Maintenance & Technical > What year? Vin.#

kx420 piston hole

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agt:
 Hi, Am rebuilding a 1980 A1 and after a long search have found a wiseco  piston kit and have had it sleeved, my question is the original piston had a whole on the intake side and the wiseco has not. Is it necessary? thanks in advance.  

sandblaster:
It isn't required.
However, the hole does help with lubricating and cooling the wrist pin bearing and the under part of the dome.
For the KX500 it also is suppose to provide a tiny bit more HP.
If your piston does not have holes for the wrist pin lubrication I would put some there..

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