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Jim's 1980 SG Restoration

Discussion in 'The Garage' started by JimD54, Sep 26, 2017.

  1. JimD54

    JimD54 Mechanic, 1968-Present.

    Yeah, was actually feelin' kinda bad for the guy. Then I got to thinking.... 'bout 6 months ago I put some Cessna airplane parts on Ebay that should have got me about 3 grand. "One" guy bid 500 and got em' :(
    What goes around comes around... :D
    Meddy and Mailman like this.
  2. Downeaster

    Downeaster Everything in XS

    Dammit, Jim! I've been saving up for a benchtop mill, but I think my cash stash just took a hit.
    Gets pretty good reviews on Amazon and if Captain OCD likes it...

    Question: Do you have an air dryer in the line and if so which one?
    Last edited: Apr 16, 2018
    JimD54 likes this.
  3. Nicely done Jim, the stand & the carbs.;)
    JimD54 likes this.
  4. JimD54

    JimD54 Mechanic, 1968-Present.

    It comes with it's own water separator/regulator and I have a separator in the basement air line.
    Thanks Mick.
  5. JimD54

    JimD54 Mechanic, 1968-Present.

    So.... I just spent the better part of two hrs. looking for the lower (long) engine mount bolt... no joy. :umm:
    Back to Home Depot to get two more 3/8" bolts.
    My beer carton cardboard template was dead on.... and the stand went on like it was made for it...;) (it was)


    Rolled it 90deg.... (still resting on the bench)


    Removed the wooden "upside down" stand and rotated another 90deg....



    Start to finish took less than two minutes and required no lifting whatsoever.:D I'm happy!!
    Um.... Gary.... don't suppose ya got an extra lower mount bolt, do ya?
  6. Mailman

    Mailman Hardly a Guru

    Very nice, I was wondering if all those nice radius corners weren’t made for rolling. Appears it was! :geek:
    robinc and JimD54 like this.
  7. 5twins

    5twins XS650 Guru

    The stock lower long bolt is actually a little long. It passes through about a good inch of frame at each end of the bolt. I also ran short of them what with all the stands I've built. I use all-thread or just plain steel rod now.
    JimD54 and robinc like this.
  8. MrBultaco

    MrBultaco 'NICKY' by bert shepard

    Damn, Jim, your engine stand looks like your engine was made for it. What a great job. Color me 'impressed' :)
    robinc and JimD54 like this.
  9. spectra

    spectra XS650 Enthusiast

    Late to the party but great stand and a smokin deal on the carbs...........

    I have a small plasma at work and love it. Has come in handy many times and sure beats a torch.......
    JimD54 likes this.
  10. JimD54

    JimD54 Mechanic, 1968-Present.

    Thanks Spectra.
    Yeah... bought my plasma 'bout 2 yrs. ago... give or take. I ain't touched my torch since.
    spectra likes this.
  11. JimD54

    JimD54 Mechanic, 1968-Present.

    Top End

    I guess it's been a while since I did an update here. I got the top end of the motor reassembled....


    I know that Robin wanted me to take lots of pics 'cause he's gonna be puttin' his back together soon. So in the process of doing that, my ocd kicked in.... and I turned the assembly into a full blown 'how to' thread. You can find it here.
    TwoManyXS1Bs, weekendrider and robinc like this.
  12. robinc

    robinc Member of the 'yellow meter gang'

    Thanks Jim! You're too much man! Awesome job.
    JimD54 likes this.
  13. JimD54

    JimD54 Mechanic, 1968-Present.

    Engine CG
    Calculating weight and balance requires two formulas....
    W X A = M. Weight times Arm equals Moment. And....
    Mt / Wt = CG. total Moment divided by total Weight equals Center of Gravity.
    The weight part is easy.. we use a scale. For this exercise we're using pounds (lbs).
    Arm is the distance the weight is measured at from the Datum..... or zero reference line. We're using inches (").
    The resulting moment is a measure of applied force.
    For instance, if you torque a bolt to 50in. lbs, you're applying a force equivalent to 1pound of weight at a distance of fifty inches. Wielding a 50in. long wrench seems a little silly, so we can use our formula to build a smaller wrench. My in.lb. wrench is about 8.5" from the center of the handle to the center of the socket. So, if we divide 50 (the applied force we want) by 8.5, we get 5.88. That means that applying 5.88lbs. of force at a distance of 8.5" from our bolt, we get an equivalent applied force (or moment) of... wait for it... 50in.lbs.
    Got that? Good... so... moving right along, we set our engine on weight scales at two different points using wood shims to keep it perfectly level.....


    The engine stand front cross tube is a convenient place... so we set that on the scale at exactly 12" from the end of the bench and use wood on the back cross tube to level the engine. Our weight here is 82.4lbs. So, 82.4lbs at 12" (W X A=M) gives us a moment of 899.9 .
    Now we move the scales to the back tube and level the front....


    Here we have a weight of 39.2lbs and our tube is 25.5" from our datum or zero reference line. Gives us a moment of 999.6
    We add our two moments for a Mt (total moment) of 1988.5 Both our weights total 121.6lbs (Wt)
    1988.5 divided by 121.6 gives us a CG of 16.35"...... So, we now know with mathematical certainty that our engine as it's currently configured (unfinished) will balance horizontally at 16.35" from the end of the bench...


    As you can see, if I suspend the engine from the aft upper mount hole, it will stay exactly as it sits.
    So... you're probably askin' yourself.... "what's this dipstick up to....?" Stay tuned.
    gggGary, Mailman and robinc like this.
  14. Beags64

    Beags64 XS650 Addict

    So I was close with my eyeball guess for my lifting hook.
    gggGary and JimD54 like this.
  15. JimD54

    JimD54 Mechanic, 1968-Present.

    robinc likes this.
  16. robinc

    robinc Member of the 'yellow meter gang'

    Probly figurin' how to hang that engine to put it back into the frame by yourself?
    gggGary and JimD54 like this.
  17. JimD54

    JimD54 Mechanic, 1968-Present.

    gggGary and robinc like this.
  18. robinc

    robinc Member of the 'yellow meter gang'

    Well.............that answered the questions I've been meaning to ask you, if you had it back in the frame and had it running yet.

    I'll have buddy come over again and grab the other end of the 3/4" pipes.....lol.

    Am interested to see how you rig things up.
    JimD54 likes this.
  19. Mailman

    Mailman Hardly a Guru

    Well that was a nice bit of applied science. I really should’ve stayed awake in math class. I usually just resort to eyeball engineering.
    I can’t wait to see your plan put into action.
    gggGary, robinc and JimD54 like this.

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