Oil Tanks for Big Twin 1936-1939

The left side lower rear mounting bracket, where chainguard and inner tin primary are attached, is typically rotten on most original Horseshoe oil tanks. These weld-on repair pieces come in handy to restore the bracket to its original state.

Accurate reproductions of the factory filler caps and dip sticks as used for stock Horseshoe style oil tanks.

Banjo bolt; for feed & return oil line; fits Big Twin 1936-1937; steel, CAD (ZnNi process); thread: 1/2”-20; replaces OEM HD 3570-36A; gross weight: 28 g

Banjo bolt by Strange Bird; for Oil tank vent line; fits Big Twin 1936-1937, 45cui/750cc 1937-1973; steel, CAD (ZnNi process); connection thread: 3/8”-24 UNF; replaces OEM HD 63578-36; gross weight: 18 g

Drain valve by stahlbus; fits OEM horseshoe oil tanks 1938→, 45" →1973, FLT 1980-early 1981, XLCH →1973, XLCR 1977, Sportster 1979-1981; steel / aluminum; thread: 5/8”-18; with valve, a copper seal, 40 cm hose, a protective cover, detailed instructions; Germany; NOTE: On 1958-1964 swingarm frames space under the oil tank is limited. Pls check before trying to mount the valve.; gross weight: 140 g

Reproduction of all original screws, nuts and spacers to mount oil tanks of 1936–1964 Big Twin models.

Modern gel or Li-Ion batteries offer a significant advantage - they are leak-proof. Those who ever experienced spilled acid in their horseshoe oil tanks will highly appreciate this fact. On the other hand, owners of classic bikes do like the looks of their original energy store and the corresponding cover and mounts. With a Bates BattBoy Battery Box you can have the best of both worlds, because what looks like a period type HM5 6V accumulator on the outside can house a safe, modern battery within. Just hook it with two eyelet wires to the terminals on the bottom of the lid and you are all set. Perfect for 6 to 12 volts electrical system conversions, too. When using suitable Antigravity versions you even have some storage room left for a few small spare parts, safety vest, Cuban cigars, etc. Ain't this one heck of a cool solution for an old problem?

Reproductions of the 6 V battery top covers as used on 1936-1964 Big Twin models.

Oil change without a mess! This rubberized aluminum alloy sheet allows you to form an individual funnel or trough to direct your waste oil from the hard-to-reach oil tank drain hole or oil filter plate to any suitable container. Of course, you can also use it to fill fresh oil into your tank. Tapered at one end so it can be shaped to reach tight spots. You can reshape and use it a thousand times and on different bikes. With suspension eye so you can hang it up for drip-off. Easy to clean.

Our electric start system just got even more stealthy....

Pre-TwinCam engines have a spring loaded ball check valve to prevent the engine oil from seeping down to the crankcase. These check valves don’t last forever. If you try to start your engine after a lengthy period of inactivity (e.g. winter), the oil in the crank case gets forcefully ejected via the breather. Creating an ungodly mess on your garage floor....

The legendary battery as used by the Motor Company for decades. These accurate reproductions exactly fit into your stock horseshoe oil tanks or battery trays and have the poles in the correct positions.

Custom oil tank filler cap and dipstick with chrome-plated hex head. Fits all stock H-D horseshoe oil tanks or similar aftermarket oil tanks.

Our traditional single grade lubricant for engine and transmission for heavy thermal and shear loads. Complies with H-D recommendations up to 1984 for Big Twins and Sportsters up to 1981. This high performance lubricant complies with API CF.

Custom battery which fits into your stock horseshoe oil tank or 45” battery tray. It is shorter than the original 6 V battery, therefore the use of standard mounting components requires a spacing block or extension.