What oil in yamaha 80 4 stroke 4 wheeler ???

[DUECE'SDAD]

Changin the oil in a 4 stroke 4 wheeler for a lady here at the shop but all the motorcycle shops are closed on monday what weight do i refill with ??? Thanks in advance

[Trailer Park Casanova]

Dance with who brung ya.
20 w 40 non friction modified motorcycle oil.
10 w 40 if ya can't find the above.

[DUECE'SDAD]

Cool, i just put Ams oil synthetic 20 w 50 for harley engine/primary/trans that should suit it just fine, i needed the weight !!!

[SmokinLowriderSS]

Grew up running 10W40 in every bike I owned/rode, from age 7 on, 50cc Honda, 70CC Honda, 80cc Suzuki 2-stroke, 80cc Honda, 185cc Honda 3-wheel, V-45 Sabre, 750R4 Ninja, CB750-Four Honda. All 4-strokes unless marked.