TZ350 & TZ250 Close Ratio 6 Speed Gearbox

Nova Yamaha TZ 350 & TZ 250 full six speed close ratio gear set comprises both input and output shafts and all gears, supplied fully assembled ready for installation.

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

All gears are superfinished in house as standard.

Gear ratios have been optimized for racing and are as follows:
1st 19 – 30 1.579:1
} 20.8%
} 13.4%
} 11.2%
} 9.6%
} 6.2%
2nd 20 – 25 1.250:1
3rd 24 – 26 1.083:1
4th 26 – 25 0.962:1
5th 23 – 20 0.870:1
5th 27 – 22 0.815:1
Overall reduction 1st – 6th 48.4%

We also have available a couple of lower 1st gear options as follows:

1st : 19-31 1.632:1
1st : 19-32 1.684:1