I dumped Bel-Ray H1R into the tank when I filled the bike last night (mixed at 32:1).
Hmmm, not the best way to mix 2-stroke fuel. It is possible that if you dumped what you believe is the appropriate amount of premix directly into your bikes fuel tank that it did not mix, especially if you poured the premix in on the petcock side of the tank. If the temperature of the premix is cold and thick, it takes some agitation to mix it. Pouring fuel into the tank might not mix it correctly. Always put the premix into a gas jug, pour in the fuel halfway, agitate it a bit, then pour in the rest of the fuel. Works everytime. Sounds like the mix is way too rich and that you have slimed the carb, reeds, and crankcase chamber with the premix.
Below is only an opinion of what to do. My 2 cents.So the bike was sitting for a week. Was the fuel petcock on? If so, did it leak fuel out the overflows?
Sometimes the carb float valve in the bowl will let too much fuel in and it will run past the reeds into the crankcase chamber without even running out the overflows. This fuel will evaporate leaving behind a heavier concentration of mix (in the carb and the crankcase).
The fix is to take the plug out, take the tank off (or plug the breather in the cap), and then tip the bike upside down. Slowly crank the bike over until you are sure piston has lined up letting the accumulation of fuel/mix in the crankcase run out the plug hole. If the residue coming out is really thick, you can upright the bike and pour some mixed fuel in the plug hole (about 6oz) and then repeat the process.
Sly