Why do "Chinesium" chainsaws need a richer oil mix?

[GeneralKayoss]

A proper chain pulls itself away from the bar and feeds into the wood on its own. A dull chain heats up the bar from prying on the dogs. Not to mention the 3–4 times longer it takes to cut the log without giving the saw a break to cool down. That added heat from the bar and slipping the clutch transfers into the case

100% correct. You're bogging the saw therefore the saw can't extract the heat as well, combined with the extra heat from the added bar friction. When I'm milling and really pushing the saw I can feel the exhaust get hotter. Let off a bit and let the revs climb for just a few seconds and I can feel it running cooler.

 

[RedneckChainsawRepair]

I run 40:1 VPracing oil and Efree gas from pump in everything. OEM clone dont matter never a issue.

 

[Marley5]

The recommended rich mix on these clones are too cover the lowest common denominator.
I have a friend who straight gasses everything......it won't help him.

 

[Hermio]

Like was said before. Richer oil mix is better for the saw. 50:1 is only to satisfy environmental concerns

Not necessarily. As long as all parts are coated with an oil film, more oil will not improve lubrication. What it will do is clog up the spark arrestor with carbon and gunk. I don't know what the minimum ratio is for a given saw or oil, but I don't think it would help the saw with today's oils to go back to 16:1 or even 8:1. I use Amsoil Saber at 50:1 with no problems in my 500i. Probably, 70:1 would be OK, but the oil is cheaper than saw repairs.

 

[Chucksta]

A proper chain pulls itself away from the bar and feeds into the wood on its own. A dull chain heats up the bar from prying on the dogs. Not to mention the 3–4 times longer it takes to cut the log without giving the saw a break to cool down. That added heat from the bar and slipping the clutch transfers into the case

Astute observation! Never would have thought that that much heat would be transferred. I always figured that spitting dust, would land up coating the fins and air intake grill. Hence, the reason to blow out the saw with compressed air after use.