Originally Posted by clicheche
also, do i have to disconnect the chain in order to loosen the crankshaft?
or just loosen the crankshaft?
1980 yamaha enduro 175cc
huh? loosen the crankshaft? i'm assuming this is a typo/misspoke/etc...
you mean countershaft seal? remove rear wheel, move chain off front sprocket. bend lock tab on frt sprocket. remove nut. remove sprocket. remove/replace seal. you may want to bend locktab and loosen frt sprocket nut before you remove wheel/chain so you have something to hold the frt sprocket from spinning..
there is a bushing the countershaft seal rides on. you may want to replace, or at least flip it around if the seal has worn a big groove in it.