Cala’s High Performance

Reproduction of the cast iron manifold for WLDR/WR Class C race bikes as well as for K and KR models.

Thermal insulator block for Linkert M-series 3-bolt carburetors and Schebler DLX that mounts between the carburetor and the manifold. Included are 2 O-rings, as well as a spacer that fills the recess on stock manifolds and eliminates the cavities between the manifold and the insulator block.

Cala's version of the thermal insulator first used on Panheads. Instead of being used between two gaskets it features a double o-ring seal thus providing a superior seal between manifold and carburetor. Fits any Linkert 4 bolt application.

This kit comprises two levers, a ball end rod and springs to connect two Linkert carburetors in dual carb set-ups. Designed for pull-action throttle grips or spirals.

On Harley-Davidson Flathead engines, such as the UL and WL models, the engine can overheat under heavy load because the flow rate and pressure of the original oil pump are limited. The CHP high-performance oil pump solves this problem: it retains the classic stock pump design but works internally with modern gerotor technology, significantly improving the efficiency of the lubrication system. Typical oil pressure on a hot engine: approx. 30 psi (instead of 5 psi with the stock pump), Flow rate: approx. 1 liter in 45 seconds (instead of 7–10 minutes with the original pump), The result is a cooler, smoother-running engine that is reliably lubricated even with performance upgrades. Installation is simple, identical to the original pump, so no additional modifications are required.

The CHP return pump is the ideal complement to the CHP high-performance oil pump, designed to balance its increased flow rate. With wider gears, the return capacity is increased by about 40%, ensuring more efficient oil circulation within the engine. The pump is fully compatible with original Harley-Davidson feed pumps and can therefore also be used in stock configurations. Installation is identical to the original pump, with no additional modifications required. The Big Twin version features a 10° angled fitting, allowing the oil line to route neatly past the frame — especially useful in tight installation spaces.

With the CHP pump installed oil feed volume is substantialy increased and the stock scavenger system might reach its limit. This conversion kit for the scavenger pump raises volume by about 40% for a more effective oil return. It includes all necessary longer small parts.

For performance engines. These special relief valve springs are a tad stiffer than the standard springs in CHP Flathead oil feed pumps and will raise oil pressure by 5 psi.

Gasket by Cala’s High Performance; for Gear cover; fits Sidevalve Big Twin 1937-1948; paper; 0.30 mm thick; replaces OEM HD 25227-37; gross weight: 100.2 g