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HMB Shifter Ratchet for 750cc/45cui

HMB Shifter Ratchet for 750cc/45cui

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.

  • fits 45”/750cc 1937-1973
  • steel, zinc plated
  • Germany
Item №
Version
net price*
unit
Availability in warehouse Germany
HMB Shifter Ratchet for 750cc/45cui
74-078
for 3-speed transmissions
$325.29
kit
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HMB Shifter Ratchet for 750cc/45cui
74-079
for 4-speed transmissions; NOTE: Not suited for 3-speed with reverse transmissions.
$352.40
kit
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* The price includes German VAT (19% or reduced rate of 7% for Books).

See also:

4-speed Transmission 45”/750cc

4-speed Transmission 45”/750cc

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
more …
4-Speed Conversion Kit 45”/750cc

4-Speed Conversion Kit 45”/750cc

A 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. With the installation of this 4-speed conversion kit one can achieve a big improvement here because its extra gear 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 benefit from these features.
The conversion kit includes all gears and the shifter drum to transform an old 45” gear box into a 4-speed transmission. All other stock 3-speed parts, like shafts, shifter forks, etc. can be retained or must be purchsed separately if not present. The original primary drive with clutch and the chain sprocket with cover fit without problems. After installation the 4-speed tranny will look 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. The stock side cover has to be machined for clearance. As an option a pre-machined version is also available.
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
more …