Pratt Engineering
about > who makes this stuff

WHY THIS EXISTS

Started because I got tired of watching old bikes sit in garages waiting for parts that don't exist anymore. I have a mechanical engineering background and got into vintage bikes. Turned out the CAD and modeling skills translate pretty well to reproducing obsolete plastic parts. Now I scan, model, and print parts for bikes from the 60s-80s that would otherwise be parts bikes.

My garage currently has a '65 Honda CA95 Benly, a '75 XL175, a '78 XL350, an '81 Express SR, and a Yanmar YM186 tractor. All bought cheap because they were missing something that hadn't been made in 30+ years.

'65 CA95
'65 CA95
'75 XL175
'75 XL175
'78 XL350
'78 XL350
'81 Express SR
'81 Express SR
Yanmar
Yanmar
YM186
YM186

BACKGROUND

MS MECHANICAL ENGINEERING

My master's thesis was on computational fluid dynamics. Specifically modeling how particles move through turbulent air in human lungs. Sounds unrelated to motorcycle parts, but the skills transfer: 3D modeling, computational analysis, working backwards from geometry to design.

CFD simulation
» read the thesis

I also code physics simulations:

Coding a Cloth Simulator from Scratch
Building a Particle Simulator From Scratch (2D + 3D)

NOT JUST CAD

I also weld, wire, and build things:

DIY Solar Generator / Power Station
Welding Table Build || First Welding Project

KEEPING OLD HONDAS RUNNING

Half of fixing old bikes is diagnosing electrical problems. Made some videos on testing the common failure points:

How to Test Condensers/Capacitors for Ignition Coils
How to Test an Ignition Coil
How to Test a Regulator/Rectifier

Questions? Email jacob.pratt01@outlook.com