crf

comprimento rosca + colar - 11 mm
diâmetro rosca - 6 mm
diâmetro colar - 7,76 mm
comprimento colar - 2,2 mm

https://www.partzilla.com/product/honda/90380-KZZ-900

https://www.crfsonly.com/howto/crf250x/crf-valve-adjustment/crf250x-val…

https://www.rickramsey.net/CRF250Lmods.htm