no idle 250R
#11
#12
#14
no idle 250R
You said when you put your other carb back on it runs good... That should rule out eletrical problems. When it sputters on the top end that is a sign that it is to rich. Jet down on your main until it revs clean, crisp, and your plug is light brown/tanish. Im going to tell you right now that you probly wont even be close with a 170 main with a stock 85 jug. Start going down not up if it is indeed truly sputtering.
#15
no idle 250R
I have a similar setup, using a mildly ported 85 cylinder and an ESR 38 mm A/S. I have has as large as a 185 jet in it, but it usually runs best with a 168-172 main. The ESR primaries and needles are pretty close for an average trail machine. I never mess with them on my resto-mod cruiser...
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