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  1. #1
    mac_man_luke's Avatar
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    Air leakage while changing valve train

    Starting to change my valve train over to super tech tonight

    I noticed as soon as i put compressed air into the cylinders it sounds like a fair amount of air is leaking to exhaust @70psi

    Is this normal or do i have a valve problem?

    Gotta get a torque angle gauge before i can put the rocker shaft back in so might pick up a compression tester as well.


  2. #2
    hero's Avatar
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    u dont need to use the compressor,just tune the piston at tdc the valve wont drop in...

  3. #3
    mac_man_luke's Avatar
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    Compressed air is still going to hold the valves up just wondering if you always get leakage or if it means iv got bad valve sealing.

    IMO compressed air is better than using the piston

  4. #4
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    Quote Originally Posted by mac_man_luke View Post
    Starting to change my valve train over to super tech tonight

    I noticed as soon as i put compressed air into the cylinders it sounds like a fair amount of air is leaking to exhaust @70psi

    Is this normal or do i have a valve problem?

    Gotta get a torque angle gauge before i can put the rocker shaft back in so might pick up a compression tester as well.

    Thats normal Luke. Go for it.

    Good idea to know where your at with compression.

  5. #5
    mac_man_luke's Avatar
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    Yea, ill still pick up the compression tester assuming i can find one with the right thread.

  6. #6
    Sayers's Avatar
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    Quote Originally Posted by mac_man_luke View Post
    Compressed air is still going to hold the valves up just wondering if you always get leakage or if it means iv got bad valve sealing.

    IMO compressed air is better than using the piston
    I agree.

    Quote Originally Posted by mac_man_luke View Post
    Yea, ill still pick up the compression tester assuming i can find one with the right thread.
    Most kits come with a few adaptors.

  7. #7
    hero's Avatar
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    be careful with to much pressure will push the piston down....

  8. #8
    mac_man_luke's Avatar
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    Riva instructions say max 80psi, I'm running 70psi.

  9. #9
    szt8b7's Avatar
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    I just finished mine. At 70psi the pistons did move, I certainly hope that's not an issue. I don't see how it would be as the cam is still tied to it, everything but the rocker assembly moved as a unit. I had two intake valves that wanted to drop with the spring as it was compressed. I put a couple drops of penetrating oil on top of the keepers and tapped around the edge of the keeper with a brass drift. This freed them up. One exhaust valve seemed to be leaking so I sqirted a little oil around the valve guide and compressed and released the spring a few times with the air line unhooked, after that it sealed OK. I don't know how that helped, but it did. I haven't ridden yet this year so maybe the valve seat was just dry and allowed air to escape?

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