KX Riders

Maintenance & Technical => What year? Vin.# => Topic started by: agt on November 25, 2015, 02:33:28 AM

Title: kx420 piston hole
Post by: agt 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.  

Title: Re: kx420 piston hole
Post by: sandblaster 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..

(http://www.oem-cycle.com/forum/download/file.php?id=1336)