Running 40:1 in a 50:1 world.

[Fordiesel69]

One thing worth mentioning is strato port cylinder designs. If you are operating a standard 2 cycle engine, the entire fuel / oil mix hits the crankcase first, then up the transfer ports. When manufactures switched to strato port design, 20% less of fuel / oil mix gets into the crankcase. While this improves emissions, makes the exhaust cleaner, and lowers combustion temps to a small degree, why are we seeing crankshaft bearing failures? Partly is the 50:1 not providing enough lubrication for the bottom end components. Add in crank stuffers on the 550XP / 562XP chainsaws for example, even less oil is getting the the crank bearings and seals. This will speed up the failure.

40:1 really is the win. Plenty of protection, and no real trade off in anything negative. Anything equipment that is sentimental or not easy to obtain a replacement, 32:1 and you will need to tune the carb for it.

 

[Japanese]

Everthing I own runs on 40:1 and have been for over a decade. I used to mix my dirtbikes 32:1 and they loved it as long as you were on the throttle. Seemed to make more power.

32:1 is a universal ratio for dirt bikes, especially the air cooled ones. Usually water cooled and engines that use turbine cooling run 40:1 and 50:1.

 

[rainman49]

E0 with Red Armor mixed 45:1 for the win! That's what I use in my Echo, Husqvarna and Stihl saws and 4-Mix FS131R and Kawasaki trimmers.

 

[andyd]

I mix a qt at a time. It is used on a newish Mantis tiller and a Husqavarna weedwacker and my lawnboy F series push mower. I have a graduated syringe. My mantra is : buy cheap oil, but use a lot of it. I'm using up the odds and end of whatever mix oil I come across in one of the sheds. the OPE speccing internal combustion are gonna be replaced by electrics except the mowers and blower. I have Lawnboy Fseries engines, etc to keep the 7073 going longer than I'm bound to last.

 

[Silverado12]

I use Amsoil Saber at around 50:1-60:1. It's heavy viscosity 2 stroke oil and I've used it with good results for the past almost 30 years.

 

[jake wells]

Trufuel is the worst. I would probably run e10 at 40:1.

Trufuel is awful

 

[jake wells]

Why is it the worst? What are you basing this on?

70 percent of equipment coming into my work where the equipment either runs poorly or wont run at all.
Dumping it out and and adding 89 e10 mixed at 50:1 solves the issue

 

[Fordiesel69]

Trufuel is the one that seems to age out in the can. Best to use VP or Echo Red Armour fuel.

 

[oil pan 4]

70 percent of equipment coming into my work where the equipment either runs poorly or wont run at all.
Dumping it out and and adding 89 e10 mixed at 50:1 solves the issue

Same here. I see mostly lawnmowers.

 

[Fordiesel69]

E10 fuel in high use equipment like landscapers and tree companies likely is a non issue. Its too fresh to damage the fuel system. In homeowner equipment regardless of equipment grade, E10 will usually take on water (hygroscopic) and corrode the fuel system.