<epetrevich@relavis.com> wrote:
>
> Here is an answer that my buddy gave me about the vacuum hose that runs to
> the carb and radiator.
>
> I may be wrong, but this could be a carb heat system. Some carbs have a
> tendency to freeze in cooler climates as the pressure and temp drops across
> the jets, especially smaller ones. My guess is heated air from the rad
> vents up the tube into the carb body. I'm not sure how common this is in
> US market bikes, but many destined for europe have it. Piston/prop aircraft
> almost all have carb heaters, since you can't get out and push if it
> stalls.
>From the original description, I doubt this is it. There was no return line
>described
(although it could have a water passage built in to the head/intake). Most
cars
that have coolant lines to the carbs use the coolant to regulate the choke.
As for carb heat, a lot of cars also have it now days. It's the little flap in
the air
cleaner that sucks warm/hot air from across the exhaust manifolds - although
this is mostly for emissions, if the engine dies you just don't move, you don't
die in a car due to carb heat...
Most air planes are air cooled, so they mostly suck air from across the exhaust
manifolds also...
I once had a home made Corvair powered dune buggy. My brother and I
made an intake manifold to mount a holly two barrel carb. The problem was
the runners were about 2 feet long and pretty much straight up. Rev that
thing up, and we'd have ice forming on the tubes - even in the 105 degree
desert...
We couldn't decide if we should replace the manifold or strap the six packs
to it... Made a new manifold since we already had a pony beer keg for the
gas tank, and six packs would have been too much... 8-)
Tim Mullen
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