petrol oil mix

freddie · 19-10-2009, 07:43 PM

Anybody know the petrol oil mix on a 75 hp 1985 merc.

driver510 · 19-10-2009, 08:07 PM

yes that will be 50/1

freddie · 19-10-2009, 08:32 PM

Thanks driver 510

rob m · 19-10-2009, 09:12 PM

what about a merc 2.4 i have been doing it at 100/1

driver510 · 19-10-2009, 09:23 PM

i think 40/1 will be ok. at 100/1 i would think it will blow up soon

Burty · 19-10-2009, 11:03 PM

Quote:

Originally Posted by rob m

what about a merc 2.4 i have been doing it at 100/1

i really hope you are crap at maths

PerformanceDodge · 19-10-2009, 11:56 PM

Thats interesting, when I spoke to E P Barrus in the summer regarding my 1984 Mariner 150 they told me 100:1 for leisure use and 50:1 for commercial use. 50:1 seemed to smoke a bit and seemed to oil the plugs when manoeuvring under 1500rpm for extended periods. 100:1 sounded very lean mix and a little extra oil can hurt so I settled for a compromise of 75:1, seemed to run fine.

driver510 · 20-10-2009, 08:20 AM

thats what you would run if you raced it