Yes, that should drain the bowl. Does it start if you give it a quick shot of starting fluid?
I thought of using spray starting fluid but didn't have any at hand. I was going to ask a friend for some advice and borrow his can.
I am using a funnel through a gas line to fuel the carb. No gas came out the screw plug hole. I did not do a complete breakdown of the carburetor. The bike sat for 10 years with gas 2 quarts gas in the tank and with the gas valve on reserve, but the carb looked clean except for a little thick dark liquid in the bowel. The other parts were clean. I know it doesn't take much to clog a carb, and the best is to do a complete disassemble and replace gaskets, o-rings, etc. I used spray carb cleaner everywhere I could without taking it totally apart, through every orifice. I didn't have an air compressor here.
The gauge shows 3,144 miles, I believe to be accurate by documents and talking to the 2nd owner.
Yamaha said there is no carb kit. I asked earlier in the forum if there was a good place to get one and I looked around the net, but didn't find one. If anyone knows where to buy one, please let me know.
Also, my '87 TW didn't have vent hoses coming from the bottom of the carb. There looks like 2 nipples there. Do both need vent tubes?
Couldn't find a diagram in online manual or ron ayers fiche, with carb and vent hose placement, inner and outer dimensions and lengths. This would be a great help if someone is doing a rebuild and can take the time to take pictures and post them here.