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I guess things must have all added up in just the right direction this morning. There I was, on my traditional Sunday morning "constitutional", having left the house in the pre-dawn cold, and the bike started running very poorly. Just didn't want to take the throttle. So, I pull over to investigate, and both manifolds under the FCR's are good and frosty. I would have thought that impossible, being nestled all snuggly warm between the two jugs and under the tank. It must have been the combination of mid 30-ish temps, being very close to the dewpoint, not riding it hard enough to really heat it up (cautiously looking at the frosty road...), but keeping it spinning up a bit under light throttle. After I stopped for coffee and an English muffin, giving it some time to thoroughly heat soak, the problem went away and it ran like a happy camper all the way home.

I'm not really complaining or anything - more just sharing my experience. I've had this happen on other bikes, and there really isn't much to be done about it. It just never happened all last winter on this bike, so I thought it might be immune from it. Guess not. Anyone else ever experience this?
 

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early nineties monsters have got heated carburator float chambers,
they have got double walls and the hot oil running through them.

i had problems with an iced carb on my race vespa when i was young,
but couldn't figure out what the problem was at that time.
some bikes have got a simple large diameter copper wire running from
the cylinder base to the carb bowl, to prevent icing under damp conditions.

cheers.


ah, we say Vergaserheizung. ;)
 

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Used to happen to my monster 600 all the time when it was just above freezing temp.
Now I got some carb heating on there and it's been perfect since.
 

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early nineties monsters have got heated carburator float chambers,
they have got double walls and the hot oil running through them.

i had problems with an iced carb on my race vespa when i was young,
but couldn't figure out what the problem was at that time.
some bikes have got a simple large diameter copper wire running from
the cylinder base to the carb bowl, to prevent icing under damp conditions
.

cheers.


ah, we say Vergaserheizung. ;)
Neat idea, I'll remember that :)
 

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i saw it on a mid nineties Yamaha DT80 road legal dirt bike,
some years too late to help me with my vespa troubles.

:think: ;)
 

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i saw it on a mid nineties Yamaha DT80 road legal dirt bike,
some years too late to help me with my vespa troubles.

:think: ;)
dude - vespa troubles? Really?

j/k - I know ALL to well but I just can't quit them.
 

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ah i have seen your signature lots of times. :cool:

my last vespa ciao ran a true 75 Km/h, the last 50N Scooter
had 21hp/9000 rpm, i know my shit these days.

:cool:
 

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...I'm not really complaining or anything - more just sharing my experience. I've had this happen on other bikes, and there really isn't much to be done about it. It just never happened all last winter on this bike, so I thought it might be immune from it. Guess not. Anyone else ever experience this?
Yes I have on the stock carbs. Mind you, it was pretty chilly, somewhere in the mid 30's F. Never had it happen with the FCRs, they seem immune to it.
 
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