Yammy 3 cylinder 2 stroke (fumey)

[SWFISHER]

Yamaha 3 cylinder 2 stroke running on 50: 1 oil mixture but is a little fumey. Yes it is a 2 stroke I know but the fumes upon starting is possibly not so good. Can the mixture screw be adjusted to help with eliminating some of the smokeness?

[swof63]

You haven’t said what hp motor or whether it is pre-mix or self oiling.

I always thought Yamaha pre-mix motors ran at 100:1 maybe check your manual.


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[SWFISHER]

Ok sorry it’s a 40hp pre mix. 2006 model.

[robothefisho]

3 cylinder 40 will be 50-1. Use genuine Yamaha oil if not doing so already.

[SWFISHER]

Ok I’ll give it a go

[BigE]

Yep
brother's 50 hp 3 potter the same thing , changed to yammie oil and it cleared up after about 6 trips. not sure why but i think the yammie oil and the merc premium oil seem to smoke less and idle smoother

BigE

[SWFISHER]

Thanks guys I’ll change the oil. See how that goes.

[ericcs]

if it's idling fine, don't adjust the mixture screws. that will only it make idle rough, or not at all!

[gazza2006au]

I was once recommended to use Evinrude XD-100 i think it was don't hold it to me, for pre mix but it is pricey i personally use Valvoline i found it to have less smoke than Castrol

for some reason i love smelling 2 stroke motor bikes but 2 stroke outboards just make u choke and feel sick