[AZRickD]

Howdy,

As you know, I bought John Goss's EC250. He had forgotten which jets he had in there so tonite I took it apart.

With the aid of my magnifying glass it looks like I have the following:

MJ = 178
PJ = 45
Needle = "DD" (I saw no other etchings)
Clip on 2nd from top (leaner)

His carb has both the Power Now and Power Now inserts.
He said it had an LTR jet kit.
Stock reeds, I believe.
LTR Powervalve cover.

As jetted, the bike has been running great from February to including now, so I have a good baseline. I'm pretty impressed that I don't need more than a half turn or less of the airscrew to get it to peak performance during these warming months.

With May brings 100F temps so I will find myself driving to Flagstaff and Utah this summer (Elev = 7,000 and 20-30F cooler), so I want to ballpark some likely jetting choices as I do plug chops.

Near the outskirts of Phoenix, the elevation is usually 2,000 to 3,000 feet where we ride. Temps in Phoenix in the wintertime can be as cold as 30F and as warm as 60F. Temps in May reach 90-100F with morning (when we ride) at around 60F. We're approaching the time when some desert dawgs go north or don't ride much.

So, using the Carb Correction Guide in the on-line manual:

I'm already at a correction factor of .99, so I'll just ad .01 to each elevation/temp combination on the chart.

If I use a temp of 104F at 1,500, I get a factor of 4% (MJ175 x .96) = 171 and PJ45 x.96) = 43 for hot riding around Phx.

At Flagstaff at 7K' and 80F, MJ175 x .93 = 163 and PJ45 x .93 = 42

If I wanted to get an extra set of richer jets for cooler temps around Phoenix in the wintertime (say, 50F and 2K'), I'd need a factor of 1.02 or
MJ175 x 1.02 = 181.5 and PJ45 x 1.02 = 46

Or maybe I'd just drop the clip one richer and open the airscrew.

So, how's my GG math?

Thanks,

Rick