Unfamiliar with the 09 >
I think I`d suspect that petcock...
BUT
I`d Check oil level to see IF there`s Gas in the Crankcase,
Dennis
We Got busy with "Other things" and I did Not ride as planned...

I I did NOT Procrastinate, I simply prioritized Farm work into the schedule...

Although I CAN & Do Pro-crastinate,
Dennis
View attachment 328274

 

That one has a vacuum operated auto-shutoff petcock. They can go bad and allow fuel to run down the vacuum line into the intake, definitely check the oil level. People have bent connecting rods trying to crank one that is full of fuel. The piston coming up could have caused that vacuum line (item #9 below) to blow off the back of the petcock.

I'd look for a manual on-off-reserve petcock to replace it and ALWAYS shut the fuel off if stopping for more than a quick lunch. Make it a habit, turn key off and petcock off together and on together.

https://www.ronayers.com/oemparts/a/hon/505400e1f870021c54beb315/fuel-tank

Edit: another possibility is the float needle is gummed up and stuck open after you rode it.

Or the fuel tank vent is blocked, hose pinched or a bug built a nest in the hose, and the fuel vapor pressure from a rough trailer ride forced fuel past the needle and flooded it

 

Yes because when I took it for a test ride it ran fine. After transporting it, it started to do that.

 

Chances are the 16 yr. old diaphragm in the petcock crumbled in 300 mi. Might as well service the tank while rebuilding the petcock. I always shut off the petcock manually regardless if its auto or manually operated especially the float needles leaking with age and failed petcock diaphram equals "hydrolocking" the motor as oldguy mentioned. Bike sitting is worse than riding as for keeping it right so to speak, we're here for support. Be sure to check for critters in the air filter.

https://www.partzilla.com/product/honda/16953-KEA-023?ref=dd92280de25d3dce269af276d79ae23471bcd1e8

 

Chances are the 16

Thank you for the advice. I went ahead and drained the old gas in tank too. Ordered a new petcock after seeing that one on the screws had been stripped leads me to think it had a kit done to it before. I did smell gas in the oil from possible flooding. I'll change that out too.