qwhat Rylan had to say
The problem is time and money. We've done some testing, yes. But after you run a couple of stock bikes with different combinations and one is running at 15.0 A/F and another at 14.8 and a third at 14.9 you kind of get the idea and start recommending fuel controllers. That and a person needs to get back onto paying jobs rather than playing around.
I can tell you that a stock bike cruises between 14.7 and 15.1 A/F with the 02's plugged in. Unplug the 02's and it cruises between 14.3.- 14.4ish area. Smack the throttle to get into the open loop and the high throttle positions are about 12.5ish.
So what I always tell people is unplugging the 02 will help richen it up a bit, but it will still be running really lean. A mistake that some make it running it at 100% throttle on the dyno - noting the 12.5 A/F ratio and then going to the forums telling everyone that their bike is running super rich. Yes, they run rich at 100% throttle because thats how the bike is designed. At cruise (5-20% throttle) that same bike may be at 14.9.
So back to OP's typical scenario: Yes, the bike will run just fine with a set of pipes with the 02's connected or disconnected. SUPER FRIKKIN LEAN, but yes. So then OP may get on the forums and say "well my bike without a controller runs FINE!" Well actually it runs o.k. now, but two things to think about:
1) How much better would it run with better fueling? A LOT actually. More throttle response, cooler motor, less popping, less engine damage, etc
2) What are the long-term issue with running so lean? I have opened up motors with 20-30K miles on them running like this and the exhaust valves look like craters on the moon. The motor really does take a beating when you run it super lean for a long time.
So again, motor runs really lean with both the 02's connected or disconnected - slightly richer when disconnected. Combination makes no difference really, it's just splitting hairs to compare. Get a fuel controller and richen up the cruise and lean out the Wide Open Throttle.
The Vic Shop, Inc
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