So I recently bought a brand new stihl ms261 cm and had it ported by a reputable porter on this site. The saw runs awesome with tons of power and torque but I think I’m running to rich. I’ve run about 5 tanks through it and I’m still getting black oil out the exhaust. I’m running 90 octane ethanol free with yamalube r2 at 32:1 ratio. Is that to rich should I be looking at maybe switching to 40:1. I just ordered a quart of motul 800 2t off road 2 cycle oil. I was going to mix up a batch with that but wanted your guys input to what ratio