I have had a slight idle problem for some time now. It happen when the bike was sat unused one winter, ever since then I have had a problem with the bike not idleing down correctly when goin through the gears, the idle wants to stick for a few seconds. Cleaned carb and reset correctly, didnt help. I have a 2007 kawasaki 450f. Very frustrated with the issue. Any suggestions would be appreciated.

Check your carburetor or or throttle body for obstruction.
Clean intake and reset idle.

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Replace the starter solenoid.

Sounds like the clutch plates may be stuck together. Happened to me after a long trip in the rain and bike sat for a few weeks after that. Had to take the cluch discs out and clean them

If the bike sat without being used over the winter It could be bad gas. if gas sits without being used for an extended period of time it destabilizes and gums up carborators and fuel injectors, you need to add a fuel stabilizer to gas when storing for winter. To fix the problem the gas has to be drained from tank, then refil with fresh gas and appropriate amount of carborator/fuel injector cleaner/treatment. Then start the bike and let it run it should clean itself out and start running smooth. If bike did not sit unused for winter its possible they installed the wrong plugs sometimes they talk you into spending more money on platinum or split fire/gimmick plugs (always use the exact same plug that came in the bike when it was new!!!!!)

Get car oil out - friction reducing properties ruin wet clutches - put bike oil in
Make sure cable is adjusted properly
Plates may get stuck together after time unused - see my tip for quickly releasing seized clutches
Ride Safe
Bike-Doc

The problem is that over the winter water tends to condense inside the fuel tank. If you did not replace all of the remaining fuel from the tank it might be contaminated with water.
Try to leave your bike with a full tank next time you live it unused for a long time.

Most likely the problem is not the fuel filter. Since the bike sat through the winter, it is probably fuel gummed ports/jets. This is happening more often especially with the ethanol blend of fuel. In the last few weeks, as riders bring their bikes out of winter storage, there has ben many with the same problem as yours. I recommend pouring at least 1/2 can of SeaFoam in the tank, lock down the front brake and rock the bike back and forth to mix the additive. Once it is mixed, crank the engine and run at high idle for a couple minutes. Let it set for an hour or so to give the SeaFoam time to work. Crank the bike, and ride normally. It should clear up. If it doesn't clear up in an hour or two, you may have water in the carb bowl that will have to be drained.

Before adjusting the carb, has the bike been setting for a long period of time? Has anything been done to the bike that would change carb settings? If it's been setting, there is probably a gum build-up in the jets and fuel passages. If it sat all winter, my solution is to add 1/2 can of SeaFoam to the gas, lock down the front brake and rock the bike back and forth mixing the fuel and additive well. Start the bike and run at a high idle until engine temp is normal. Shut it down and let set for an hour or two, allowing the mixture to work in the carbs. Restart and run at high idle again. If it seems to clear up somewhat, ride the bike several miles to check if it worked.

First inspect all hoses and fittings on carb and intake manifolds to heads to ensure you have no vacuum leaks drawing in air...leaning out the mixture.

Has the bike sat over winter? Pretty common for stored bikes to have varnish plug up the small orifices in the carb...and they affect idle. A product like Seafoam added to fuel tank and running the bike to get the treated fuel in the carbs and letting it sit a day may start dissolving the deposits.

try uping your idle and leave choke open longer.

best of luck, safe riding