Admittedly the investment for a set of stroker flywheels is pretty hefty and you wouldn´t crown this wonderful device with a set of inferior pistons, would you? The Wrecking Crew, for one, didn´t want to gamble and had these special pistons made by the renowend German manufacturer Graf. Those guys supply the vintage and classic racing scene since decades and you can simply trust their material. And yes, they are more expensive than your average 45 piston but a seized or broken piston at full throttle is by far more costly, guaranteed.
These special Graf pistons are made for small twin Flatheads with 4.5” stroker flywheels. They are shorter than stock pistons so the engine case baffle plates do not need to be removed. Complete with piston rings, pins and locks.

This shifter mechanism basically works like a Ratchet Top of Big-Twin models: after each shifting operation all involved levers return to their home position and are ready for the next gear change. Thus it is possible to convert your trusty 45 cui. hand shifter Flathead to foot shift or to a Jockey shifter. Available for stock 3-speed or Custom 4-speed transmissions. Besides the ratchet each kit comes with a bag of small parts which contains a ball joint, clevises and various mounting parts. Not included are shifter rods and shift levers.

For WR factory racers the MoCo made a special "Light Frame" with numerous lightening holes on forged parts and various brackets omitted to save weight. On the other hand two rear frame braces were added to increase stability and two tabs to accept the spiral springs for a small racing seat. Unlike the original counterpart this reproduction is built from sturdy steel and not from chrome-moly tubing, which was prone to break. Now you can build your authentic race bike with peace of mind. Dimensions and details exactly follow the factory counterpart.

Hand clutch cable, which was used in addition to the foot clutch on WLA/C military models and Servi-cars. Comes complete with frame bracket, adjuster, and fittings. Of course, Custom applications on civilian W series models are possible, too.

Authentic reproductions of the original WR gas tanks as used on the 1946-1952 production race bikes of the same name. The narrow shape and omission of the speedo assembly achieve that much sought after racy look.

Hotter cams are a must for more power and speed, because the stock cam profile and timing does not allow enough gas flow. These reproduction WLDR cams are exact copies of the factory parts which provide an increase in horsepower, especially in the mid and high rpm range. With good bushings in gear case and cover installation is a simple, straightforward procedure.

Fully assembled, ready-to-install, 4-speed (!) transmissions for 1941-up 45 cui./750 cc Sidevalve Harleys.
It is a fact that while the engines seem to last forever, those worn, clunky transmissions can be a continuous source for trouble. Full restorations - and that’s exactly what is often required - are expensive and tasks for the real experienced only, so it is definitely worthwhile to consider a complete replacement. Especially when this replacement is not just a well functioning duplicate of the same old thing but a large improvement, too.
A real drawback with original 3-speed transmissions is the large gear ratio difference between 1st and 2nd, i.e. from 2.47 to 1.57:1 with a consequent big rpm drop. If you ever rode 2-up in the mountains you will know how annoying this can be. The 4-speed version with its extra gear is a vast improvement here because it allows you to stay in the power band much better for an overall riding performance unknown before. Additionally, all gears are machined from modern materials for higher strength and feature an updated tooth-design for smoother and quieter running. Solo machines, sidecar rigs and Servi-Cars - all likewise benfit from these features.
The 4-speed transmission comes completely assembled with all gears, shafts and covers installed for a quick, straightforward installation. It accepts your original primary drive with clutch and the chain sprocket with cover. It looks exactly the same as its 3-speed counterpart so nobody can tell the difference from its outer appearance. The only extra part required is a 4-speed shifter gate.
Stock 3-speed gear ratios:
1st - 2.47:1
2nd - 1.57:1
3rd- 1:1
4-speed gear ratios:
1st - 2.67:1
2nd - 2.03:1
3rd - 1.42:1
4th - 1:1