KTM 790/890 Close Ratio Gearbox

This will be a direct replacement. It will include a new input shaft and the loose gears.

All the gears incorporate undercut engagement dogs with optimised backlash for rapid changes and positive retention when engaged. It is to be assembled using the standard output shaft, bearings, bushes, thrust washers and circlips.

Z18 front sprockets are also available now.

Input Teeth Output Teeth Ratio % Drop
1st Gear 13 37 2.846
2nd Gear 17 34 2.000 29.73%
3rd Gear 20 31 1.550 22.50%
4th Gear 22 28 1.273 17.89%
5th Gear 24 26 1.083 14.88%
6th Gear 23 22 0.957 11.71%
          Total % Drop 1st-6th 66.39%

Input Teeth Output Teeth Ratio % Drop
1st Gear 15 32 2.133
2nd Gear 19 31 1.632 23.52%
3rd Gear 20 27 1.350 17.26%
4th Gear 23 27 1.174 13.04%
5th Gear 24 25 1.042 11.27%
6th Gear 23 22 0.957 8.17%
          Total % Drop 1st-6th 55.16%

KTM 790/890 Close Ratio Gearbox

Price £2000

+VAT (if applicable) & Carriage.

Nova assembly: 09305-000