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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
YZ250F (1979) Shock Oil Change
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[QUOTE="kawamaha, post: 1353438, member: 59936"] IMHO it doesn't matter if the piston is 1mm higher or lower when it is anywhere in between the top position and about 10mm below. to imagine what the piston does you can look at the drawing: www dot supercross-online dot de/Z/ scroll down to "How does the PDS System work" for example, if the rod diameter is 14mm, travel is 100mm, piston diameter is 40mm, then the piston will move approx. 12mm, thats not too much. I'm almost sure even this old shock will need 10bar / 145psi to work properly [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
YZ250F (1979) Shock Oil Change
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