new stihl BG 86 owner here

[dlundblad]

Originally Posted by ragtoplvr
NO alcohol premium runs about 2 to 3% richer than 10% ethanol. That is enough that you have significantly less cold start warm up and issues. As well as longer fuel line and carb diaphragm life.

Rod


Stihl also sells Stihl branded E0 91 octane fuel in a tin container.

Might be 93 come to think it it. Can't remember.

 

[Cujet]

I have 2 of them along with an Echo 210 (which is only 21cc and has less power) . I use VP fuels C-9 mixed at 32 to 1 in all. It did take a while for the blower to break in and make max power.

Removal of the exhaust nozzle (it unscrews) did nothing to improve the power. I'd guess a non restrictive muffler would help. But it's not a huge engine and you are not going to get 50cc power out of a 27cc engine.

It is good to remember that small engine displacement is the driving factor behind it's HP.