1992 BMW R100 GSPD Oil Consumption

Discussion in 'Airheads' started by Grayghost66, May 21, 2013.

  1. supershaft

    supershaft because I can

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    My opinion has absolutely nothing to do with marketing and at the same time I don't think K+N's get me any extra power. Not that much anyway.

    I am a victim of my own experience. Being a professional BMW motorcycle mechanic, I have serviced a lot of airheads. I see the stock paper filter leaving square airboxes full of dust and dirt on a very regular basis. Many, many times over I have seen K+N filters keeping square airboxes by far the cleanest of any filter I have seen used in them. That's not marketing.

    Personally, I have about 140,000 miles experience with them. I use them because they filter better than any other filter I have seen used as evidenced by my spotless airbox and snorkels. That just does not happen with the stock paper filters. At the very least, the box and snorkels get a lot of dust with the stock filters.

    People use them at the race track for the same reason I do. They work! If something worked better, they would be using it. I mention it just because there is so much internet BS about them. And yet in the real world tons of people use them. Not just young know nothing wanna be's but long time experienced winners. That isn't because of marketing. It's because they work.
    #21
  2. Boxer Metal

    Boxer Metal Mad Scientist

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    To get this thread back on track. It is known that if you fill an Airhead to the top line it will burn off the amount yours is or more. Try filling it about 3-4mm below the full mark and see if you still have a problem.
    #22
  3. supershaft

    supershaft because I can

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    Air filters and oil consumption are on the same track.
    #23
  4. gsd4me

    gsd4me 90% bluff

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    I was at my mechanics workshop this morning to get an oil and filter change on my new 100GS. Normally we would wait until 15,000km before a filter change, but as it is a newly built up engine on an 1979 block, another filter change would not go amiss. Everything was nice and clean as it should be with two filter changes inside 5000 km (the first was done at 500 km). With a new filter, two litres only was put in the engine and after being run had settled to about a third of the way down the dip stick. We left it as it was.

    I mentioned this thread to Ray and he told me of an 1200GS that he serviced a week or so ago.

    Ray was tuning the engine but could not get it just right. He did an compression check and it was lower than it should be. Sure enough, there was an K&N filter fitted which the owner said had been in there most of the bikes life. The bike did a lot of dirt, but had less than 90,000km on it. About half the potential life of the engine was gone way before its time because of sub standard air filtration. :D
    #24
  5. supershaft

    supershaft because I can

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    Yup, they don't work without oil. That is IF the cause of the low compression was substandard air filtration. Surely Ray is like most BMW motorcycle mechanics having seen premature wear caused by ALL sorts of other causes. In my experience the number one cause would be lack of oil. You would be surprised just how many new boxers get run out of oil! With stock air filters too!
    #25
  6. Phreaky Phil

    Phreaky Phil Long timer

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    Oil consumption IMO probably valve guides. The BMW spec is like a barn door and can cause your motor to drink oil. Mine was using around 300ml per 500km and that was with new guides to BMW specs. I now run K liners with 1 thou clearance and use virtually no oil. One way to see is after a ride, shut the engine down without letting it idle long and take a carb off. If there is a little puddle of oil in the inlet below the valve then that is where the oil is going. You may be able to see a lot of carbon on the piston if you take a plug out and can shine a light in there with the piston near TDC.
    #26
  7. gsd4me

    gsd4me 90% bluff

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    Yes, he commented on how the newer boxer engines can use a lot of oil, but he has seen enough engines to know what causes certain problems and while you are entitled to your opinion, I value Rays experience and am prepared to be guided by him. For extreme conditions I would maybe add a couple of foam socks over the intake tubes just for personal peace of mind.

    As an aside; my recently departed 1100GS would use about 200ml of oil every 5000 km, certainly not enough to need topping up and that was at 181,000 km. It had had a hard life before I bought it at 56,000 km and had spent a lot of time out Birdsville way, which is desert country. It only ever had paper filters.
    #27
  8. hetkind

    hetkind Adventurer

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    I only have about 1/4 million airhead miles, on stock filters...and a quart of oil/1k miles at highway speeds in a Texas summer is just about right.

    Howard
    #28
  9. WacoDirtryder

    WacoDirtryder Been here awhile

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    Some airheads use more than others but a little over a quart in 1700 miles is not that bad in Texas but its pretty cool where he's riding.
    #29
  10. gsd4me

    gsd4me 90% bluff

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    Oil consumption depends on how they are ridden too. At the speed limit, keeping the revs down, my old R65 mono would use no oil. Getting up it at (high) highway speeds, oil consumption would increase markedly.
    #30
  11. 97oilhead

    97oilhead Been here awhile

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    I would try running 20-50 and start with the oil fill level at 2\3 full. Monitor consumption. If she drops to 1\2 full I would still monitor consumption at that level for a while.
    #31
  12. Joel1

    Joel1 Been here awhile

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    On my 89 R100GS I fill to just under the full line ( 1/8" or so ). I might be down a 1/4 quart by the next oil change ( 2500 - 3000 miles ). As far as air cleaners, I have been running a K&N since my first air filter change. Air box has always been clean inside.

    Joel

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    [​IMG]
    #32
  13. wayne

    wayne Global MotoTourer

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    Oil consumption is just fine. My 92 GSPD does about the same. Stop frettin and get out there and ride
    #33