|01-14-2010, 10:32 AM||#1|
Strugglin' to be Average!
Joined: Apr 2005
Location: The Rox, Colorado
Colorado Jetting Questions for a Beta Rev3
I just picked up a 2006 Beta Rev3 270 and I had a question about jetting here in Colorado. Most riding will be in Denver and up.
I did the carb float mod that has been talked about. It has a 150 main and 30 pilot which is stock.
I talked to C&G who import the Beta's and they said to go with a 140 main, 25 pilot, and the needle in the middle (Stock). Does this sound right? I've jetted 2-strokes before but this is my first Trials experience and I don't want to mess it up. Wouldn't the needle need to be leaned out a little too?
They also recommended 70:1 with 91 octane and a good Synthetic 2-Stroke Oil.
Thanks in advance!
Fay Myers Motorcycle World
Full Factory Offroad LLC
2012 KTM 450SX-F Dungey Factory Edition
2008 KTM 690 SM-R
|01-15-2010, 08:01 PM||#2|
Joined: Oct 2007
I had a betarev 2006 for three years. They come with jets too rich, especially the idle. It tends to give a fuel too rich, even at sea level, and therefore clog the middle exhaust, which causes a gradual loss of power. I can not tell you what jets to put in your situation, but it's worth doing this work by trial and error, by checking the color of the spark plug. To the mixture, I rolled up to 90:1 without problem. "Hiking" is safer at 70:1.
|01-16-2010, 09:26 PM||#3|
Joined: Mar 2005
Location: In your front yard under suspicion
I'd say C&G's recommendation is as good a place to start as any. I've been running a 140 main with the needle in the middle also and ride mostly around 6000'. My bike seems especially finicky with respect to the pilot - I've run everything from 25 to 35 and have yet to find that 'magic' size. I had a 32.5 in today and it felt rich no matter what I did with the air screw, yet that same jet felt perfect a couple of weeks ago under mostly similar temp and altitude conditions. The times I've gone down to 25 it felt too lean, but every bike seems a little different so you might as well try it. At the very least, you'll get good at pulling the carb
If at first you don't succeed, lower your expectations
A foolish consistency is the hobgoblin of little minds - RWE 1841
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