Hello, your 23 is a very nice looking unit, what's the history of it? Do you know what maintenance has been done ? Pull the carb , little bit off a PITA , but I have found best bet is to at minimal,spray clean it (carb/choke cleaner) and put a kit in it. Simple kit with gaskets and primary fuel needle inlet and seat (Kohler kit is # 25 757 02S). I find it easier to pull the intake manifold with carb attached first then remove the carb from the manifold you'll need two new intake manifold gaskets (Kohler # 48 052 02-S) and the carb to intake gasket ( Kohler # 271030-S). If the heads haven't been pulled and cleaned, it should be done (Kohler recommends every 500 hours), your tractor should have an hour gauge , it can be your guide. IMO if it's close pull them and de-carbon as aforementioned, relatively simple procedure done with engine in tractor, however the left side ( furthest back of the two piston jugs) the heat shield (firewall) will interfere with head bolt removal, I use a set of hand sheet metal brakes to bend it out of the way then back into position when process is completed (Kohler head gasket # 48 041 13-S) Also IMO to properly clean carbon deposits you should pull the valves,which means a valve spring compression tool and I'm old school so 'if a valve comes out it should be lapped on reassembly'. There are very good, well made (USA) tools for this procedure. Check out e-z bore motorsports on ebay (for starters) they have the compressor ( I use the Zim #70-174) and the lapping tool ( I use the Zim #301 reciprocating hand grinder). Actually the C- clamp style compressor works better on horizontal valves, but I think this one is more universal and will work fine for you, just a little T&E till you get onto using it, e-zbore also sells grinding compounds in various grits and in smaller amount containers. Remember the heads and piston are aluminum when cleaning only use a softer style wire brush ( hand, in drill or die grinder) stubborn carbon just means more elbow grease.I also recommend obtaining the "Kohler two cylinder service manual" covering the K-482, 532, 582, and 662 engines I believe it is publication # ENS-607 it will cover all aspects of maintenance + reconditioning of engine.The valve cover gaskets are Kohler 270034 and the valve adjustments are: intake (cold clearance) .008-.010) and exhaust (cold clearance).017-.020 Also head bolt torque down is 35 ft lbs and a recommended tightening sequence, again if you don't already have the service manual I recommend it, these tractors are contagious ( I see you recently added an 1886) so I believe a little bit of investment in what I've mentioned will pay for itself long term! Good luck on your trouble shooting , if I've stated an amount of information all ready known to you.. amends. Regards. Kevin
Couple items to note: do the valves one at a time then reassemble before you pull the next one , then continue with same procedure.
Carb w/mechanical fuel pump , ( on these Kohler twins) are notorious for the main fuel valve sticking in the seat holding the float in position allowing a syphon to be drawn thru the fuel pump and filling the crankcase with gas. A simple inline shut off like the Stens #20-5841 out where it's easy to get to ( and see) will alleviate the problem when you shut it down
Edited by WrenchinOnIt, March 06, 2015 - 01:43 PM.