Is there any reason that my bike should be blowing through spark plugs?

Kyle,

You need to be more specific, just saying your plugs are going out doesn't tell us anything. In detail, describe what the plugs look like and how they are "going out" and how is the bike running?

883 or 1200 conversion, if converted....when was it converted and what kit was used and still stock 883 heads or 1200 heads?

How many many on bike?

Is the ignition stock or aftermarket?

Do you have a factory Harley tach on the bike?

What brand & number plugs are you using and what gap?

What carb on you running?

It is a very common misconception that Harleys coils go bad alot, only about 10% of ignition related problems are bad coils and/or plug wires, about 10% are bad ignition modules, about 10% are faulty VOES (vacuum advance switch) and about 70% of the time its a faulty cam position sensor, if this needs replaced, the timing must be reset, the cam sensor is the timing adjuster plate.

Without knowing secifically how the engine is running and what is wrong with the plugs, here are some ideas.

Ignition timing is off, timing can not be properly set if VOES is not working properly.

Plug gap is incorrect....stock ignition .040" aftermarket ignition AND coil set at .035".

Wrong plugs being used....best plugs are Autolite 4164....DO NOT change heat range!!!

VOES not functioning....replace with aftermarket switch pre-adjusted at 6" vacuum, can get any bike shop to order from from Drag Specialties.

VOES hose is cracked or popped off the vacuum nipple on the carb...replace with fresh hose.

Intake manifold air leak....replace both manifold to head seals....this depends on what carb you have.....an exhaust leak at the heads can also cause a lean condition!!!

Carb adjusted and jetted too rich or too lean.

If the plugs are shiny black fouled or caked on black fouled, you have bad piston rings and/or bad valve seals.

It depends on how they are failing. Are they carbon fouled? Are they oil fouled? Are the electrodes burned?

If they are carbon fouled this could be caused from incorrect carburetor jetting. Most Harley Davidson motorcycles have aftermarket exhaust. It may also have an aftermarket intake. Both of these change the fuel / air mixture requirements of the engine. The carburetor must be tuned for these changes, usually by installing larger jets in the carburetor. This can be a hit or miss operation and it may take more than one try to get it just right.

If the plugs are getting burned where the electrodes are burning away this means a lean fuel / air mixture. You need to fix this right away. The same thing that is burning your spark plugs could very easily burn a hole in the top of a piston or burn a valve. Either can be expensive to repair. This is usually cause by improper sized carburetor jets as in the previous paragraph. However the jets are too small. When you install aftermarket pipes and change the air intake you must install larger carburetor jets.

Many Harley Davidson owners will richen up the idle mixture and slow the idle speed to get that rumpity rump sound at idle. This can also foul the plugs.

You could have a problem with the carburetor. Something like a sticking float valve can be allowing too much fuel into the engine. A symptom of this is fuel running out of the carburetor while the engine is not running. You may need to turn off the fuel shutoff valve to make it stop. Time for a carburetor rebuild.

If it is oil fouled this could mean that it is time for an overhaul. Worn piston rings and worn valve guide seals are allowing too much oil into the combustion chamber. The only real fix is an engine overhaul.

To add to Mad Jack's answer, it could require a plug temperature range change. (running too cold and not burning off, running too hot, etc).

Guessing from limited information.

"spark plugs seem to be going out unusually fast" doesn't give enough info.

"Going out" in what sense?