Routy
Serious Thumper
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SuzukiSavage.com Rocks!
Posts: 2280
Winston Oregon
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If an engine is not running correctly,...w/ regards to lean and rich, it is not getting the best mpg. You cannot improve mpg by starving an engine for fuel....to the point of it surging or running rough.
On the other hand, if an engine is running correctly......defined as smoothly in all ranges, I believe it is getting about as good mpg as is possible, nor is there any noticeable performance gain to be had by modding the carb. I just don't know why anyone would do the white spacer mod (same as raising the metering rod) if the engine is running smoothly in the low and midrange throttle.
I did the spacer mod because I had a surging at slow speed in the lower gears. Had this been years ago I would have raised the metering rod by moving a clip to the next slot. Trimming the white spacer did the same thing, and it corrected the low speed surging almost perfectly. I also now need less choke for a shorter time in cold weather. I did not notice any difference in fuel miliage, probably because its not using much fuel in the low speed range anyway. My bike always did run good at hi and WOT range, and the one time plug check showed a nice tan white color. If however, I ever did a major open exhaust mod, and/or like to run a heavy throttle in hot weather, then and only then would I be modding main jet,....depending on other things like altitude. Yep, I have always gotten near 50 mpg, but most my riding is in very hilly country. I also believe the large differences in mpg on this site, is the rider, not the motorcycle.
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