What is wrong with my motorcycle?

I want you to check three things.

) Easiest thing: Clean your spark plugs with carb cleaner, a wire brush, and compressed air. It's absolutely possible to fuel-foul a plug badly enough that it won't fire UNDER COMPRESSION. It's very easy for a plug to fire out of the cylinder; it takes quite a bit more to fire under 150psi. This has happened to me more times than I care to remember.

) Next easiest thing: Check your compression. Your bike is liquid-cooled, and you left it out over the winter. Were you running the right mix on your antifreeze, or did you have too much water in it allowing it to freeze and crack your block? Maybe your piston-rings are jammed in the lands and you don't have good compression. Lots of maybe's here.

) What Jim said. The pilot jets clog very easily, and provide the fuel for idling conditions. Squirt carb cleaner in each one and blast it out with compressed air. Wear goggles, cuz carb cleaner in the eyes is an experience that just keeps on giving.

As for going to a shop, they should be able to run their tests in less than an hour. Ignition system, compression, then fuel system. This should only cost an hour's labor. Of course, the cost for fixing what's wrong will depend on, well, what's actually wrong.

Good luck.

Those doggone 600's -if you haven't done this ,change the spark plugs-20 bucks say they are fouled and wet.When you try to start a carbed bike with a weak battery,that is exactly what happens.Do the easiest thing first,take the tank off and check the air filter and then change the spark plugs.Then try to start it and if it is below 50 use the choke till she fires.You are not the first one having that problem this year.

I've paid an hr for inspection.

That U have gas IN the carbs, does NOT mean gas is getting to cyl., could still have plugged jets.

Plugs were what when u took them out - dry, wet, black?

After u wire brush your plugs, u can just throw them away and take it to ChopperBob.

An engine needs three things to fire. Fuel, Fire and Air. You have fuel, you have spark, do you have air???

Mice like to build nests in the airbox. Did you check there?

Most probable cause would be clogged pilot jets in the carburetors.

The pilot jet's openings are as thin as pin heads and easily clog with untreated gas.

Just looking in the float bowls is not going to show whether the jets are clogged or not.

Remove the pilot jets (not the main jets) and hold them up to the light - you should be able to see through them.

sounds like coils have gone. Check for moisture in the well as condensation can build in here over the winter.