Yamaha DT100 Fork Seals

Fork specs for the Yamaha DT100 vary by year (see the table below).Every kit here is verified by the manufacturer to fit this exact bike. Fork seals can share a size and still not seat in a different fork, so we only list what is confirmed for your bike.

  • Fork typeConventional
YearsFork tube
1974–1976 30 mm
1977–1983 27 mm
KitYearsSeal sizeReplaces OEM
55-101 1977–1983 27x39x10.5 n/a
55-102 1974–1976 30x40.5x10.5 n/a
57-123 1974–1976 n/a n/a
56-105 1974–1976 n/a n/a

Verified fork kits we stock for your Yamaha DT100

Fork oil for your Yamaha DT100

A fork-oil change on the Yamaha DT100 uses 10wt fork oil. Factory fill: SAE10W (KYB G10 / equiv).