What fuel should I use in 4 stroke yamaha
Submitted by Bedgy13 on Mon, 2022-02-07 08:27
Hey all, I've recently bought a boat and it has a 60hp 4 stroke yamaha on it, the guy I bought it off said he had been using 98 unleaded in it, I've read that they are designed to use 91 unleaded, my question is do I continue using the 98 or just use 91?
sunshine
Posts: 2554
Date Joined: 03/03/09
I use 91
And get a nautical mile to the litre with my 225. 98 totally unnecessary
VIC DORY
Posts: 308
Date Joined: 28/05/15
1nm per L with a 225 is
1nm per L with a 225 is insane economy
sunshine
Posts: 2554
Date Joined: 03/03/09
Been like that since new.
6.8 Seaquest......regularly head out from Woodies to the 50's for a round trip distance of between 48 and 50nm for a fuel use of perhaps a litre more than distance travelled .....I try and sit on 3200 revs or around 23 knots. Economy drops if I wind it right up....increases to around 1.2 litres per nm but why hurry when you don't need to
Bedgy13
Posts: 3
Date Joined: 10/05/20
Thanks
Thanks for your reply, I'm guessing changing to 91 won't do any harm after using the 98
Ian2
Posts: 4
Date Joined: 24/12/15
fuel
I have a 65lt in floor tank and was advised to use 98 as 91 dies quicker you never use 65lt in a trip and you are just topping up fuel so to keep your fuel fresh I use 98. The cost is not that much and my fuel is good to go.
little johnny
Posts: 5329
Date Joined: 04/12/11
Supposed to use 91
Every now and again I run 95 to blow it out
VIC DORY
Posts: 308
Date Joined: 28/05/15
I'm usually the same but
I'm usually the same but with the price of 95 lately it makes me lean towards 91 especially if I have to fill the prado (150L) up at the same time.
Faulkner Family
Posts: 17862
Date Joined: 11/03/08
Only ever used 91 . Never
Only ever used 91 . Never had any problems at all. 50nm on 70 litres in a 140 Johnson running at around the 4500 rpm
RUSS and SANDY. A family that fishes together stays together
straith
Posts: 396
Date Joined: 25/11/13
+1 91 is fine
but as previously mentioned chuck a load of 98 in occasionally
Jackfrost80
Posts: 8048
Date Joined: 07/05/12
Interesting comments. What is
Interesting comments. What is the benefit of chucking in a load of 95 or 98 every so often?
Officially off the Pies bandwagon
Faulkner Family
Posts: 17862
Date Joined: 11/03/08
From what I have been told
From what I have been told it supposedly cleans out the injectors. Never tried it myself
RUSS and SANDY. A family that fishes together stays together
paulbazza
Posts: 153
Date Joined: 24/11/10
yep 91
i bought a brand new 90HP yamaha 4 stroke a few months ago.
Was told by chivers marine to use 91.
Still monitoring my fuel economy , but i am using at least 50% less than my old 70HP 2 stroke :) getting around 1.3 NM per litre.