Honda CRF450 Close Ratio 5 Speed Gearbox

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This gearset is a direct replacement to the Honda CRF 450 5 speed motocross gearbox with the added advantage of undercut engagement dogs and road racing ratios.

 

The Nova close ratio gearbox gives a performance gain of up to 1.5 seconds a lap depending on the length of the circuit.  The gear ratios are optimized for road racing to keep the engine working between its peak torque and peak power.  The ratios of the standard box are designed to give tractability off-road, and as such cause the engine revs to drop below peak torque meaning drive from the engine is not optimized.  Over the length of a 3.9km circuit, lap time improved by 1.5 seconds.

 

This kit includes only the loose gears. 

 

NOTE: The gearbox should be assembled using the standard shafts, bearings, bushes, thrust washers etc.

 

CLICK HERE FOR CRF450 PRIMARY DRIVE

 

Available With Superfinish

 

Click here for an explaination about gear ratios

 

Gear Ratios

Nova Race Gearset                 % Drop            Honda Moto X Box

1st     15 - 26      1.733:1  
                                               )     22.0%                        18.3%
2nd    17 - 23      1.353:1 
                                               )     16.5%                        16.0%
3rd     23 - 26      1.130:1 
                                               )     11.5%                        15.0%
4th     23 - 23      1.000:1   
                                               )        8.3%                        13.4%
5th     24 - 22      0.917:1  
 

Overall Reduction                     47.1%           Overall 49.5%

 

AN ALTERNATE 1ST GEAR RATIO IS AVAILABLE AT 15 - 28 (1.867:1) TO GIVE A 1ST-2ND PERCENTAGE DROP OF 27.5% AND AN OVERALL OF 50.9%

 

Price £975 + VAT (if applicable) & Carriage

 

	Nova Honda CRF450 Close Ratio 5 Speed Road Race Gearset

CLICK HERE FOR HONDA CRF450 BILLET ENGINE CASES DESIGNED TO FIT IN HONDA RS125 CHASSIS.