You put the stabil in after filling the tank? Stabil doesn’t need to mix up with the gas?I've had my '81 for 33 years. Here's my routine.
1) Fill the gas to the top. Prevents the tank from rusting.
2) Add 2 oz Stabil.
3) Turn petcock off and run the carbs dry. As they start to stumble, add chock 'til dead.
4) Put on center stand, attach battery minder, put on bike cover, and wipe a tear from the corner of my eye as I kiss her goodnight.