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Mikuni HSR 42, 45, and 48 Carburetor
Kits for Harley Davidson
HSR Carbs can
be purchased individually or as
'Easy' kits, 'Total'
kits, or 'Race' kits.
Mikuni has followed up on its successful
HS40 Carburetor with the advanced technology second generation performance
carburetor called the HSR42. The designation HSR42 denotes a smoothbore
racing carburetor with a 42mm venturi for Harley-Davidson applications.
The
HSR42 and its big brother the HSR45 were designed with a larger body
assembly to fill the need for bigger throttle bores in all-out performance
applications. Mikuni designed the new HSR42 carburetor with a smooth
pulling 8-roller bearing flat throttle slide assembly. The flat throttle
slide design allows an unobstructed venturi at full throttle to flow more
air, and it carburates more precisely at all throttle settings.
Most aftermarket carburetors use
butterfly throttle valves which obstruct the carburetor’s venturi at all
throttle openings, creating airflow turbulence and hindering precise
air/fuel metering. Mikuni’s roller bearing throttle slide offers smoother
control and allows the use of a lighter throttle return spring for reduced
throttle effort. Flow bench tests show that the new Mikuni HSR42 and HSR45
are able to flow more air to the engine once installed on the manifold and
head than other models of aftermarket big-bore carburetors. This is
because other big venturi carburetors have that restrictive butterfly
throttle valve which disrupts and hinders air flow. The HSR42 actually
flows more air at full throttle to produce more peak power than other
bigger carburetors. While at smaller throttle openings the Mikuni’s
smaller, yet higher velocity flowing venturi, together with its advance
fuel metering system provides a stronger overall power bank with improved
ridability.
The HSR42 is also the largest
performance carburetor on the market to meet the requirements of the
California Air Resources Board for installation on 1340cc Evo model
Harley-Davidsons. Other performance features include a larger capacity
float bowl and a higher flowing needle valve assembly to accommodate
extended full throttle operation. The Mikuni adjustable accelerator pump
provides instant throttle response throughout the RPM range. Mikuni
HSR42/45s are available in complete bolt-on kits for most Harley-Davidson
models.
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HSR Carbs can
be purchased individually or as
'Easy' kits, 'Total'
kits, or 'Race' kits. |
Application Guide for 'EASY' Kits:
Keep your stock look with Mikuni's uniquely designed Easy Kit. Continue
to
use your stock manifold, choke cable, and black plastic air box or the
Screamin' Eagle performance filter. Each kit includes the Mikuni HSR42
carburetor, air box adaptor, and instructions. It is common to realize a
25%
horsepower increase using this kit!
Note: Other applications may be
available, please
email us for
information. |
