1999 Honda Aero 1100c3. sat for two years with fuel in tank,carbs, etc. drained tank and carbs and cleaned, then reassembled. Bike will fire and instantly stall. Did have it running a month ago, but

Have you cleaned the carb power jets and blown them and there passages out with compressed air?.

Remove and disassemble the carburetors, clean the carburetor body, replace the main jets and the pilot jets with new parts, being careful not to damage the brass when reinstalling the new parts. Reassemble the carburetors and reinstall on the bike. Drain the fuel tank, inspect the fuel tank for rust or sediment, seal with Red-Kote or Caswell Epoxy if necessary. Remove the petcock, disassemble and clean all parts of the petcock, buy a rebuild kit if the vacuum diaphragm is dried or damaged. reinstall the petcock and fill the fuel tank with premium fuel. Clean or replace the spark plugs, and check that compression is within specifications on each cylinder. Synchronize the carburetors. Change the oil, drain and refill the cooling system, flush the brake system with fresh Dot4 fluid. Check the exhaust system for possible obstructions (rodent nests). Check the air in the tires. Each of these steps is essential for safe and proper performance of your motorcycle, especially after sitting for as long as 3 years.

Befor you pull the carbs Drain tank refill with 93 octane and add some good fuel system cleaner, allso change spark plugs. This should do the trick. Good luck

Hi you still have dirt inside your carb jets. You must perform a deeper cleaning of your carbs
good luck

Hi,
If it sat for 2 years, you can assume that the carburetors are clogged up. You will need to remove them and clean out the bowls and jets with carburetor cleaner. Make sure your tank and fuel lines are completely cleaned out too.

You will need to clean the complete fuel system to include the carb. After time the fuel turns to varnish and will plug up the jets in the carb. Remove the carb and clean it throughly that should fix your problem.

The slow jets and adjoining passageways are still dirty. As painful as it may be , take the carbs off and clean the slow circuit again or it will never idle. Double check the fuel pump is working properly and the fuel filter is not plugged. One time it took me four cleanings to get all four carbs working on a Suzuki that sat for five years. Also make sure none of the carburetor boots have developed rips from age.

I think you are exactly right. Sounds like you have some clogging in your idle jets and probably in need of a carb tune up. if you havnt replaced or cleaned your air filter in a while, now would be a good time to do that as well, being that some filters begin to break down and pieces of them get into the carb ports and cause clogging.

Sounds like you need to clean the carbs out, as they are probably gummed/varnished badly after sitting for 2 years.