Hi guys,

Turns out - wholly unsurprisingly - that the North Carolina springtime isn't fun for carburetors, given that the temperature will quite happily change by 30-40F day-to-day. What this seems to have meant most obviously so far is that sometimes I want to roll my idle mix out more than three turns to avoid leanness (obviously I don't, I keep it around 2.75, but it wants more), but later in the same day it needs to roll back a little to not be rich.

This is with the stock pilot jet on my 2012, which I assume is a 52.5.

The question, then, is whether a 55 pilot might be more flexible and allow me to get rich enough on colder days (which it will), but without necessarily running crazy rich when it's 95F outside. This really depends on how much overlap the idle mix screw gives you between jet sizes...

So, before I go and spend a bunch of time messing around with it, does anyone have any insight?

More generally, any word from others who live near here and deal with the same schizophrenic spring/summer as to what setups you use would be greatly appreciated.

Anyone who understands the hows and whys of car b ration well enough to ask that question is able to solve the problem.

Asking questions about which jets to try without details about intake and exhaust makes it tough on the carb guys. They are usually kinda anal about elevation, too. I'd be surprised if Durham is not pretty close to sea level, for jetting purposes. It's Humid, so , were I you, I'd jet for the average temperatures and humidity levels you're gonna get During the time of year you'll be riding. Durham averages humidity above 80, and generally survivable temperatures.

http://www.usclimatedata.com/climate/durham/north-carolina/united-states/usnc...

https://www.currentresults.com/Weather/North-Carolina/humidity-annual.php

Remember to adjust the idle down to adjust the idle air.

Thanks to your comments, I realize I've been silly, of course.

I'd been noticing, as the temperature rose the last few weeks, that the bike had been idling rich, and got less powerful. I'd attributed that to warmer air meaning richer condition, when actually it had been tuned rich all along, but that only becomes apparent when the engine is properly warmed up. My commute is only 2.4 miles, and most of my day-to-day riding is less than 4 miles per trip, so...

Warmer weather = more long rides for fun = more rides where the engine gets properly hot = more often noticing a rich idle.

I guess it can't have warmed up properly last time I spent more than 30 seconds on the circuit. I fiddled with it again right after a long ride, and it was happiest at a little over 2 turns out.

Anyway, thanks for the comments and sorry for what turns out to have been a bit of a time-waster...