Join Date: Mar 2002
Location: Austin, TX, USA
Good question. I winterized my motorcyle one year and drained the carbs for good measure. When I went to use it next spring, they were so varnished up that the floats were stuck. The float bowls were full of white powder and yuck. I alwasy thought after that I would put stabilizer in, run the motor until the fuel bowl was full of stabilized gas and leave it. I suspect that even stabilizer can evaporate and leave the same mess. Not sure.
If I were storing for longer than a few months, I would be inclined to drain the carberator, remove the bowls and blast them with WD-40 or something until they were wet. Perhaps that would prevent the varnish buildup. Might be good for the jets / air bleeds etc. also. Silicon spray would be better for the gaskets, diaphrams, and other rubber components. Old Holley fuel pump diaphrams will turn to a concrete-like substance after setting dry for long periods of time.