For engine with shaft kick in 16mm, O ring to use = reference 2335
Version from 2012 with the o-ring that goes around the kick shaft hole
Fit on all 149 and 150 YX if the kick shaft is 16mm diameter (and not 13.3)
There are some others O ring form but all the cover can be use. If necessary you can seal with sealing compound
Provided without the kick seal