the summer I can finally make some progress in the shop. First order of business is to install the sweet MAC exhaust that just arrived in the mail.
It has tri “y” headers with a canister style (removable) baffled muffler as opposed to a megaphone. Not cheap…But great quality!
So I mounted it up and rolled the beast out to get a little vitamin D while I begin making a seat pan.
This header design is nice because it allows access to the oil filter and drain plug unlike many aftermarket systems.
If you notice, I also got some genuine italian gran turismo grips installed. Got the clutch perch, cable, and mirror on. Along with the throttle assembly I got from niche cycle. It is very simple and slick while still using the cb750 throttle cable. It’s coming together!
Next I’ll cut out and shape a seat pan.
I finally sat down and finished the wiring, it took me about two hours to do since it was my first time to wire an electronic ignition CB750. I have done a few viragos with EI systems and I can do them pretty quick now. The CB750 was more complicated because it has two separate TCI units. Here is the simplified diagram that I found and used. Gotta love the internets!
I know it looks like a lot of wires but it is really pretty compact since that’s all the wires on the bike, that will all be under the gas tank of course.
I just used one main fuse between the battery and key switch. The master cylinder I installed has a brake light switch built in, so I wired that into the harness so the front brake will trip the brake light instead of the rear. In the past I usually just use the rear switch but it doesn’t look as clean and generally riders use their front brakes more than the rear so it is a bit safer this way.
If you look close you can see that my ground-to-frame is about 2″ long which is awesome 🙂
On an unrelated note, I was walking to go get the mail and as I passed my girlfriend’s parked car something bright white caught my eye below the steering wheel. Upon closer inspection I found this!
Here i’m staying up all night wiring motorcycles and Jazzy is just snoozing in the car! What an easy life.
So like most old bikes I get, the front brake caliper was GROSS, and the master cylinder was shot. I completely disassembled the caliper, gave it a good ultrasonic bath, removed the flaking paint, and got this…
Once they dried I prepped and painted them with good high heat gas/oil resistant paint so now they look like this.
Once reassembled and installed, it looks great and once I hook it all up, should work wonderfully!
I bought 3 master cylinders so that I had a selection to choose from, black vs silver, and different bore sizes. I want the best for my baby!
After that was all squared away I wasn’t sleepy yet, at 1:30am…so I decided to finally get those pesky header clamps off. the deed is done, though it wasn’t easy. This here is an example of why you should ALWAYS replaced exhaust gaskets…
Funny side note, a stock CB125 front sprocket and a stock CB750 front sprocket. Can you guess which is which?
And I will leave you today with this, $80 worth of the highest quality neoprene foam available, this should make about 10 bike seats so it’s really not too expensive when you do the math. It is TOTALLY worth every penny too, it’s extremely comfortable.
Until next time.
Today, only 14 hours after listing my cb400f, she was picked up by a very nice gentleman who was buying it for his father. SO SWEET! I can only hope I have a son one day that buys me vintage cafe racers…
Only got to ride her for one day with the new tires…it was fantastic! I’ll never forget you cb400f…never
GOOD BYE!! *sniff* *sniff*
I was just parking on Dickson yesterday when I noticed my little pip was looking rather nice so I snapped a quick shot before going to my last class of the semester.
By the way I may be considering selling this peach once I finish my CB750 build…we’ll see.
These are a few shots I snapped while on a pleasure cruise I took today. I’m obsessed with this bike, TOO much fun! And literally everywhere I go I get thumbs up, smiles, and people striking up conversations over the bike…It’s crazy.
Check out how clean the tank is! white vinegar and a chain does wonders…
The CB400f is OFFICIALLY FINISHED! I finally got the new tires on and finished tuning this puppy. She screams! I don’t even want to sell it…but that’s part of the job. So here is the finished product:
Wait how’d you get in there Jazz?!?
I was just informed last night that I have to be moved out by July 1st! My land lord’s daughter is coming back to town and moving in therefore I am getting kicked out. So the next while may be a little crazy for me. I’ll be sure to find a place with a nice shop space so that I can keep doing my work and I better find it quick!
I still hope to have at least the CB750 completed before the move. But we’ll see.
Silver lining: Now I can get a dog!