Mikuni

Required when installing smooth-bore Mikuni carburetors HS 40 & HSR 42/45 on models with crankcase breathers that vent through the heads. Works with HSR 42/45 on Big Twin, Sportster and Buell models.

Since the seventies Mikuni round slide carbs were and still are installed on Harleys. They are robust, easy to adjust and fuel economical. This 34 mm version is specifically sized for 45 cui./750cc W and G (Servicar) models, where they replace that old Linkert and yield smooth idle, easy starting and crisp acceleration.

These 40 mm flat throttle slide carburetors are made by Mikuni and especially designed for Shovelhead and Evolution engines. The advantages of the popular ”HS40” carburetor are its easy installation, improved starting, more torque throughout the RPM range and fully adjustable accelerator pump.

The improved versions of the ”HS40” flat slide carburetor. Features include a high-flowing 42 mm or 45 mm bore venturi which results in a significantly increased air flow, making this carburetor ideal for modified, high performance engines. However, the 45 mm version is recommended only for very big engines (98 cui +) or pure race applications. A two-piece throttle slide that rolls on stainless roller bearings and a lighter throttle return spring provide positive and comfortable throttle control. Additional advantages are an adjustable low speed air screw, an enlarged needle valve and float bowl, improved starting, more torque throughout the RPM-range and a fully adjustable accelerator pump. Each kit comes complete with instructions for easy installation.

The improved versions of the ”HS40” flat slide carburetor. Features include a high-flowing 42 mm or 45 mm bore venturi which results in a significantly increased air flow, making this carburetor ideal for modified, high performance engines. However, the 45 mm version is recommended only for very big engines (98 cui +) or pure race applications. A two-piece throttle slide that rolls on stainless roller bearings and a lighter throttle return spring provide positive and comfortable throttle control. Additional advantages are an adjustable low speed air screw, an enlarged needle valve and float bowl, improved starting, more torque throughout the RPM-range and a fully adjustable accelerator pump. Each kit comes complete with instructions for easy installation.

The carburetors only. For Custom Bike projects. Designed to fit stock CV manifolds and air cleaners but accept various aftermarket air cleaners, too.

Complete selection of individual replacement parts for Mikuni cran case breathers.

O-Ring by Mikuni; for Idle air adjuster screw; Mikuni HSR 42 and 45 carburetor; rubber; ID x OD: 3 x 5 mm, 1 mm thick ; gross weight: 1 g

O-Ring by Mikuni; for Float valve; Mikuni HS 40 carburetor; rubber; Ø 10.5 mm; ID x OD: 7.5 x 10.5 mm, 1.5 mm thick; inner Ø: 7.5 mm; gross weight: 1 g

O-Ring by Mikuni; for Float valve; Mikuni HSR 42 and 45 carburetor; rubber; ID x OD: 8.5 x 11.5 mm, 1.5 mm thick; gross weight: 1 g

O-Ring by Mikuni; for Breather bolt / Banjo / Cylinder head; Mikuni HS 40 carburetor; rubber; ID x OD: 8.5 x 12.5 mm, 2.0 mm thick ; gross weight: 10 g

O-Ring by Mikuni; for Drain plug / Float bowl; Mikuni HS 40 carburetors, Mikuni HSR 42 and 45 carburetors; rubber; ID x OD: 19.5 x 22.5 mm, 1.5 mm thick ; gross weight: 8 g