Yamaha XS650 backfire - Page 13

 

Yes, there is an impact on the lifespan of the rubber boots when
solvents that de-vulcanize the rubber are applied.

If the rubber is so hard you cannot remove the carbs, you need to do
*something* to soften them, or you cannot make necessary repairs.

Running a hose from your hot water heater to route very hot water over
the rubber boots is also going to devulcanize the rubber if it's hot
enough.