Toilet flushes intermittently by itself.Water leaking into bowl.flapper and float valve seem to be okay.This is a hamilton 2092.

The float is stuck and the flapper leaks. Adjust the float so it won't touch anything, it needs to move up and down freely. Replace the flapper,

If there is a continual leak in to the toilet bowl you will likely need to replace the flush valve or the toilet flapper.

As a first step try try cleaning the sealing surface of the flush valve to se if the flapper will seat and make a seal.

If this does not work and the flapper is visibly detioriated and breaking down shut off the water supply, remove the toilet flapper and visit your local plumbing supply store to purchase a suitable replacement. Install the new flapper, turn on water supply.

These illustrated instruictions may also assist:

http://www.danco.com/HowTo/How-To-Replace-a-Toilet-Flapper

Although less likely, if the sealing surface of the flush valve is damaged or detioriated proceed with replacement of the flush valve. Again turn off water supply and follow the instructions set out here:

http://www.danco.com/HowTo/How-To-Replace-a-Flush-Valve

If there is not a leak in to the toilet bowl and the water flow does not shut off completely, then water is flowing through the fill valve and the overflow pipe and you may need to adjust the float and float rod to allow clsoure of the fill valve. See here:

http://www.danco.com/HowTo/How-To-Replace-a-Float-and-Float-Rod

Sorry for problem with new toilet.
You say water is leaking out of the bowl?

Toilets have 2 parts:
1) Tank: where water is stored for the flush and is sealed with a flapper.
2) Bowl: where water flushes down.

a) If tank is leaking water, then flapper is suspect. Replace flapper and see if that works.
Lift up flapper and run finger around rim to see if there is a rough spot that would indicate flush valve is defective, and needs replacement.
See typical flush valve

b) If bowl is leaking, that is very unusual and would indicate a crack in the porcelain.

If installer sold you the toilet, it is his responsibility to make good on product.
All products are guarantee against workmanship flaws.

This is diagram of a typical toilet tank setup if the refill tube is not putting water into the flush valve as pictured the toilet will do what you have described.

The Kohler Cimarron is one of the most popular and reliable toilets out there. (My Favorite). However, depending on the hardness of the water and if you use cleaner tabs in the tank, these factors can lead to a malfunction.
The first thing you should do is hold the flapper (rubber seal inside the tank that releases the water down to the bowl) down with your hands for a few seconds after a flush and see if the toilet stops running. Sometimes the flapper doesn't seal properly therefore the fill valve keeps working non stop. Stopping the fill while holding the flapper down will confirm that your flapper needs to be changed.
If this doesn't work then try this....
The other common problem with a running toilet is with the fill valve itself. There is an attached float on the fill valve that goes up and down depending on the water level. Once the water level rises, it rises the float, and the float tells the fill valve to stop filling the tank. While the toilet is running (hissing), try raising the float all the way up with your hand and see if it stops. If it stops but not consistently with every attempt, then you will need to change the fill valve. I believe the Fluidmaster 400A is the replacement model.

My toilet had same problem:
I thought it was a clog in the drain pipe.
But the problem was clogged holes where water flushes into toilet bowl.

Here's how I fixed problem.
Purchase:
Gallon of CLR calcium-lime-rust remover from Home depot.
Pumice stone from hardware store.

Home supplies:
Cut off bottom of empty clorox bottle to make container for CLR
Old 3" paint brush you don't use for anything else to apply CLR
Small cup to pour CLR into toilet flapper opening

Steps:
Look inside toilet bowl under rim and see holes where water comes out
Use brush and apply CLR to holes where water comes out.
Use pumice stone to scrape ... pumice stone will not hurt toilet surface.
Flush toilet to clear holes so far.
Turn off water to toilet.
Open flapper to drain tank.
Keep flapper open.
Use cup and pour dose of CLR directly into flapper opening.
(You can also pour CLR down overflow tube... but flapper opening puts whole dose directly onto problem)
Pour another cup of CLR into opening.
Notice how CLR starts coming out the holes into bowl.
Pour CLR down flapper hole until it runs easy and fast out of holes.
Close flapper, turn on water, toilet fixed.

Found your part: http://www.kohlerserviceparts.kohler.com/AccessoriesInformation.aspx?ServicePartID=f5a368efd5b74bcfae7fa0d0bb69bd39

this sounds like a leaking flapper.although you may not see a leak, this is always the problem.a leaking flapper can be replaced,just becauce the toilet is new does not mean that it may not have defective parts.i would check the flapper first then the fill valve.this will most likely fix your problem.good luck with your project.

You need to replace the tank flapper valve gasket.

These models need to have a flush valve flapper that has a styrofoam float on the lift chaninof the flapper. Go to hardware store or home improvement store and get a 'Korky brand toilet tank flapper with float 'ball". Cut the rubber ring piece away from the flapper and you don't need it (see cut here marks on flapper). Install flapper and adjust the float fairly close to the flapper.
When the water level drops in the tank and reaches the level of the float on the opne flapper, the flapper quickly closes causing the toilet to have a "surge" of siphon action which forces the water in the bowl to be drawn out.