Pulled the bike ('04 WR450F) out of the garage to fire it up & give it a "once over" this weekend. Bike had sat up on stand with battery tender connected & carb bowl drained for the last 4 or 5 months, everything was cleaned & lubed right after last ride. Took a few tries, but started in under a minute on the button & seemed to run just fine (up & down the alley at least). When I was done aggravating the neighbors (YZ pipe) I shut off the petcock & made one more pass up & down the alley to burn most of the fuel left in the carb. I will usually let it idle on the kickstand until it quits, & then re-start using the choke &/or hot start lever to burn the last of the fuel away so that it does not varnish up the carb internals. Went to pull back the hot start lever & it would not budge. I traced down the cable starting at the lever to check for kinks & could find no obvious issues. After unscrewing the zip-ty racing hot start cable nut from the carb body & closing the cable sleeve adjuster all the way down, I finally freed the cable end from the plunger by rooting around in the carb recess with a pick. There was a decent amount of white corrosion build-up around the top of the plunger, which was keeping it from moving upwards in the plunger bore. after much soaking with carb cleaner & fiddling with a pick I was able to free the plunger from the bore, but not before breaking off both of the extensions on top of it that grip the end of the cable. I've ordered a new plunger, seal, & spring (the cable seems to be fine) & hope the parts arrive soon. Has anyone ever had a similar experience? The only reason I can come up with for this happening would be if when I lubed the cable after the last ride I displaced some water that had gotten into the the cable sheath down into the carb. I guess from now on I'll disconnect the cable before lubing after a wash.