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Old 03-22-2013, 03:59 PM   #102
ebrabaek OP
Beastly Adventurer
Joined: Jan 2010
Location: Grand Valley, Colorado
Oddometer: 4,873
Originally Posted by Gaspare View Post
@ ebrabaek: regarding the extra-lean at low rpm, fighting with a TM Mikuni for an XR650, I've heard something about a physiological behaviour.... pls look here @ 6th paragraph:
Yeppers.....As of to not to confuse too many people, I did not mention that we saw the lean condition as a read out from the AT O2 sensor on runs 3 and 4. The tail pipe sniffer is as you correctly pointed out not as accurate as the inline O2 sensor, but it was very , borderline dangerous lean when just running around on the dyno. By that I mean pretending you are riding normally.....except you are on a dyno..... Inside the regime that the stock map is NOT using the O2 sensor. I really dig the flat A/F line as the end result yielded..... Great article by the way.

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