Kohler cimarron broken seat, replacement parts don't work 2x's

Save that valve... !
Use a fluidmaster (diaphram) part #242 as a replacement substitute!!
Easier than most pill bottles... !!!
(turn off the water)
The valve seems to be very thin plastic but mine lasted 20 years before needing a new diaphram. I cold hear the water going (seep. seep, seep))... and changed the flapper valve... Wrong!
I actually bought the new white plastic one to experiment on... but never got that far... Great price ($26) from Amzn (new spare... still in box)

The white VALVE (right) end of the 1068030 twists off easier ... over the top (clockwise: less than 1/8 turn... there is a little white lock bar on the very back that has to be pressed in to allow rotation).
Ignore the (blue) float lever... you wont be turning anything that far.
The expensive & unavailable KOHLER diaphram can be substituted with a $2 FLUIDMASTER #242 diaphram... available everywhere... Home Depot, ACE, General Plumbing Supply...
(Amazon = $4 +/- shipping, (local "dealer" had nothing in stock... of course)).
Kohler.com ships for a whole lot more!
Sadly... THAT very SAME FLUIDMASTER #242 will also fit in the "Kohler 703" valve everybody seems to be throwing away (the easiest valve I have ever repaired).
The GRAY "703" valve seems to be very thin plastic but mine lasted 20 years before needing a new diaphram.
That is a hard twist 1/8 turn: counter-clockwise... same #242 diaphram... 5 minute job!
Six minutes if you hold a cup over the valve and rinse it out like you are supposed to do...

Look for broken plastic casing of the pump. A hairline crack would also leak water. Check for proper fitting of flexible hoses to & from pump. Another thing is to check for loose filter cap. A loose filter cap or broken O ring of the filter cap can leak water.

need help.ours started leaking in the front of the bowl

This http://www.kohlerserviceparts.kohler.com/ServicePartsPage.aspx?DocumentID=88e6e66a1a734f7d99da186cfcb01339&ModelID=cee07413255e448083e67df951c837d0
shows you the parts you are dealing with and they can be gotten to from inside the toilet bowl.

how to replace a flat seal on a Kohler, Cimmaron toilet

Loosen the nut that holds it in. The nut is inside the tank and is left hand threads. Or it may need a new one if any of the plastic is broken or cracked.

The exact cause of a Kohler Cimarron toilet running non-stop depends on the exact model of toilet owned. In some, the lift chain connected to the handle can become kinked, preventing the ball seal from covering the drain completely. Just unkink the chain to fix this. In other cases, the float ball is stuck against the side of the tank, preventing it from returning to its normal horizontal position. When this happens, the toilet's tank doesn't stop filling with water. The excess continuously flows into the overflow pipe. Dislodge the float ball from the side of the toilet and this should clear the problem. Likewise, you might consider shortening the armature on which the float ball sits, so it won't become stuck again.

Read more: Troubleshooting a Kohler Cimarron Toilet ' eHow.com http://www.ehow.com/how-does_5017443_troubleshooting-kohler-cimarron-toilet.html#ixzz1CxKmz9ZQ

Is the fill line in the tank loose? Does it just shoot water into the tank itself? I had this issue until I realized the while fill tube is supposed to be pushed into the black cylinder/small plastic tube in the middle of the stopper assembly. After i pushed the line into the tube, the bowl would always only fill a little bit. Now it fills almost a 3rd of the way up the bowl and doesn't bubble during flushes.

The fill valve needs replacement unless you can take the top off snd find out what is keeping it from closing. I had one I took apart for the same reason and found a piece of plastic in the valve seat. Good Luck, Ned

Had a similar problem with a Wellworth after changing out all the replaceable parts. The new triangle gasket + nut kit was missing the flat anti-friction ring needed to allow the plastic nut to be hand tightened enough against the rubber gasket - without the ring the friction stops the nut turning, and you get a leak because there isn't enough pressure on the gasket. Retrieved the old ring from the trash & put it in - works perfect now! not sure if this is your problem too, but you might want to check the locknut / gasket tightness & seal.