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Jay146992 · #1 10-09-2012, 04:39 PM

I have a 2007 exmark lazer z with a kohler 27hp cv740 (unknown hours. Hour meter stopped working at 1250) The engine is blowing white smoke at idle and when throttling down but does not blow smoke at full throttle. It also uses a lot of oil. I did a compression test and one cylinder has 150 psi and the other one has 130. The cylinder with lower compression has a really fouled plug covered in gunk but the cylinder with good compression spark plug looks clean.

While the engine was running I pulled the dip stick to add oil and it started spraying oil and smoking out of the dipstick tube.

I'm thinking it could be the rings or a head gasket?

piston slapper · #2 10-09-2012, 06:55 PM

Your compression is pretty low...180 psi new..with both readings below 150 I would guess its both..rings and head gaskets...
BTW...if you remove the dipstick on any engine when its running...its gonna blow oil...
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Oldtimer · #3 10-11-2012, 05:49 PM

Could be blown head gaskets to cause that much blow by. Not a big deal to fix. The head gasket kit comes with new head bolts too.

Billsz28 · #4 10-12-2012, 07:54 AM

Look at my thread "hustler z losing power" you should find it helpful, photos are included as well. I had a very similar problem and the issue is now resolved
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joe billy · #5 10-12-2012, 10:09 AM

If you are using so much oil that its fouling a plug, its more than likely got at least one leaking head gasket. Do a leakdown test before pulling the heads to check the condition of the piston rings.