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Old 12-31-2009, 09:20 PM   #16
concours
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It's rule number 1 for

sleds. Squeeze the throttle and verify a proper return. The frost (NOT carburetor icing) forms after a warm shut down in the slide area of the card. The resistance you felt was the slide jamming into that frost... just be glad it was a weenie assed scooter and not a 175 horsepower sled.
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Old 01-01-2010, 10:05 PM   #17
rufus
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When you open the throttle there is an air pressure drop in the intake. Water vapor freezes at a lower temp when the pressure is lower. This frozen vapor ( looks like a slushee) blocks the slide. The more you open and close the throttle, the more likely you are to get ice in the carb.
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Old 01-02-2010, 08:51 AM   #18
Woodsrat
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Quote:
Originally Posted by RebelMoby
...Also I place a piece of maliable copper tube along the exhause and tie it down with steel wire and a piece of hose from the tube to the airbox on my winter 'ped so the carb does not ice up in low temperature. The tube preheats the air the carb is sucking in.
Very, very clever...
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Old 01-02-2010, 11:36 AM   #19
YamaGeek
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Yeah certain engines seem to be more prone to have carb icing than others. My old Mazda B2000 did this on occaision even with the exhaust preheat snorkel in place.

I never had a bike ice up on me. I took the C102 out for a 10 mile trip into town last week with air temps at about 35 and ice on the road in places, it ran fine.
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Old 01-02-2010, 03:33 PM   #20
hugemoth
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Here's a pic I took several years ago of ice build up in one of the Bing carbs on my Rotax aircraft engine.

Q

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Old 01-03-2010, 06:55 AM   #21
kraven
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Quote:
Originally Posted by rufus
When you open the throttle there is an air pressure drop in the intake. Water vapor freezes at a lower temp when the pressure is lower. This frozen vapor ( looks like a slushee) blocks the slide. The more you open and close the throttle, the more likely you are to get ice in the carb.
this is why you let it idle until it comes up to temp.

And no matter what you ride you do need to fit a kill switch for such occasions. Stuff happens. Imagine if you'd hit a pedestrian or been hit by a passing car (don't split hairs. this could happen when you're at Starbucks or Wal-Mart)
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