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Post By turboguzzi
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17 Sep 2021
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Veteran HUBBer
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Join Date: Oct 2016
Location: Dusheti, Georgia
Posts: 196
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Fuel crystallization?
Hello everyone.
maybe asking something very basic, but somehow this thing gets important first time during 6 years of riding this bike ('02 xt600e).
(this color might be skipped by more experienced people).
few days ago in some mountains engine suddenly become very weird at some throttle openings - maybe from 1/4 to 1/2: unstable revs, much more shaky, backfires... obviously accompanied with negative emotions and crazy fuel consumption.
actually for the first time it happened right after ~3 mins of rather continuous engine braking around 2500m of altitude, when descending on sharp downhills.
tried to still continue riding. few minutes and somehow everything is normal again.
working title of this thing was "altitude sickness" by that time.
it was long ride to home and during it this syndrome used to appear and disappear randomly, and the range of unstability also changed randomly: sometimes from 0-1/4, sometimes 1/2-3/4.
starting was not always easy.
highest revs seemed generally better.
after normal conditions, cold/higher places used to trigger this syndrome to appear again.
couple roadside draining of carbs did little to no help.
finally got home and removed carbs.
was surprised with this white somehow solid, but very flimsy and dry thing, looking like thin film of fine crystals stuck together, habitating mostly in primary carb and not only. a bit in secondary. around fuel cap center. at the endings of draining pipes etc.
all jets / needles, float, fuel container, pipes etc. were clean at the moment of disassembly.
despite of always getting fuel at trusted network of fuel stations, only guess for now still is a bad fuel.
well, obvious questions are what the #### is this thing and how to avoid it happening again.
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