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oil and smoke coming from exhaust pipe 26 Jun 2022 21:01 #869406

  • Will2000
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Hi all, I have a 83 kz1100 and just just recently started having oil and smoke spitting from the exaust pipe after only riding for a few minutes. I am really hoping its not the piston rings so if anyone has any ideas that would be much appriciated! I suspect it may be the valve seals but I'm not sure as there was quite a bit of smoke coming from the exaust and the back of the muffler and inside of the pipe is all oily. Just did an oil change and replaced it with 10w40 blend motorcycle oil. Number 4 spark plug is oily and wet so oil is getting into the cyllinder obviously. 

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oil and smoke coming from exhaust pipe 26 Jun 2022 22:51 #869407

  • Wookie58
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It does sound bore related, stem seals would normally cause smoke on overrun etc. Do you have access to a compression and or cylinder leakage tester
1982 KZ1000 Ltd

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oil and smoke coming from exhaust pipe 26 Jun 2022 23:34 #869409

  • Warren3200gt
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If it has been standing for a while it could be gummed up oil scraper rings.
If it's been rebuilt it could be over lapping oil expander ring.
Other option is valve stem oil seal or head gasket leaking into the bore from the oil gallery. 
As its actually enough to get into the exhaust and not burn off I would guess oil scrapper/expander rings issue. 

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oil and smoke coming from exhaust pipe 27 Jun 2022 00:03 #869410

  • Will2000
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I don’t have a leak down tester and it was running great just yesterday did a 40mile trip so I’m hoping I didn’t overstress it. I did a compression test before I bought it and it was good but I will do one again just in case. The guy I bought it from said he did a leak down test and it passed but then again he could just be saying that. 

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oil and smoke coming from exhaust pipe 27 Jun 2022 00:04 #869411

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Darn I was hoping it wasn’t one of the rings but it sounds like it might be. I have been riding regularly so it hasn’t been sitting a while which makes it all the more frustrating 

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oil and smoke coming from exhaust pipe 27 Jun 2022 01:17 #869413

  • zed1015
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If it's been ok and regularly ridden then the likely suspect is a stem seal which is the easiest to diagnose and oil in the exhaust would indicate an exhaust valve seal as oil from a leaking inlet generally get burnt first.
Let the bike sit overnight and pull the exhaust headers.
If the exhaust stem seal is leaking it will be obvious as the valve head and stem will be wet and you will see where oil is getting past the guide.

 

AIR CORRECTOR JETS FOR VM CARBS AND ETHANOL RESISTANT VITON CHOKE PLUNGER SEAL REPLACMENT FOR ALL MIKUNI CARBURETTORS
kzrider.com/forum/23-for-sale/611992-air-corrector-jets-





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oil and smoke coming from exhaust pipe 27 Jun 2022 17:30 #869440

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I took zed1015's suggestion and took off the headers this afternoon. the header for #4 was very oily and had lots of carbon deposits when compared to the others however it did not seem wet as I would have expected it to after sitting for nearly 24hrs. I included a photo as well

Another odd aspect is it only seems to start smoking and spitting oil after riding for 5 or 10 minutes.

After doing that I ran a dry compression test and all the cylinders were within about 20% of each other although the highest I got was 100psi which is slightly concerning but I won't worry about that for now. I don't have access to compressed air for a leak-down test but I feel as that may be the next option to troubleshoot.
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oil and smoke coming from exhaust pipe 27 Jun 2022 17:38 #869441

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Last quick update, I ran it with the filler cap off and there is a LOT of blowby, nearly no suction into the filler cap

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oil and smoke coming from exhaust pipe 27 Jun 2022 23:49 #869454

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Last quick update, I ran it with the filler cap off and there is a LOT of blowby, nearly no suction into the filler cap

Before you get too deeply involved I would suggest checking the crankcase breather is clear, a blocked breather (sludge, Carbon etc.) would cause it to build crankcase pressure like this. Also check your air cleaner as crankcase pressure will push oil into the air box through the breather
1982 KZ1000 Ltd
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oil and smoke coming from exhaust pipe 29 Jun 2022 00:18 #869518

  • Will2000
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Thanks to everyone for all the great suggestions! I will check the crankcase breather as Wookie58 suggested and have arranged with a buddy to use his supplies to do a leak-down test as well. as someone pretty new to motorcycles I really appreciate all the help!

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