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Supermono

April 2008

 

We are continuing to develop a range of transmission parts for the 4 stroke motorcross engines being converted for use in supermono racing.  Close ratio road race style 5 speed gear clusters have been produced for the CRF450 and YZF450 engines.  Higher ratio primary gears for the CRF engine are now available. 

A 6 speed gearbox for the CRF450 has successfully completed its first meeting, being placed 6th and 4th in the British Supermono Championship rounds at the Snetterton race track on 11th and 12th April. 

Honda CB450

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6 speed gear set

Full Six Speed Close Ratio Gear Set comprising both input and output shafts and all gears , 3 selector forks, selector drum, indexing block and neutral indexing roller.  Supplied fully assembled ready for installation.

All engagement dogs are undercut and have three dogs to promote positive  and rapid engagement.

We have dispensed with the standard circlip retaining the Clutch Centre and manufactured the input shaft with a screw thread.  The gearboxes are supplied with the necessary washer and lock nut together  with the Clutch Pressure Plate pusher.  The only modification required to fit this gearbox using the standard wet clutch is to provide sufficient clearance in the centre of the Clutch Hub for a socket spanner to fit the nut.

Should you  in future decide to fit the Dry Clutch this arrangement will be already in place and not involve any more additional expense.

Ratios are as follows:

lst     15 - 29 teeth   1.933:1
                                                ) 25%
2nd  18 -  27 teeth       1.5:1
                                                ) 18.9%
3rd   13 - 28 teeth   1.217:1
                                                ) 14.7%
4th   26 -  27 teeth   1.038:1
                                                ) 10.8%
5th   27 - 25 teeth    0.926:1
                                                )  7.1%
6th   31 - 27 teeth      0.86:1


overall reduction 1st to 6th  55.5%

Price  £1300 + vat & carriage

Dry clutch with oil pump

Combines an efficient oil pump with a dry clutch. The rotary oil pump is driven by a gear behind the crankshaft primary gear which gives a superior flow rate to that of the original plunger pump.

The Dry Clutch has fibre coated friction plates and steel drivingplates. The Primary Gear and Clutch Drum are supported on needle roller and ballrace bearings for a low friction drive. The Clutch cover being an aluminium casting, anodised to give the appearance of electron.

Price £975 + vat & carriage

Honda CB450 Dry Clutch Components

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Nova Racing Transmissions Ltd  8 Horseshoe Yard  Crowland  PE6 0BJ  UK
Tel: 01733 210082  Email: info@novaracing.com