A little background:
I have an '03 Predator that I purchased new about 4 weeks ago. I took it out for the first time the weekend after Thanksgiving to break it in. On one ride, when coming to a stop, the engine backfired and, from that point on, the engine would not idle. When I released the throttle, it would die. I had suggestions about the pilot jet being clogged or the spark plug fouled but I thought it best to let the a dealer handle it (In case something else was wrong, it could be covered under warranty).

I took it to North County Yamaha (San Marcos, CA - also a polaris dealer) to have it checked out. They called me today to tell me the bike is ready. I asked them what they found out about the idle issue and they told me all they did was to adjust the throttle.

Now, correct me if I'm wrong (Please), but shouldn't the bike idle even when the throttle is completly closed? I'm not a mechanic but I've rebuilt more than my share of carbs on cars, and each and every one had an idle jet. The idle jet is supposed to allow a minimal amount of fuel to be fed to the engine when the throttle butterflys are closed. Am I off base here with the carb on the Predator or is NCY not the place to take the bike for repairs?

Comments? Thoughts? Suggestions?

Thanks.

Sounds alright, it could of been clogged

You may just be wrong to an extent or right to an extent depending on if your an optomist.

Aside from the pilot jet that governs your idle mixture, your carb also has a slide in it that controls the air intake. Play bikes, your predator included, should have their slides adjusted so there is a tiny amount of air going by with the throttle fully closed. This allows the motor to idle. Race bikes, in order to take advantage of all available engine braking in corners, have the slide completely closed and won't idle. That's why you see mechanics revving the race bikes for the racers.

While it sounds fishy that your problem was an out of adjustment slide on a new bike, I suppose it could happen. How does the bike idle now?

also the [redator has a cv carb that uses vacuum to control the slide valve, a bchfire may have stuck or something possibly.

I've had that on my Predators. The throttle cable has a adjuster both on the card for Idle speed and the cable itself has a adjuster for length. One of my predators had a break at the cable adjuster, the idle would fluctuate randomy until I replaced the cable. The other one the cable got in a wrong spot under the gas tank and would stick. The cable needs to be able to have a clear path from the handle bar to the carb.

The backfire would depend on what the RPM level was when it backfired.