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This all started after I let my bike sit for a week or two last summer. Before that I had used it almost everyday riding about 80 miles a day (commuting to work, etc.). I ended up overfilling the oil by about 1/4 to 1/2 a quart...accidently...thinking that more had leaked out than I had thought (The low oil light came on). The oil would splash up through the air intake and make a mess everywhere.

After fixing the oil level I let my bike sit for a week because of rainy weather and laziness...I missed the driving comforts of a car a little

So after this little sit and ever since my bike stalls when in neutral or when the clutch is disengaged. It is like the idle speed it just a little too low...the rpms drop to idle...then it begins to struggle to stay running...and eventually it stalls. Sometimes it idles normal for 5-10secs and sometimes it stalls pretty quickly.

The way I have been keeping it from stalling is using the choke to keep the revs up but it sure is annoying to be fiddling with that thing all the time when I stop or get ready to take a turn.

Things I've tried:
1. Replaced the air filter because the old one was dirty and had gotten oil all over it.

I put about 8oz of seafoam in with a full tank (4gal) of gas and I have probably used 1/8 of the tank...so time will still tell whether the seafoam does anything.

Any ideas? thanks!

how are the plugs?

haven't checked them, i will tomorrow

This is after the bike sat for 24hours:

The plugs look fine other than some oil on spark plug #1 and hardly any on #2.

#3 and #4 are clean.

There are no excess deposits (besides the oil i mentioned) and nothing suggests that the motor is running too rich or too lean.

Would changing the plugs be a good idea anyways?

any suggestions?

Does the bike's engine slow down and die when it's warm, or just when it's cold?

it also dies when it is warm

Tried checking for vacuum leaks? Spray some WD-40 between the cylinder head and the carbs with the bike running. If the RPMs jump up as the WD-40 is getting burned, you have a vacuum leak. Also spray some between the carbs and the air box.

starting fluid works better than WD40 for finding vacuum leaks, have a fire extingisher near by.

If you never cleaned the carb after the first time it sat-up, that is your problem. Fuel breaks down a lot quicker today than a few years ago. It also has less detergents. If any one starts noticing hesitation when they accelerate halfway in their power range, the intake valves have heavy carbon deposits on them. Easy fix and should be routine, add Amsoil Fuel Additive. Works wonders. Just change the oil afterwards. Also, Yamaha Combustion Chamber Cleaner and Ring Free work well.