Hi all, I had given to me a 2017 Toro ztr with ( I think is a Loncin engine ) 708cc 24.5 hp engine, Model # 127-9040. The guy told me it was a real smoker. it been setting in my garage about a year and half till I finally got time to check it out. When I tried to start it would turn over till hit compression then stop, put in known good battery same thing, pulled valve covers put on tdc .020 feeler gauge fell straight through lol, set valves put valve covers back on engine started right up, motor sounded good ran good but immediately started to smoke. My garage is 30x40 and in less than a minute ( no kidding ) my garage was completely full of smoke, I have never seen any engine smoke like that in my life. checked compression 95 Ibs both cylinders, looking at engine diagram I seen what is called a valve breather or reed valve (which I know nothing about really ) the cork gasket was totally saturated with oil like it might be filling the cavity up ( is this normal ). Could this valve be sucking to much oil into the cylinders ( right plug was dipping with oil. Could blown head gasket (s) make it smoke that bad. what do you think.
kbowley
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Is the oil level correct? Did you change the oil and filter? From your description, the crankcase is building pressure and blowing out the breather tube. Remove the breather hose from the air cleaner and see if it is blowing oil from it. let us know...may be bad piston rings but usually the compression would be low.
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Yes, you have a Loncin engine, probably model 2P77F. Attached is the service manual for your unit. Start with the simple things first. I’m guessing either a blown head gasket or carb problem. Start by pulling both plugs, remember which side they came from and look at the color. Also, smell the oil for gas. Let use know what you found and we’ll go from there. What did you set the valve clearance at?