Tuesday, June 16, 2015

1978 HONDA CB750 Custom

1978 HONDA CB750 Custom- Sold Texas

The CB750 was a game changer. Our goals for this one were simple: Maintain some of the original look and feel, see how much weight we could take off this baby without loosing any of the nice 'features', make it go faster, make it stop quicker, and make it look good doing it!

Official weight 422 LBS wet. Thats a 23.4% weight reduction!


Displacement:              736.00 ccm (44.91 cubic inches)
Final drive:                    530 O-ring chain Conversion
Front tire:                     Pirelli Diablo Rosso II 120/70 R17
Rear tire:                      Pirelli Diablo Rosso II 160/60 R17
Front Master Cylinder:   Nissin 19mm radial
Front brakes:                Dual floating disk, 4 piston Nissin Calipers
Rear brakes:                 Single disk, single piston Nissin Caliper
Front Suspension:          Fully adjustable CBR900RR 45mm forks
Rear Suspension:           Dual gas charged reservoir shocks
Ignition:                         Electronic Hall effect ignition system
Gauges:                        Motogadget Mini/ LED oil pressure warning
Wet Weight:                 422 lbs (551.2 lbs Stock)
Tank/ Fuel capacity:      1973 CB750 hand shaped scallops/ 4.25 gallons

Build Specs:

Engine- The engine was low mileage to begin with so we took her apart just to check everything out. A quick freshen up including, lapping the valves, new valve seals, new rings, new seals and gaskets was all that was needed inside. Everything was vapor blasted before painting the cases, polishing the covers and finishing with a brushed effect, and installing new allen head bolts throughout.

Frame- Before being powder coated in gloss black, we removed all unnecessary brackets, tabs, and other bits. We also installed a rear hoop section, new seat mounts, a new electronics tray, relocated the shock mounts, and added mounts for the rear sets

Intake, Exhaust, and Lubrication- We stuck with the original carbs but rebuilt and rejetted them after vapor blasting to accommodate the new 4 into 1 exhaust and K&N air filters. We did away with the old oil tank and fabbed up a new low profile one that acts as the rear fender and opens up the middle of the bike a bit. We also made new oil lines to send and receive the lube. We saved the plans for the oil tank if you would like to order one, available in aluminum.

Suspension- We mounted up front forks and triple from a CBR900RR Fireblade and installed dual gas charged shocks in the rear. The forks are preload, damping, and compression adjustable while the shocks are adjustable using a spanner and gas. With the new shock mounts and forks, the bike now has killer stance. We also fabbed up a new fork brace that holds the removable front fender.

Lighting, Controls, and Gauges- Up front we have a new headlight with built in turn signals that sits on custom aluminum brackets. We mounted the Motogadget speedo in the headlight bucket to reduce clutter. Mounted into the top clamp we now have a LED oil pressure light (we figured if you cant find neutral or remember to turn off your signals then whats the use). We used the same clip-ons from the Fireblade and put in a new set of control switches for a CB750K0. A new set of grips, custom made cables, and bar end sliders complete the cockpit. The rear sets are also from the Fireblade and are mounted up to the frame via new frame mounts. In back we have an integrated LED tail/ brake/ and turn signal set up. Powering everything is a super light Shorai battery. We installed a new reg/rec unit, new starter solenoid, flasher relay for the LEDs, electronic ignition, and reworked the wiring harness. We knew that removing the starter motor would be an easy way to reduce weight, but its nice to have the finer things in life, so we decided to keep it.

Body, Tank, and Seat- We started with a tank from an earlier CB and hand shaped the scallops. We put a new thumb lever cap on and a new petcock. The seat is a handmade fiberglass unit that follows the basic shape of the rear of the tank. We had the guys coat them with Speed Green before adding the swooping lines that you may recognize from a CB350. The seat pan was upholstered here in Santa Fe by B&M upholstery and paint was shot by Munoz Customs. The headlight bucket, exhaust, and front fender all have the same textured black finish. We saved the seat mold if anyone wants to order one.

Brakes, Wheels, Tires- There are now dual floating discs up front and a single  disk in the rear. Dual four piston Nissin calipers handle the duty's in front pumped by a 19mm Nissin radial master cylinder, and a single piston Nissin in the back. Custom brake lines are S/S braided. The bike is running on Pirelli Diablo Rosso II tires front and rear riding on 17 inch Honda wheels that were coated in gloss black. An added benefit of using the newer wheels is that they have the 'cush drive' which reduces stress on your transmission. We also did a 530 chain conversion, which uses the stock Fireblade sprocket sizes and reduces weight.

Included with the bike: Manuals for Motogadget gauge, Nissin master cylinder, and Shorai Battery. Set of plugs, tool kit, extra key, jetting for your location, and detailed maintenance instructions.

1 comment:

Unknown said...

was the front fork a direct bolt on are did you swap the stem and bearings.

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