2018 Custom Pro-Streetfighter

139 inch primary block
139 inch motor plate
139 inch finished _2
139 inch _4
139 inch _3

What was your intended objective when you started the build?

Lightweight, handling, and power in a build that had attitude while parked.

What motivated you to start your project?

Sketched it on a bar room napkin in a discussion with my son

What was the most unique and creative thing you did to the bike?

Mounted a Twin Cam engine design to an Evolution style transmission with an integral motor plate for stabilization.Built a primary drive block inside the window of a wet primary to route the shift linkage and mount the left foot peg.Built the entire chassis from 6061 T6 aluminum for weight savings.Mounted custom carbon fiber BST wheels.Allowed 60% of the bikes weight distribution to be forward of the wheelbase centerline, and created 3.5 inches of positive trail.

What are you most proud of?

The bike has an appearance of “bad attitude” even while parked

What do other people say about your motorcycle?

They stare at the details in awe.

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Submitted by: David D Jr

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Specifics

Classification: Full-Custom
Make, Model & Year: 2018 Custom Pro-Streetfighter
Fondly known as: Wild Thing
Time spent: 780
Motorcycle cost: N/A
Money spent: $78,000
Engine: Engine was built as a “one off” by George Bryce at Star Racing. It is 139 cubic inches, 12.5:1 compression ratio, 4.800 inch bore by 4.187 inch stroke, 2.450 inch intake valves, 1.900 inch exhaust valves, lobes are .474 inch in & out, 1.625 inch rockers gives .772 inch lift at 280 degrees at .050 intake duration, 295 degrees at .050 exhaust duration, producing 250 crank HP.
Intake: Twin S&S Super D carbs mated to a single throttle shaft to produce simultaneous “butterfly” operation burning fuel in dual plug heads to ensure complete combustion.
Exhaust: Custom built tuned exhaust from 314 stainless steel mated with a Burns collector and free flow muffler.
Transmission: Trans mission is a 6 speed Baker Torquebox with a kill switch for clutchless shifting, mated to a Baker FFP wet primary drive housing a Baker King Kong clutch system.
Frame: Chassis is built entirely from .250 inch 6061 T6 tubing and CNC machined 6062 T6 components. Wheelbase is 70 inches, backbone stretch of 1.50 inches, downtube is 1 inch under stock length, 23 degrees rake, 1.881 inch offset in triple trees, 3.53 inches positive trail, and a 26.75 inch fork overall length.
Suspension: Swingarm is 24 inches in length built in a CNC mill from 6061 T6 aluminum and welded together. RaceTech suspension custom designed for this chassis and weight distribution.
Wheels, tires and brakes: Wheels are BST carbon fiber, 18 inch by 10 inch rear, 18 inch by 3.50 inch front. Tires are a V rated 240mm Pirelli in the rear, and a V rated 120mm Bridgestone in front.
Finish – Paint: Steel fuel tank and rear fender are patina rust finished with a satin clear topcoat. Chassis also has a satin clear topcoat. Rocker box covers, oil reservoir, and other miscellaneous parts are black satin powder coat. Front down tubes are carbon fiber wrapped, triple trees are black annodized along with the transmission and primary drive
Accessories: Barely. A mirror, HID headlight assembly, and a kill tether switch in the event I go to the dragstrip

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