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2 stroke fun for 200 bucks

Discussion in '2 smokers' started by hardwaregrrl, Feb 16, 2011.

  1. Whitey1

    Whitey1 Long timer

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    This all makes a lot of sense, my only question is where does the oil go after it is used to lube the crank? When you change the crankcase oil do you leave it a little low to account for the extra oil that will be introduced to the system? Doesn't the 2t oil thin down the other oil?
    Just curious.
  2. Al Tuna

    Al Tuna NSFW

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    It is also burned in the combustion mixture and exits out the exhaust. The crank seals keep it separated from the trans oil.
  3. Whitey1

    Whitey1 Long timer

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    :thumb

    Now it makes perfect sense! Thank you.
  4. stainlesscycle

    stainlesscycle Long timer

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    2 stroke fun for 200 bucks. ironic title. no fun and no $200 :rofl

    don't worry it'll all be worth it once it's done.
  5. hardwaregrrl

    hardwaregrrl Can't shoot straight Supporter

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    Ha! I know, but at the time I thought it would just need 50 dollars worth of TLC. But it is still fun, as learning often is.:D
  6. blaine.hale

    blaine.hale Long timer

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    When it's running, we can hit the trails! I'm dropping bearings back in my transmission and crank and reassembling this weekend. So glad I don't have an oil inject unit to deal with :)
  7. vtwin

    vtwin Air cooled runnin' mon

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    How does my little Suzuki M31 two stroke get lube to the crank since it runs strictly premix? :ear
  8. PFFOG

    PFFOG Richard Alps-aholic Supporter

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    Probably not a CCI style injection.
  9. Grider Pirate

    Grider Pirate Long timer

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    The crankcase is part of the intake tract. Anything coming from the carburetor goes there first before being pumped up the transfer ports into the combustion chamber. The bearings get what they need from the oil in the fuel while it's down there. This is why two strokes of even moderate performance can't survive with bushings at the wrist pin or big end of the connecting rod. Bushings (and plain bearings) take considerable lubrication, while roller bearings (big end) and needle bearings (wrist pin end) need very little.
  10. PFFOG

    PFFOG Richard Alps-aholic Supporter

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    Not true with CCI, as the LH bearing is SHIELDED!! The air fuel mix is shrouded from the mix, and the lower end bearing is also shielded by smaller slits in the rod, than a pre-mix motor.

    Look at the diagrams or take one apart, it is very obvious that disconnecting the injection will lead to failure of the bearings.
  11. Grider Pirate

    Grider Pirate Long timer

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    Copy all. Vtwin was asking about his 'little M31' two-stroke, saying it was strictly pre-mix. If his M31 is supposed to be a CCI system, then by all means, he should be using the pump.
  12. vtwin

    vtwin Air cooled runnin' mon

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    Thanks GP. Really seems like it's just not enough oil to lube bearings in pre mix, but they've been like that for years, so I guess it works.:dunno
  13. YamaGeek

    YamaGeek Skeletor sparklemuffin.

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    It's actually more about shielding of the bearings.

    Suzuki copied SAAB's oil injection concept for the Sport, Shrike, and Monte Carlo 850 cc engines, all of which have an oil injection system that forces oil directly into the main crank bearings and the cylinder walls. To keep the oil in there from getting too diluted, they also had some extensive stamped metal shielding that covered the main bearings and crankwheels. The upside of all this complexity is that the cranks on these Suzukis are "stuffed", which in laymen's terms means that all the lower end open space is reduced to a minimum and this makes for more efficient transfer scavenging.
  14. pjhorgan

    pjhorgan Adventurer

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    Jenna,

    I had a TS185, too... my first bike. It was a '71. Then I had a string of Suzuki two-strokes after that. Learned to soup them up quite a bit... they were over-engineered and came with a 12,000 mile warranty, so you could really work on them with a die-grinder. Used to replace the head gasket with tin foil, file 5mm off the piston intake skirt, port and polish the cylinder, put on a Bassani pipe and almost double the horsepower. Of course, that wasn't too hard, since, stock, it only had 11 hp!

    Also installed "long travel " shocks from Curnutt, in California, and put preload spacers and heavier oil in the front forks. Geared way down, it was a pretty good mountain climber.

    Later, my father got one, and we souped it up some as well. Wish I still had one.

    Enjoy!
  15. bgoodsoil

    bgoodsoil Dare to be Stupid

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    so why haven't I gotten to ride this thing yet? :ddog That oil pump oughta take a half hour to install. Back to work ya bum!
  16. blaine.hale

    blaine.hale Long timer

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    Jenna, we added a 2nd Bultaco to our house hold. When are we starting a gang and tearing up urban trails?
  17. hardwaregrrl

    hardwaregrrl Can't shoot straight Supporter

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    Dammit....I knew there was something I was supposed to be doing these past few months. She runs great! I'll post pics up tonight. Having electrical issues at the moment. Need tires and the damn registration from the stoner I swiped her from...but it's all good.!:thumb
  18. jkpell

    jkpell nOOby

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    you didn't by any chance get this from a chap that lives near Newnan did you?
  19. vtwin

    vtwin Air cooled runnin' mon

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    Jenna, glad you fixed all your issues. I am going through all this with my two little Suzuki smokers. Takes for ever to start my little K11p and my M31 only really started and ran once since Jan 1st.
  20. Stagehand

    Stagehand Imperfectionist

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    Pics, my ass! :evil It didnt happen! ::fitz