Not Ranked
This won't fix your Demon problem, however I need to insert here that I just had my 750HP re-calibrated by Power System for my create 460 (535HP), and WOW! What a difference! Starts immediately when cold, idles smooth after just 15 to 20 seconds at high idle (no choke, just my foot), & smooth transitions between circuits. It does, however, run-on a tiny bit about 10% of the time when I shut her down, but I attribute this to the poor winter gas - I just make sure she's in gear and ease the clutch out a bit when I shut her down. I don't have enough miles on the "newly calibrated" carb to see the impact on MPG, however I'm able to get into 5th a lot sooner than before, as she now runs smooth 1300, 1400, 1500 RPM.
I know this doesn't help you with your 850 Demon, but I just wanted to point out that maybe a 750 would be better, as I'm really happy with my 750 on my 460.
YMMV,
Randy R...
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