Dear Subhaven, yep to your #48, I was lazy and did not go look.... ops
You did not mention your Run Jets installed. I would guess you need another 147 run jet. I think most of the 258's are going to be in the 147 Run Jet and 35 or 40 Idle Jet range. So.... I would have asked for a 147 run Jet when you were getting jets, you should already have one 147 run jet.
The Write up shows smaller jets for the Idel Circuit and the Run Circuit both. The Idel Circuit supplies about 15% of the run circuit so it does have a affect. I would expect you would need smaller run jets too. I would always start buy looking at the plugs so you can read what the engine is doing at Idel, run town, and run hwy. If you do not look and read the plugs you are guessing. I think my jet selection will be spot on for many of us.
The Idel Mix Screw is a flow control it does not change the Air/Fuel ratio, A/F ratio, of that circuit. There is still a range of operation for this screw setting and is covered in the tune documents. Just like the idel screw there is a range for that also, in not in the range it tells us stuff.
Let us know what range of setting your Idel Screw and Idel Mix Screw and your jet mix along with how your plugs look. Then maybe we can guide you or suggest.
Also anytime we make changes to the carb and jets, need to go back and adjust the time too and then tweek the carb again. If the plugs are fouled they need to be cleaned or replaced, the carbon is conductive and can "foul" you up by allowing your spark to jump to ground and not the spark gap.
Let us know what you found??
When we get this settled, I will lock this thread.
Last edited by Fjguercio; 04-27-2009 at 07:41 PM.