Fuel Problem with Seca 750

My bike sat for about 7 years with gas in the tank. When I got it out 2 years ago, I cleaned out the tank. There was lots of rust. Gotr a new battery. Got it to start. Rode it a few times. Then it stopped running so well. Had to use some throttle just to start it. Then it wouldn't start at all. Now 2 more years later, a friend at work wanted to see if we could get it running. The tank no longer has so much rust. I think we got that out for now. I rebuilt the fueld petcock today. New battery. Vacuum hose seems to create vacuum. I set the percock to PRI to make sure gas can get through. I checked the hose to the carbs - is clear. Spark plugs have spark. But they have no gas on them at all. So it seems as though the carbs just aren't letting any fuel through whatsoever. Using starter spray direct through air box causes engine to run until it runs out of starter fumes.

So did I miss anything obvious that would keep fuel from going through?
I wanted to unscrew the dran screw on an outside carb and make sure gas is getting to the float bowl, but the screws are in very tight, and are very soft metal.

Before taking off the carbs, I want to know if there is anything else to try.

Right now I have gumout and seafoam in the gas, and fuel petcock set to PRI to see if that will un-gunk it.

 

sounds like the fuel needles attached to the floats have varnished closed that means taking the carbs out and doing a rebuild

 

Sounds like the needles are stuck in the carbs and not allowing gas in. Unfortunately the Gumout and Seafoam will probably do little to help at this point. I think a GOOD CLEANING, as described on the site is in order. It runs on start fluid, therefore spark. Stops when start fluid used up, therefore no fuel.

 

I'll state the obvious...gotta clean the carbs. No amount of Gumout or Sea-Foam, or any other chemical for that matter, is going to "un-gunk" the carbs. Only way to get them clean is to tear them apart and put some elbow grease into them.

 

Another vote for carb cleaning. I also suspect that you will find that the small dome-shaped screens above the float bowl valves have clogged up (if you did not put an in-line fuel filter in place after cleaning the tank). You can just take the screens out and toss them - definitely install an in-line filter regardless before you try using the carbs after cleaning.

 

I used to advocate pitching the "beanie" screens as well; but after some discussion here as to their potential "insurance" value, I've crossed over.

The "beanie" screens are your last line of defense against a float-clogging hunk o'crud; replace them.

 

BigFitz - there is a pre-filter in the petcock stack and an in-line sintered bronze filter. If the piece of crud is small enough to get past the 2 filters, the beanie screen will do you no good. If I were really conservative, I might put 2 in-line filters in place (if I could fit them between the tank and carb rack). But probably not...

 

Ahh, but what if said hunk o'crud was newly dislodged from somewhere downstream of the in-tank and in-line fuel filters?

Like I said, I too used to advocate pitching them until the "insurance value" was pointed out.