The Junk Man's Adventures

The F9 Project

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Vintage Motocross performance project

Watch in playlist OR check out the video pages below for more pictures

F9 Perfomance project episode list

Click the links for the video pages with more pictures and information

THE F9 PROJECT episode 1 Evaluation and focusing of the project

THE F9 PROJECT episode 2 Disassembling and inspecting the various parts

THE F9 PROJECT episode 3 Engine modifications and other performance improvements

THE F9 PROJECT episode 4 Pre-assembly and first start up

THE F9 PROJECT episode 5 The finished project bike and recap (with Pictures!)

Links to the specifications and information used to modify the engine on the Kawasaki F9 Big Horn

KAWASAKI F5 (Bighorn) Speed Kit manual (some information used for this bike)

F9 (BigHorn) speed secrets (text and magazine scans)

KAWASAKI 238 F21M "Green Streak" a bike that inspired this build
(Cycle January 1969 magazine scans)


KAWASAKI F81M 250CC a bike that inspired this build (magazine scans)

Vintage Skunk Works performance parts (intake pipe, suspension)

Boge Mulholland shock specs and rebuild information (shocks rebuilt and used on this bike)

Bassani expansion chamber (information about the exhaust used on this bike)

Got a Kawasaki F11 250cc Endurto?  Here is some performance modifications for that bike

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Rockymountainatvmc.com - Dirt bike & ATV parts
Kawasaki speed kit
The other bike with some rare period performance parts
Picture
Mid-way through teardown
Picture
Kawasaki F9 green streak
This is what we are working towards
Kawasaki f9 big horn
Here is what I started with
Picture
Just a reminder of what we started with
cylinder measurment
Measuring the cylinders
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Welcome to The F9 Project!  In Barn Fresh season 2 the video series delves into a Kawasaki F9 (350cc) Big Horn and turns it into an F81M and F21M "Green Streak" inspired race bike. This series will focus on performance and handling rather than a full on restoration.  The whole idea behind this build is to re-create what an typical rider, that could not afford and exotic European race bike, might do in 1972 to improve or turn his Big Horn into more of a race ready bike for TT or scrambles rather than a lackadaisical enduro that the factory bike is.  The focus is not to make the ultimate Big Horn, but to make an improved version using period correct parts just as someone on a limited budget might do.  Within the videos and video pages there is information, specifications and pictures to help show the scope of this project.  Of course there are many ways to modify any particular bike, this series will show what I chose to modify and change on this bike.  You won't want to miss this!  The video above will give a broad overview of the entire series.  (Pages/Links will become active when episodes are released)  Also check out the links to pages with information I used in modifying my F9 Big horn. Be sure to check out all my other videos!  Leave a comment below or on any of the video pages to ask a question!
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Service Manuals
Mulholland Shocks
Speed Kit Manual
Kawasaki F8 F9 F81M prototype 1971
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  • Home
  • How To Videos
  • Barn Fresh restoration
  • Toy Restorations
  • About the Junkman
  • The Junk Man's Blog
  • Service manuals
    • Impac Industries
  • JMG Behind the scenes
  • Media apperances
  • Current Sponsors