Join Date: Mar 2011
Thanked 24 Times in 23 Posts
AFR Regular 87 pump gas w/or without 10% ethanol content:
Idle around 12.8 - 13.4 O2
Mid Throttle 12.3 - 12.8 O2
WOT 12.3 - 12.8 O2
I was told plug reading is not real true with today's fuels, but after I installed new piston rings, my plug readings vs. AFR readings are pretty damn on the mark.
When I had worn rings, no oil smoke out exhaust, engine consumed oil, and compression was good, you would think the plugs were always rich and sooty looking, but the AFR readings were spot on.
05 Brute 750i Stock engine/Muzzy Pro exhaust,Vision Bruiser 14" wheels, 26" Kenda Bear Claw HTR, 3" intake snorkel w/ restriction,2" CVT snorkels,automotive 10" fan,ASR a-arm bushings,sway bar removed,buss connector mod,rejetted at #40 pilots,2 3/4 out on A/F screws,stock needles shimmed .030",# 160/# 160 main jets Keihin