Xpit Formula Four
This is Xpit chassis 406, CASC chassis 3-323. It
was originally registered to Doug Weaver and then passed through
several hands, eventually ending up on the west coast, where I
acquired it in 2009. It was originally powered by a CB750, then
later a GSXR-750, and was at some point returned to CB750 form. I
have been racing it since 2010 in the BC vintage series in its
original, non-wing CB750 configuration.
The car is currently located in Surrey, BC, just
While essentially stock in configuration, the
CB750 engine has numerous upgrades that improve reliability and, to
a lesser extent, performance.
Forged Carrillo connecting rods
Reinforced rocker cover (rocker tower braces) as used on factory
Honda race engines
Modified float bowl sumps (for operation under lateral G)
In addition, the deal includes the following
components that could be assembled into a much more powerful (but
still F-Four legal) engine.
Hilborn mechanical fuel injection system (with
836 cc kit (larger-bore cylinder barrel and matching pistons)
Ported cylinder head with enlarged valves
Because of the large number of CB750s made, engine
and transmission components are readily available from Honda dealers
or online sources such as Bike Bandit and Vintage CB750. That's
handy if you plan to keep the car in vintage form.
A large number of spares and related components
Front and rear wings (not currently being used,
but fully functional)
Side radiator pods
Rear lower A-arms
Many Honda components (cylinder heads, starter motors, clutch
components, transmission bearings, etc.)
Drive sprockets of various sizes
A second set of rims, with rain tires mounted
In addition, critical chassis dimensions and most
custom components have been modeled in 3D CAD, facilitating their
re-fabrication should that be required. CAD files are included as
part of the deal, if you desire them (SolidWorks 2010 format).