Oil ratio

[Deacon]

I'm running a new to me 225 pro-max with the oiler still opperable. Wanting to run 40:1 mix. How much do I add per gal. to attain 40:1...Thanks. Fishing boat. 19'3 Gambler.

[baddjonny]

can't really say the output from the oil pump is varyable depending on speed my guess would be aprox. 1-2 oz per gallon on top of what the oil pump puts out if you troll alot less , hi speed go higher.

my 2 cents
jon b

[HStream1]

I'm running a new to me 225 pro-max with the oiler still opperable. Wanting to run 40:1 mix. How much do I add per gal. to attain 40:1...Thanks. Fishing boat. 19'3 Gambler.

40:1 ratio is 19.2 oz to 6 gallons. But as already stated the oiler varries depending on throttle position. If I remember correctly the oiler system idles at 100:1 and maxes out at 50:1.
So a pre mix added to a oiler system would have the ratio all over the map.

IMO I'd either stick with the stock set up for a fishing motor or get rid of the oiler system all together.

[ChrisCarsonMarine]

In my many years in the outboard business the biggest reSon folks are reluctant to remove automatic oilers and pre-mix has been the lack of confidence as to the ability to mix accurately.I applaud your decision to run 40:1 in your motor,but it can't be done with the help of the self-oiler.Also,even if you add a little oil to your fuel to complement the mixer,it won't be enough to keep you from sustaining damage when the mixer quits.Spend an hour and a few dollars and install the factory made block-off and dispense with 50 percent of the reasons we need to rebuild motors like yours,Chris

[catfish123]

The math is for 50:1 ratio.............128/50= 2.56 ounces per gallon. 40:1 ratio is 128/40 = 3.2 ounce per gallon

3.2 - 2.56 = .64 ounce/gallon more is neede to make it 40:1

I have been adding .5 ounce per gallon now to my 225X in order to put it close to 40:1 ratio for a long time with no ill effect. I did this for a little extra insurance because I had the limiter raised a bit. Although my mix is not exactly 40:1, it is close. It's about 42:1.

[Deacon]

Thanks for all the in-put guys. I guess I'll be taking the oiler off soon. Rex

[HStream1]

The math is for 50:1 ratio.............128/50= 2.56 ounces per gallon. 40:1 ratio is 128/40 = 3.2 ounce per gallon

3.2 - 2.56 = .64 ounce/gallon more is neede to make it 40:1

I have been adding .5 ounce per gallon now to my 225X in order to put it close to 40:1 ratio for a long time with no ill effect. I did this for a little extra insurance because I had the limiter raised a bit. Although my mix is not exactly 40:1, it is close. It's about 42:1.

While I agree with your math ratios. I totally agree with Chris on this one. You can never be at or close to 40:1 with an oiler system and pre mix combined. Again your ratio will be all over the map. The oiler system is not constant it varries from Idle to WOT.

If I'm wrong, I as always will stand corrected but I don't think so in this case.

If the oiler system operates at various ratios based on throttle position. How can you be at 40:!/42:1 constantly??

[Dave Strong]

If you get rid of the oil inj, would think 50:1 mix would be fine unless revlimiter is removed an are running over 6500rpm.

Dave

[Jay Smith]

I remove the VRO on EVERY 225/200 Pro Max I build ( except the X motor ) 3 got canned just this week..

Jay

[1BadAction]

To answer the question: Note the linkage arm position at WOT, remove the link between it and the throttle arm, fix the arm on the oiler so it doesn't move, and boom, straight ratio automatic oiling. Its not rocket science.

That said I would take it off, throw it in the garbage and install a blockoff plate.

[h2oskiier30]

That said I would take it off, throw it in the garbage and install a blockoff plate.

Then, spend $4-5 on an oil-to-gas ratio bottle with all the different ratios printed out on the side, and voila!!!...Correct oil ratio becomes idiot proof.

[1BadAction]

Then, spend $4-5 on an oil-to-gas ratio bottle with all the different ratios printed out on the side, and voila!!!...Correct oil ratio becomes idiot proof.

yep. I just don't understand what the fascination with automatic oiling is.

[Mark75H]

Yamaha started putting reliable oil injection on 2 stroke motorcycles in 1964.

[Jay Smith]

To bad Mercury didn't !

Jay

[Riverman]

Then, spend $4-5 on an oil-to-gas ratio bottle with all the different ratios printed out on the side, and voila!!!...Correct oil ratio becomes idiot proof.

Or use the metric system of measurement and it becomes idiot proof as well.