Kohler 17.5 HP will not start

[goatbreath]

I have a John Deere L110 with a Kohler 17.5 HP Model # CV491S, Serial #3302502241, Family # 3KHXS.4902GB, Spec # 27509, Displ (CC) 490
It all started by cranking and running the engine , then lots of white smoke and gas/oil? coming out of muffler, the engine stopped and will not restart.
I can only get it to run by pouring gas into the carburetor, it runs for 2-3 seconds and smokes badly white smoke and stops. I have cleaned the carburetor 2 times , the carburetor bowl always has plenty of gas in it so I'm pretty sure the fuel pump is ok. The solonide on the bottom of carburetor is working properly (when 12 volts applied the plunger moves down). I have removed flywheel and flywheel key is ok. I checked the valves and from what I read the valves are hydraulic lifters and are not adjustable. When turning the flywheel by hand the pushrods operate properly opening and closing the valves. The intake valve is open and closes just prior to flywheel magnets matching up with coil prongs. When valves are fully closed the rocker arms will just barely move sideways/updown and when valves are closed the push rods will rotate by hand. I have a good blue spark. Compressior is 95 psi. Spark plug is firing and even tried another spark plug.
The thing I don't understand is why engine will not start by using the carburetor along (not pouring gas manually in) . The carburetor choke is working, it fully closes. Why all the white smoke?
I'm thinking maybe an oil ring broken? Maybe a bad cam? Maybe burnt valves?
Any help will be greatly appreciated

 

[mechanic mark]

Free Kohler Service Manual Downloads - OPEengines.com

Listed below are Kohler engine service repair manual in Adobe PDF format that you can download for free. Below we have provided a link to these manuals which can also be download. Click on your engine listed below to download. These service manuals provide general information, adjustment...

www.kohler-engine-parts.opeengines.com

See section 3 in your CV491S engine service manual by clicking above site, troubleshooting section.

WHAT IS GOOD COMPRESSION FOR KOHLER ENGINE CV491S? - Google Search

See page 3.4 & perform engine leak down test, possible blown head gasket.

 

[bertsmobile1]

have you checked the oil level ?

 

[goatbreath]

have you checked the oil level ?

Yes I have checked the oil level a couple of times and just a minute ago. Oil level is a little low at the add mark. Oil is new, doesn't seem to have any gas in it. Oil is the color of new oil.
Thanks for willingness to help
Mike

 

[bertsmobile1]

The compression sounds a bit lowish but I never believe those numbers
Pull the breather line off the rocker box
If it just blows a bit of crankcase fume which will fee oily to your fingers then all is fine
If it blows visible globs of oil out then you have excessive crankcase pressure
That along with the low compression reading suggests blown head gasket or worn rings
In either case the head needs to come off.
If ou have a compressor & are a tool junkie a cheap & nasty leak down tester will confirm this

 

[goatbreath]

The compression sounds a bit lowish but I never believe those numbers
Pull the breather line off the rocker box
If it just blows a bit of crankcase fume which will fee oily to your fingers then all is fine
If it blows visible globs of oil out then you have excessive crankcase pressure
That along with the low compression reading suggests blown head gasket or worn rings
In either case the head needs to come off.
If ou have a compressor & are a tool junkie a cheap & nasty leak down tester will confirm this

I think I read that this engine has a compression release and that may be giving me a faulty reading. I'm going to purchase a leak down test tool
Thanks for your help