Velocette 6 Speed Gearbox

Road & Race

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The Nova 6 speed gearset is designed to fit the standard Velocette type 10, 12, and 14 gear box shells.  Primarily conceived for racing use, though many of these gearsets have found homes in road going machines.  Especially in the higher reving 350 Viper, or those who use their machines for touring or riding two up. Please note that 5th and 6th gears are not overdrives.

All gears have 3 undercut engagement dogs with optimised backlash for fast changes and positive retention.  The gearset comes with both the mainshaft and layshaft fully assembled (excluding main bearings), three selector forks, a 5 speed cam plate, and actuating pawl.  The kit is also supplied with a sprocket of the customers choice in either 428 or 530 pitch.  See sprocket options at the bottom of the page.  Wear in an old front cover circlip groove can allow the mainshaft to move so as an additional safety measure an accurately machined collar is also supplied that prevents the circlip from jumping out.

The road version is supplied with a kickstart 1st layshaft gear which operates with the standard kickstart mechanism.

The race version comes with a plain 1st layshaft gear which cannot be used with the kickstart mechanism.  Therefore the race kit is supplied with a billet aluminium bearing carrier which replaces the standard kick start boss.

Part of the charm of these machines is that we have yet to see two Velocette cases exactly the same! Sleeve gear threads can sometimes differ as there are many pattern parts on offer. A compatible sleeve gear nut can be purchased at additional cost.

 

Available With Superfinish

 

The ratios for both road & race versions are as follows:

 

Gear                                                      % drop
1st   27  -  21   = 2.250:1
                                                )           22.2%
2nd  24  -  24   = 1.750:1
                                               )           17.4%
3rd   19  -  23   = 1.446:1
                                               )           14.9%
4th   19  -  27   = 1.231:1
                                               )           10.5%
5th   17  -  27   = 1.102:1
                                               )             9.3%
6th                   = 1.000:1            

            

Drive Ratio 16  -  28         1.750:1

 

Overall Reduction 1st – 6th              55.5%

 

A taller 1st gear pair is also available, which is 8.1% taller than the 1st ratio supplied as standard. 

Alternate taller 1st ratio

1st   22  -  26   = 2.068:1

 

The following sprockets are available for the 5 speed gearbox:

Z17   530

Z18   530 & 428

Z19   530 & 428

Z20   530 & 428

Z21   530 & 428

Z22   530

Z23   530

 

These gearsets are available exclusively from http://www.velocettegearset.com

 

	Nova Velocette 6 Speed Race Version