Scored a 71 /5.(sorta)

Discussion in 'Airheads' started by pbarmy, Nov 20, 2011.

  1. pbarmy

    pbarmy Long timer

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    Mar 5, 2009
    Oddometer:
    1,818
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    Great Black Swamp
    My buddy has had this bike in his"collection" for as long as I've known him.Lately he's been "thining" a little.We've thrown the idea of me getting it for a couple of years now.I finally picked it up yesterday.Its not really"mine" yet and he's a little sketchy about how and when it might be.(Dont worry,I wont spend anything untill I have title in hand).:dealIt quit one day while he was riding it and he started to work on it,became frustrated and parked it.Right now it has a problem and we arent sure what.You can kick it over and it feels like its turning over but the pistons dont move.We think it may be a,1 broken crank ,2 a sheared woodruff key or 3?Diagnosis will begin soon:freaky,as my buddy SOS has a keen interest in learning aieheads and I'm always looking to expand my knowledge.Here are a few pics


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    .
    #1
  2. elite-less

    elite-less Been here awhile

    Joined:
    Dec 21, 2009
    Oddometer:
    551
    Location:
    The Puget Sound Convergence Zone
    What happened when it "quit" while riding. Engine die, horrible noise, loss of power, etc…???

    Have you checked the clutch or even the clutch cable free play? Might be as simple as the clutch not engaging/disengaging properly.

    Can you properly move the engine/pistons if you rotate via the alternator bolt and allen key?
    #2
  3. Houseoffubar

    Houseoffubar fine beer sampler

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    Bothell, Washington
    That's a good call! I can only imagine it's the clutch slipping, and not turning the motor. I suspect it does not really feel like it is turning over, unless there is virtually zero compression, you would feel a distinct pop, pop, pop, as the motor comes upon compression. It would be pretty hard to get that feeling, without the motor turning. My2c
    #3
  4. Solo Lobo

    Solo Lobo airhead or nothing

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    9,241
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    Shoreline, WA
    easy diagnosis, pop off the timing inspection cover (rubber plug next to the oil dipstick), and if the flywheel isn't turning when you depress the kick start the clutch is slipping.

    Don't forget to pull the plugs when you spin it over checking if the clutch is slipping.

    Either way, It's time to pull the heads, which is a very fast and easy job.
    #4
  5. pbarmy

    pbarmy Long timer

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    Flywheel turns when kicked over.Screwdriver in the plug hole confirms pistons not moving.He said he was going up through the gears when it just quit running,didnt elaborate on what if any noise(s) it made.Got it on the lift,gonna mess with trying to turn it over from the front. If its a big engine failure,I may have a chance for getting it next to nothing,which I would then transplant the engine from my 79R/T.(Switching the top cover so it still read 750):evil
    #5
  6. Houseoffubar

    Houseoffubar fine beer sampler

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    Wow, must be sheared flywheel bolts!?! I can't imagine a crank, or BOTH RODS so broken, that they don't turn!:huh
    #6
  7. SOS

    SOS Ignorance is a gift

    Joined:
    Jan 15, 2008
    Oddometer:
    722
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    0hio
    No matter what that motor has to come out. Get Hot:lol3
    #7
  8. Houseoffubar

    Houseoffubar fine beer sampler

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    Shhhhh, I'm enjoying the mystery!:D
    #8
  9. pbarmy

    pbarmy Long timer

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    Heres a new twist.My buddy had started disassembly and lots of parts,bolts etc are still @ his house.I tried to use the alternator bolt to turn over the motor,but it was somewhat knackered.I busied myself with other disassembly.Pulled off the stator and was messin with the rotor.I grabbed it,gave it a turn and a puff of air hit me in the face from the sparkplug hole.:eek1Eureka,it spins.:clapHad my son verify with a screwdriver and a light that the pistons were indeed moving.When I move it with the rotor,the flywheel moves.BUT,when I push the kickstarter,the flywheel moves but the rotor dosen't:huhI can feel a slight"clunk"or something near the rear of the engine.Gonna pull the tranny(one of my favorite jobs:puke1)next.Stay tuned!:ear
    #9
  10. d mc gee

    d mc gee Been here awhile

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    Nov 26, 2006
    Oddometer:
    804
    Location:
    Upper Sandusky, OH
    I've got a good alternator bolt, and a ratty 2-1 exhaust, and probably the fly wheel bolts. just sayin:evil:D
    #10
  11. bmwhacker

    bmwhacker Still on 3 wheels

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    May 6, 2009
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    4,505
    Location:
    MONTANA NATIVE from NATIVE MONTANA
    :lurk...just gotta love a good mystery!:confused
    #11
  12. pbarmy

    pbarmy Long timer

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    Road trip!PBR and Yuengling for all!I can use the parts,got my John Chay rotor tool and no bolt to use.Not sure how the back flange that the flywheel attaches to is hooked to the crank,but it seems to be in that area.:confused
    #12
  13. d mc gee

    d mc gee Been here awhile

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    Nov 26, 2006
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    804
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    Upper Sandusky, OH
    Bump
    [​IMG]

    Let's get moving Mike! Show us how to polish a turd.:D
    #13
  14. pbarmy

    pbarmy Long timer

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    Waiting for my buddy to machine down a 27 mm socket so I can stop borrowing everybody elses!Need that alternator bolt too!:freaky
    #14
  15. Cam3512

    Cam3512 Cam from NJ

    Joined:
    Nov 11, 2010
    Oddometer:
    41
    Location:
    South Jersey
    So what does tha tank look like? Oh, and please keep the screwdrivers out of the cylinders!

    Cam
    #15
  16. pbarmy

    pbarmy Long timer

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    Tanks still at my buddies.And the screwdriver was just to tell the piston was moving/as I could barely turn the rotor with my hand.
    #16
  17. PaulRS

    PaulRS Dutch fool

    Joined:
    Apr 15, 2008
    Oddometer:
    830
    Location:
    Holland, land of tulips and wooden shoes
    Me too.

    Any progress here?

    Paul.
    #17
  18. pbarmy

    pbarmy Long timer

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    Well my buddy got the 27mm socket turned down for me,and the rain finally stopped so today my son and I set to removing the transmission.I had e-mailed Oak with the symptoms and he thought it could be a broken crank or a slim chance of broken flywheel bolts.We got the tranny out with little fanfare and I was able to remove the clutch assembly with out special flywheel holders or pressure plate bolts.When the pressure plate popped off,this is what we found.

    [​IMG]:huh

    I was sorta relieved as this seems to be a problem I can eventually solve with the help of friends and the Airhead community.Some good news was the tranny splines look good.

    [​IMG]

    It appears someone was in here as the pressure plate was marked /5,/6,/7.I think the next move will be stock the fridge and get a friend or two over to help pull the engine.Oh yeah,get the title from my buddy too.:deal
    #18
  19. elite-less

    elite-less Been here awhile

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    Dec 21, 2009
    Oddometer:
    551
    Location:
    The Puget Sound Convergence Zone
    Boy... that 750 must have been pumping out gobs of torque, or some gorilla overenthusiastically re-installed used bolts! :lol3

    Hope those broken tips in the crank don't give you much grief.
    #19
  20. d mc gee

    d mc gee Been here awhile

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    Nov 26, 2006
    Oddometer:
    804
    Location:
    Upper Sandusky, OH
    Weekends work better for me. I've got the clutch holder and alignment tools. Used flywheel bolts too.:D
    #20