Oil in Exhaust???

Discussion in '1st & 2nd Generation 1983-1989' started by Musicman333, Apr 1, 2019.

  1. Musicman333

    Musicman333 New Member

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    Hey all, I finally got my 1986 vf500f running, the previous owner says it sat for years. I rebuild the carbs and did a bench sync and have new oil in it. After letting it run for a couple minutes I noticed a very bad oil leak out of the exhaust where it connects to the muffler. Its a 4-1 system. And the idle is erratic. The PCV system was completely bypassed by the previous owner. Could that be the cause or could the piston rings be bad?
     
  2. Diving Pete

    Diving Pete Insider

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    compression check time
     
  3. Musicman333

    Musicman333 New Member

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    I was afraid of that. Damn it only had 8700 miles on it supposedly too
     
  4. Captain 80s

    Captain 80s Insider

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    Something doesn't add up. That would be a shitte-tonne of oil getting past rings to make it all the way to the connecting pipe. It had to be smoking profusely.
     
  5. Musicman333

    Musicman333 New Member

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    It was smoking a lot at first, dissipated and then started smoking on the pipes themselves. Everything above the pipes look dry but it loses oil quick toou
     
  6. Musicman333

    Musicman333 New Member

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  7. Musicman333

    Musicman333 New Member

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  8. Captain 80s

    Captain 80s Insider

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    I would think that would have to be valve guide seals to produce that much oil. But go through the motions and start eliminating the possibilities. Maybe that's why the bike was parked in the first place.

    On another topic, what exhaust is that? Could you show a pick of the connector and muffler?
     
  9. Musicman333

    Musicman333 New Member

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    Can I find replacement valve seals or are they a lost cause if that's the case? And I have no clue, no markings of any kind on the muffler 15541504108271670409806.jpg 15541504403611640802953.jpg
     
  10. Captain 80s

    Captain 80s Insider

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    That's a weird one! I've seen a lot of Interceptor systems, but I don't think I've seen that one before.

    If it turns out to be rings or those seals, prob not worth your time. Those engines are not the easiest to work on, even when the parts were readily available. And could be just the tip of the iceberg regarding other problems. I would personally run it some more and even take it for a short ride and see if it improves or gets worse.
     
  11. squirrelman#1

    squirrelman#1 New Member

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    sure, could be stuck or bad rings from sitting, which might resolve itself after some riding, as capt80's suggests.

    probably could have saved yourself trouble if you hAd asked to inspect sparkplugs b4 purchase, something any VF500 buyer should do. any hopeful rider who wants a running VF500 had best do a compression test, there in the owner's driveway, b4 hauling it away. big gamble, high odds.
     
    Last edited: Apr 1, 2019
  12. NorcalBoy

    NorcalBoy Member

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    Ya might want to explain, in a little more detail, what you mean by "bypassed" the PCV system.
     
  13. Captain 80s

    Captain 80s Insider

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    That is an excellent point. Crankcase not breathing properly?
     
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