Better mileage after stator replacment ?? Actually display changed to Imp Gal from US - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 16 Old 02-09-2017, 01:42 AM Thread Starter
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Better mileage after stator replacment ?? Actually display changed to Imp Gal from US

I've been hesitant to post this while I think about this more, and call me crazy but I've been 2 1/2 tanks of gas since I got the stator replaced in my '12 650A, and all other things being equal*, I'm getting at least 8 maybe 10 mpg better. not a fluctuation within the error bars.

enough experience should be out there among everyone who got stators replaced with the recall or otherwise by now, so (a) can anyone give me anecdotal support and (b) is there a logical reason for this?

*Not all things are completely equal, since the oil and filter were changed (and the oil was a little overfilled), but otherwise it's a standard freeway commute every day, I know what the bike does after > 45,000 miles. Same gas, etc. since the replacement. But I wouldn't have expected anything through the alternator system to directly affect engine performance in a noticeable way... I'm stumped.
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post #2 of 16 Old 02-09-2017, 01:57 AM
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I'm yet to do a lengthy ride after the stator replacement, however from the riding i have done it's about the same as before at abot 4.5l per 100km

Current: 2014 DL650A
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post #3 of 16 Old 02-09-2017, 02:30 AM
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The stator could cause extra load on the engine if something is wrong and casing the stator to be near full load of a failing stator not of a good one. It is not very likely but could have an effect.
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post #4 of 16 Old 02-09-2017, 11:34 AM Thread Starter
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Quote:
Originally Posted by Clayyalc View Post
The stator could cause extra load on the engine if something is wrong and casing the stator to be near full load of a failing stator not of a good one. It is not very likely but could have an effect.
I'm dubious. The stator that was replaced in the recall showed no signs of the overheating problems that could lead to the heat shielding getting melted through and then the shorting... but aside from that defectiveness that did cause some stators to fail (not mine), maybe the new stator is of a more efficient/lower thermal load design that just makes the engine run better... not complaining but I dunno.
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post #5 of 16 Old 02-09-2017, 11:50 AM
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I see no way for stator replacement alone to improve mileage unless the old one was actually shorting somewhere. There is not enough room among the 18 poles for larger wire to be used and get the same output, so efficiency cannot be much different.

However, switching to a series regulator can reduce wasted power by 60+ Watts. I saw a couple MPG improvement in gas mileage when I replaced the stock, shunt R/R and installed LED headlights.
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post #6 of 16 Old 02-09-2017, 12:29 PM
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Better power delivery makes for a stronger spark which could burn fuel mo bettah making better MPG?
Nah, it's just PFM.
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post #7 of 16 Old 02-09-2017, 12:42 PM
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Originally Posted by Trepidator View Post
I see no way for stator replacement alone to improve mileage unless the old one was actually shorting somewhere. There is not enough room among the 18 poles for larger wire to be used and get the same output, so efficiency cannot be much different.
I haven't been following the stator recall posts too closely (doesn't apply to my bike) but I'm guessing Suzuki found some kind manufacturing flaw with either the insulation coatings, how it was applied or how the windings were terminated, i.e. something not to spec, that was causing early failures. (Early is relative to the known failure rate for pre-2012 (?) bikes which they did not recall and Suzuki deems "normal"). The stator vendor is probably on the hook for much of the costs of the recall (or, ultimately, their insurance company).

Quote:
However, switching to a series regulator can reduce wasted power by 60+ Watts. I saw a couple MPG improvement in gas mileage when I replaced the stock, shunt R/R and installed LED headlights.
I have been reading a lot of past posts on stators and mosfet R/R since I am upgrading my system. I recall that a number of riders reported a small increase in MPG even with the mosfet upgrade even though it is a still a shunt type.

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post #8 of 16 Old 02-13-2017, 10:44 AM Thread Starter
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OK I'm an idiot. Once the MPG started getting into the mid-60's I knew something was off, not that I take the absolute values as truth but the relative change was suspicious... then noticed that the air thermometer was reading in C instead of F. Dealer mechanic must've monkeyed around the instrument panel looking for something or my settings my have reset after the stator change, but anyway in the fine print on the panel I saw the MPG was reading in imperial gallons. Hmph. Back to normal.
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post #9 of 16 Old 02-13-2017, 10:55 AM
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Don't you hate it when that happens?
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post #10 of 16 Old 02-13-2017, 11:20 AM Thread Starter
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Don't you hate it when that happens?
Damned imperialists.
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