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AFR Info

posplayr said:
One final update on jetting. After ridding without the LM-2 AFR installed I started to get some low RPM sogginess. I assumed it was the needle so I dropped it all the way to the bottom groove. That was a mistake The plugs came out black after a few minutes of low throttle cruz'n.


I ordered 45 pilot jets, to replace the 47.5 Bill had installed for when I originally had the 4:1's installed. The new pilots had the holes while the old ones did not :confused:. Anyway went back to the original #2 grove position with the 45's and the bottom end is now very sweet and I got an inadvertent power rollown 2nd gear wheelie so it seems to be running crisp. :p


Final settings then:

Mains = 135 (down from 145)
Grooved DJ needle = 2nd grove from the bottom (down from 3 1/2)
Pilot jet = 45 (down from 47.5)
Mixture screws were set for max RPM = close to 2 turns (was 1.5)
Float height 22mm (unchanged)

I'm assuming that the fatter needle and smaller Main are to compensate for the 4:2:1 v.s. 4:1 flow characteristics. Dyno Time?


Just a note, After changing the pilots and checking the float heights , I reinstalled the carbs and the bike stumbled at idle and ran higher idle. I assumed it was the pilot change. After digging out the Balance gauges and calibrating them I realized that the chock cable was not seated and it was partially pulling causing one set of carbs to be more open that the others (Duh).

Anyway basically the pilots did not affect any of the carb throttle balance settings
Click to expand...
Good info here, thank you.
Do you know what size pilot air jet you are running?
 
All I can say is WOW! Thank you for all of that info! It's VERY helpful and informative! Lots of work.
 
Sorry if I missed this information (haven't read the thread carefully), but...

Can somebody point me to instructions for installing an AFR meter on a bike?
Can the probe go down in the collector?
Can a "temporary" installation be done instead of having to weld on a bung?
Has anybody tried one of the inexpensive AFR meters? (some on ebay are about $25, plus another $15 for a "universal" 4 wire probe)
 
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