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HELP, Can’t Torque down PMA flywheel

Discussion in 'The Garage' started by Tiger1827, Feb 10, 2019.

  1. Tiger1827

    Tiger1827 XS650 New Member

    I’m Installing a PMA on my 79 XS650 , when I try to torque down the flywheel it just turns over the motor and I can’t get it to tighten up, what can I do to keep it from moving , thanks
  2. grizld1

    grizld1 Grumpy old man Top Contributor

    There are lots of ways to skin that cat, but the one I find easiest is to put the tranny in gear and jam a thick rag or piece of leather between chain and sprocket.
    X77S, Tiger1827 and gggGary like this.
  3. jussumguy

    jussumguy XS650 Addict

    I just tightened mine by sticking a screwdriver through it and bracing it against the case
    X77S and Tiger1827 like this.
  4. timbeck

    timbeck XS650 Junkie XS650.com Supporter

    A few feet of rope that will fit into the spark plug hole when the piston is coming up on the compression stroke will do the trick...
    Tiger1827 likes this.
  5. Tiger1827

    Tiger1827 XS650 New Member

    Thanks guys for the ideas , I got a strap wrench from habor freight , and got it to torque down , thanks again
  6. XSLeo

    XSLeo XS650 Guru Top Contributor

    I have an air impact wrench. It has several torque settings. I start with the lightest, hold the Flywheel with one hand and tighten it with the impact. If that doesn't seem tight enough I move the setting up one, hit it again.
    At some point it will be about right.
    If I want an exact torque then I put the bike in gear, Hold the brake with one foot then use a torque wrench. If I can't hold the brake that way I can use a 2x4 cut off in a wedge shape, push the rear brake pedal down and either jam it down with the wedge.
    The same procedure works for the front sprocket too.
  7. fredintoon

    fredintoon Fred Hill, S'toon. Top Contributor

    Hi Tiger,
    the good news, you got it tightened.
    The bad news, you drank the XS650 version of Jonestown Koolade and you are stuck with a PMA
    grizld1 likes this.
  8. 5twins

    5twins XS650 Guru Top Contributor

    Yes, you'll probably get lots of practice taking it on and off, lol.
  9. xjwmx

    xjwmx XS650 Guru Top Contributor

    ^True that, or at least taking it off.
    Sticking a rag in the sprocket works but try to make it the rear, else it can force the chain down into the rubber on the shifter guard and cut it. With non-spoke wheels you can lay something through the wheel and let it sit against the swing arm to block everything.
    Superjet likes this.

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