whataboutbob

Oh, I did not realize that - thanks for the needed information. Perhaps the big bear manual would be of benefit to me.

Thanks for the suggestions and offer guys but sadly it is not a Big Bear. I know the pdf manual exists - just will continue to look for it online.

Thanks for the reply - already checked that before making my post and did not see the manual I needed.

Would anyone have a working link for the service manual for a 1989 Yamaha YFM350ER Moto 4? Thanks for everyone's time.

Thanks to everyone who weighed in on this issue - I will pass on everyone's ideas/suggestions to my father.

My father just drained the oil for his 1989 Yamaha Moto-4 350cc ATV and was curious if it would be safe to replace it with synthetic oil. Any help would be appreciated.