BUILDING A BETTER BANSHEE
FROM THE BOTTOM UP
Our project Banshee’s riding days
came to a sudden end years ago when
it was run hard in the dunes without
proper carburetor jetting. When excess
combustion heat caused the pistons to
fail, debris from the melting pistons took
out the crank, completely wasting the
engine. Rebuilding a stock crank can
be costly, so we ordered a complete
long-rod stroker crankshaft assembly
from Hot Rods. The crank can
boost displacement up to 403cc.
Vertex 66mm pistons gave us
397cc. The stroker crank comes
fully assembled and trued with
new bearings and rods and
requires special pistons and
a special gasket kit or head
machining for proper piston
dome-to-cylinder head clearance. Phathead Racing modified our cylinder head domes
to accept the special pistons. A
Vitos jet kit provided jetting to keep
the engine running crisp without worries of lean jetting making it crispy.
While the engine was being rebuilt,
we saw the stock reeds were looking
rough, so we replaced them with Moto
Tassinari V-Force high-performance
reed assemblies. A new Uni Filter
FMF Fatty pipes and Powercore 2 silencers
make the Banshee pull and sound like the
screamer it was designed to be.
A Hot Rods long-rod crank increases the Yamaha twin’s displacement to 397cc with the stock bore.
The stroker crank boosts the Banshee’s thin low-end power.
replaced the aged stock part. FMF,
one of the best sources for high-performance exhausts, still sells the
famous “Fatty” expansion chambers
and Powercore 2 silencers we loved so