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Project My ZXR(s)

Discussion in 'Your 250cc Projects' started by Krompot, Jun 5, 2022.

  1. Krompot

    Krompot Well-Known Member Premium Member

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    My Bike:
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    Shipping time for new valve shims is 15 business days... No one in NZ stocks 1.70mm. need 8 of them. Put the old ones back in for now.

    With the compression test, I got 105psi across all 4 cylinders. I got the same reading when I rebuilt my MC22 engine. ~100 across all 4.

    Maybe there is a limitation with my guage setup and the small cylinder size thus not being able to produce peak psi? Or does the check valve totally eliminate this issue?

    I did calibrate the guage with the one on the air compressor, they read the same @ 120 psi.

    Cheers
     
  2. maelstrom

    maelstrom LiteTek Staff Member Premium Member 250cc Vendor Contributing Member

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    The capacity of the combustion chamber is about 5cc, so the line etc is going to make a big difference.
     
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  3. Andych

    Andych Moderator Staff Member Premium Member Contributing Member

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    Probably better to do a leakdown test to confirm where any loss of compression is going.. ring, valves etc.
    As @maelstrom says above... the 5cc is miniscule really and when you look at expansion of hose, length of hose etc it is almost amazing you are registering any pressure at all.
     
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  4. Frankster

    Frankster NFI Staff Member Premium Member Ride and Events Crew

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    Shipping time for new valve shims is 15 business days... No one in NZ stocks 1.70mm. need 8 of them. Put the old ones back in for now.

    I use this guy. http://www.precisionshims.com.au/
     
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  5. Krompot

    Krompot Well-Known Member Premium Member

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    The quote was from him.5 bucks a pop.
     
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  6. Frankster

    Frankster NFI Staff Member Premium Member Ride and Events Crew

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    $5 a pop is a bit much. Where are you getting yours from? I might have to change my supplier.
     
  7. H05TYL

    H05TYL Member Premium Member

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    It's only required for first time registration in NZ. If the bike has been registered here previously it can be re-registered regardless of not having ABS
     
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  8. Big Balls

    Big Balls Active Member Premium Member

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    Hello. Just want to clarify one thing. What year is the green bike and has it been registered in NZ then. So the rule is if it has been registered in NZ before 1st April 2020 you can revin it without having to put on ABS. Hope this helps.
     
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