If you order from Sudco be sure you may want to order needles and jets on both sides of these because shipping is like $7 on one jet or lots of jets. Getting a range is actually cheaper and it gives you room to experiment.
I am running a 178 main and I am at about 450 feet here in Dallas and we generally run humidities in the 55~65 percent range and temps in the 80's to low triple digits.
The manual says my idle jet is a 45 and my needle is a R1468D, but they say I should be running a 185 main right now because of temps.
I dropped from a 185 to my current 178 when I went to Moab this spring and found a very different (and more powerful bike) between my legs when I lit it up the first time. I decided not to change it when I got back and it is a lot stronger here as well.
I run 32:1 (instead of 40:1 or 60:1) as recommended.
Tony is probably correct for the R1468D needle. I'm not familuar with that needle so I don't know.
The straight taper DDK, CEK etc need a slightly richer main jet. Therefore the 182. If I were using the stock needle for my EXC (which I don't remember the actual number ) I would also be using around a 178.
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