help no manual/jetting
Posted May 11, 2002 - 11:40 PM
Posted May 12, 2002 - 12:19 AM
Great to see another aussie use this site. Nobody I know in Newcastle use's this site.
I'm no jetting expert but I reckon your pilot jet is too big.
I'm useing a 35 pilot & a 55 paj. It is now very crisp off the bottom.
Posted May 12, 2002 - 09:25 PM
The beauty of a flat spot that low is that you can use the fuel screw to experiment with. It is a flat blade screw deeply recessed in the bottom front of the carb, essentially straight up from the bottom in front of the bowl. In for less gas, out for more gas. When you find which way helps, search for more on the fuel screw for whether or not you need a different pilot.
At 1/8th throttle, the needle is just coming into play. There are suggestions (mainly the xxDMM needle) for replacement needles. If you take your jets out and see what they really are (instead of what the last owner said they are), I'll plug your jetting and jetting with a DMM into JD's spreadsheet and let you know what the DMM would do to the 1/8 throttle position.
p.s., its at a basic level so don't read it if you're past that, but the 'Jetting 101' post on the YZ/WR250F forum may help get started with the carb.
pps., The manual for these bikes is awesome. Get the real manual instead of Clymer. Money very well spent.
Posted May 12, 2002 - 10:48 AM
#42 pilot jet
#75 pilot air jet
1 1/2 turns out on fuel screw
clip position #4 (4th from top= middle)
#165 main jet
#200 main air jet
#65 starter jet (choke jet)
Try turning out the fuel screw to 2-3 turns to help the 1/8 throttle.
A bigger pilot jet(#45) or smaller pilot air jet(#60?) will help get the fuel screw closer to 1 1/2 turns.
Posted May 14, 2002 - 11:33 PM