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    Piston Change

    Which clearance do I need when changing the piston ?

    If you change your piston please notice that piston rings are all the same size … so normally you need to shorten the ring to get the right piston ring gap
    we recommend a gap of
     
    85/100 0.3mm
    125/144 0.3mm
    250/300 0.5-0.6mm
     
    an „A“ piston will have a clearance of
    0.07mm on the 85/100 – 47.87
    0.06mm on the 125/144 – 53.94 / 55.94
    0.07mm on the 250/300 – 66.33 / 71.93
     
    we recommend the 2 ring pistons for performance improvements
    85/100 (not available as 2 ring piston – use the OEM one)
    125 (OEM has a 2 ring Vertex piston 53.94 – 53.98)
    144 (OEM has a 2 ring Vertex piston)
    250 (OEM has a 2 ring Vertex piston) 
    300 (OEM has a 2 ring Vertex piston)
     
    The pictures below are for the 250/300cc to show you how to measure the piston rings and fit them. (it works the same for other bikes only the ring gap is different)
     
     

    Piston Remounting

     

    Which squish do I need to run on my 2 stroke bikes ?

    The squish is the distance between the cylinder head and the piston (messured at the cylinder sides at the postion of the piston pin)
    TM offers different cylinder gaskets, so you can adjust the squish for your personal preferences
    we recommend a squish of
     
    1mm 85/100cc
    1.2mm 125/144cc
    1.4mm 250c
    1.9mm 300cc
     
    to improve your performance you can get the VHM heads with special squish and head volumes
    those parts really work and are available in our webshop
     
    VHM has a nice video about how to measure the Squish: https://www.youtube.com/watch?v=bMDro5MFKFg
     
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