Charon
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I'll be interested to know what you find when you take your carburetor apart. I'm curious to know what would allow your motorcycle to run at speed for ten miles and then cause grief.
Last year I took a little trip on my '07 S40. On one leg I drove at 70-75 on the Interstate, and got about 39 mpg. Most of the time I run it at 60-65, and get mileage in the low to mid-50s. On one trip I drove around the Rocky Mountain Park and environs, at their low speed limits (45 max, some slower) and got 70+ mpg. Of late I have been running around 55-60 and getting mileage in the high 50s.
Except for removing the idle screw cover and adjusting the idle mix, my S40 is box stock. Contrary to Skrapiron's experience, my bike runs just fine, and I get only occasional backfires on deceleration. I tried the "white spacer mod", though I didn't take it to completion. I removed the spacer and installed 2 4-40 washers (the spacer is about 3 washers thick), and fuel mileage dropped immediately from low to mid 50s into the high 40s. I could discern no difference in performance, and the backfire didn't go away. I replaced the white spacer and my mileage went back up.
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