Honda CB72 & Honda CB77 5 Speed Race Gearbox

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This is our version of the original Honda Kit Gearbox, but it is not in any way interchangeable with Honda parts.

As most of the engines used today are 350cc, the opportunity was taken to increase the width of the gears from 8mm to 12mm by deleting the kick start mechanism.

The set comprises mainshaft with all gears, circlips, spacers, etc., sleeve gear with needle roller bearings, layshaft which is supported at each end by needle rollers and the loose gears to complete the set.   A new selector drum is included together with a revised selector mechanism which is similar to that used on the later K4 engines and is designed to give more precise selection of the gears.  This is attached to the existing gear change shaft by a locating pin and welding by the customer, (see picture below). This modification can be carried out by Nova for UK customers at an extra cost.

To complete the installation an additional selector fork is required.  It is also necessary to modify all three forks, full details of the simple modification required are supplied with each gearbox.  Modifications to UK customer selector forks can be carried out by Nova, if required.

 

WE CAN ALSO SUPPLY THE GEARBOX WITH 3 SELECTOR FORKS AND A CHOICE OF TWO SELECTOR DRUMS TO GIVE EITHER SHIFT PATTERN. ALSO A COMPLETE SHIFT ARM AND LEVER ASSEMBLEY TO AVOID ANY FORK OR SHIFT ARM MODIFICATIONS.  THIS COSTS £1675.00 + VAT (IF APPLICABLE) & CARRIAGE.

 

Click here for fitting guide

 

Available With Superfinish

 

Comparison to Standard Honda CB72 & CB77 Gear Ratios

Nova Race Gearset                          %  Drop            Honda Standard  Box            

 

1st      19 - 31   x   LDR    1.903:1                               1st          3.120:1  
                                                             )   25.3%                                                  )         44.2%
2nd     23 - 28   x   LDR     1.4201                              2nd          1.740:1 
                                                             )   14.7%                                                  )         27.0%
3rd      26 - 27   x   LDR    1.212:1                               3rd          1.270:1 
                                                             )   10.8%                                                  )         21.3%
4th      27 - 25   x   LDR    1.081:1                                4th          1.000:1   
                                                             )     7.5%                                                                

5th      28 - 24   x   LDR    1.000:1                                                     

                 

Overall Reduction 1st – 5th                 47.5%       Overall Reduction 1st – 4th    70.0 %

 

To find out about availability or to order this product or for further information please click here

 

Price £1425 + VAT (if applicable) & Carriage

 

	Nova Honda CB72 & CB77 5 Speed Race Gearbox

	Nova Honda CB72 & CB77 Selector Arm Welded To Standard Honda Shift Spindle