Author Topic: kx420 piston hole  (Read 12831 times)

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Offline agt

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kx420 piston hole
« on: November 25, 2015, 02:33:28 AM »
 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.  
« Last Edit: November 25, 2015, 02:51:23 AM by agt »

Offline sandblaster

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Re: kx420 piston hole
« Reply #1 on: November 25, 2015, 03:28:36 AM »
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..

The four stroke engine: That's one stroke for producing power and three for wearing the engine out.