How did I get Hydro lock

Sorry I didn’t proofread it and I talk into this thing but I think you can figure out I had it towed to my mechanic and Its a speedster not as sweet Stu.lol

What did they fix?

Did they do an oil change?

The cause of fuel in the engine could be float level,stuck needle valve or over pressure to the carbs.

In any event the fuel has washed the oil leaving it deficient.

What Mikelb said is spot on. Gas has some how leaked through your carbs and filled the cylinders and crank case. This happens when you have a bad float or bad or stuck needle valve. The needle valve can go bad on weber carbs when running higher than 3 lbs of fuel pressure. That is why almost all use a good adjustable fuel pressure gauge. I hope they fixed the original issue and changed your oil. I had this happen to me. I ran the first oil change for 100 miles and changed it again. it was fine after than. I have had this happen on a Corvair engine as well. Good luck fellow enthusiast.

If you still have the OEM mechanical fuel pump, the rubber diaphragm splits/deteriorates (especially with ethanol gas) and gas will bypass it directly into the crankcase.  Fix is to rebuild with new gaskets/diaphragm (newer ones aren't rebuildable) or go with a rotary electric gas pump.

Also if you park on an incline with gas tank higher than the fuel line/carbs, it can leak if needle valve/float is the least bit leaky.  Many add a manual fuel shut off valve up front under the tank to shut off all flow when being stored.  One from ACE HW for a lawnmower works fine. This will prevent fuel smell and fire hazard when parked for winter - if stolen it won't get far either.

I would drain and refill the oil shortly as one change won't get all the gas out of the engine.  Gas is not a good lubricant for bearings. Get a good fire extinguisher for peace of mind!

Thanks for the ideas.  I am not parking on a incline, I moved and don’t expect this to happen again.

i converted my twin carbs to a single and very happy with performance  and gas mileage.  Yes I had a bit more acceleration with twin carbs but I am not concerned.