Right now, not too much. I carry a small/spare gas tank full with pre-mix. (not necessary to have that, AND spare oil) I carry an extra drain plug, and some goodies to deal with what I think is my engine's low vacuum pressure. I'm told Yamahas often have low VP and yearly impeller changes don't remedy the situation. So, I carry a fine wire to clear even the smallest debris from what my mechanic calls the "pisser" hose. Starting it the first time this season, it didn't spit any water out the back and before long, the overheat alarm came on. I figured the impeller was stuck/dry so I disconnected the hose from the block, and primed it with some fresh water and a large syringe~worked perfectly. So, I'll be keeping one of those on hand when I hit the water the first time this weekend. Don't anticipate any issues, but better careful...
Cheers,
Rob