I don't know if this is directly applicable or not, but I recently had to clean
up
a set of carbs on a two-stroke m/c that had been sitting for several (>5)
years, and
also try to clean the rust out of another m/c that was sitting around for 1-2
years.
Yamaha makes some products for m/c to do both. They have a varnish cleaner
that is
mixed in diluted concentration with gas; you pour some into the tank, add gas,
run
the vehicle to get it into the carbs, and then let it sit. The varnish cleaner
came
in (I think) a quart-size container. I cheated and poured it into a pan, and
just
dropped the carbs into it. The stuff was very effective, but I used it in much
higher
concentration than the directions recommended.
The other product (the rust remover) was a two step rust remover and
neutralizer.
It involved using the rust remover and hot water, and letting the product sit
for
several hours. It was worked well on the rust, and seems pretty acidic (killed
my
nose from fumes just from me holding my breath and trying to peer down the
filler
hole. I imagine it would attack varnish with the same zest.....
FWIW, I think it was around $25 for both products (the varnish remover and rust
remover/neutralizer)...
Good luck!
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