adams83 Posted April 9, 2010 I have a 86 cr125 and just finished break in and re blowing it up due to rushed assembly. i had it .40 over and now have to go to .60 so my question is can i enlarge the holes in the head gasket(existing 1/4 holes) that go to the radiator return to increase water flow to compensate for the extra heat around the cylinder from over sizing bore? or is there another way i can increase water flow or run cooler engine temp? Share this post Link to post Share on other sites
1987CR250R Posted April 9, 2010 The holes are sized to even out the temperature of the head, I wouldn't go about messing around with them. The first place I would look if you're trying to improve the cooling of your bike is in the radiators. On a bike that old, the radiators may be plugged solid. Maybe dropped them off at a radiator shop to have them cleaned. Share this post Link to post Share on other sites
