96 Thunderbird runs bad. Gas/oil mixture draining from airbox.

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I had a similar condition on an old BMW. It was suffering from the hairline crack syndrome. Once the bike warmed up, the coil started to discharge itself onto the GAS tank But before you replace anything, you really should test it. The Haynes manual will guide you, all you need is a cheap multimeter from Radio Shack or Sears. I'd also warm up the coil with a hairdryer to see if that has any effect on internal resistances. I'd also check your air and fuel filters. A clogged up air filter will make the bike run a little rich, not a big deal when cold, but will become noticable when warm. The crank sensor is easy to check. Just measure the resistance using your multimeter, and compare with specs in the manual. BTW BMW wanted $600 for my old R65. Fortunately I found a retired elec. engineer who rebuilt mine for $120. The ignitor may not be so easy. Back in the 80s, a few simple resistance measurements would tip you off, but todays ignitors are too complex for this approach. The dealership may have a scan tool to help you out, or you might be able to find another America rider in your locality who will let you borrow theirs for a few minutes to see if that helps. I'd also also check your gas tank vent. Run the engine until she starts to stumble, then open your gas tank cap. If you hear air rushing into the tank and/or the bike starts to run well again, your vent line is probably clogged. These intermittant problems are most fustrating. Take your time, you'll eventually figure it out. When you get really PO, take a break. Kicking the bike will not help ... I've tried this approach and it doesn't work! Good luck with it

SOURCE: I have a 2000 Triumph Thunderbird with low miles.

I assume that this bike is carburetted. Most likely the float needle in the carburetor, (or carburetors if equipped with more than one carb), stuck when you first turned on the gas. If the gas has stopped flowing when you open the petcock, you should be OK to start it. If the problem persists, you will probably have to pull down and clean out the carb(s). Pay special attention to the needle and seat. Make sure the needle has no corrosion present, You can use Scotch-bright to clean needle and seat.

SOURCE: new to me 05 Triumph

You gave a great amount of info, But have the exhaust been modified? If so you will be needing to re-jet the carb.s If not try running Seafoam thru the carbs. Drain the tank down to about 1/2 gal and mix in the proper amount of Seafoam and run that thru the carbs. Seafoam can be found at most any auto parts store now.
Following is a list of symptoms, either of or a combination of which, one may experience because of a defective throttle position sensor: A TPS will effect the engines ign. system thru the computer.

• Bucking and jerking of the engine
• Idle surging
• Sudden stalling of the engine
• Hesitation while trying to accelerate
• Sudden surge in speed while driving on the highway.

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it takes a lot of work to get carbs out first u need to loosen all clamps losen air box remove boots from carbs and slide the tripple pack out left side of bike its gonna take some wiggling no need to remove throttle cable or choke cable bowl r very easy to open once u have them out of bike use some zip tyes to hold them to frame only open one bowl at a time so not to mix up internals between carbsdo not i repeat do not separate carbs u will be soooo sad. there is a small pin and spring on back of float slide out pin and take out float and spring remember which way spring and float were atatched take a picture for refrence if your carb boots r worn and cracked now is a good time to replace them since u have the carbs out since it is such a pain to get them out