Extreme Indoor Cyclist
posted 01/31/10 11:36 PM
A visual inspection of the bores is a good start, but it is also a good idea to do some measuring. The block can look good but it's hard to see wear sometimes. Bare minimum, measure each bore top(about 0.5" from the deck), center, and bottom in four places- 12 o'clock, 3 o'clock, 6 o'clock, and 9 o'clock. You may find that that the bores are somewhat elliptical due to the greater wear on the sides from thrust load, and also more wear at the top than at the bottom. If the the bores are more than 0.0011" larger in diameter than stock (top bottom, and center) and/or more than 0.0004" out of round going 0.020" over might not be a bad idea even though boring will cost you some money, because in the end you'll have an engine that works better longer.
As far as honing goes, that can take a couple thousandths off so you may not want to go there. If the bores measure up good, you could just hit them with a flex hone and that should be fine to just freshen them up a bit without taking too much material off.
Posts: 1945 | From: Oceanside, CA | Member Since: 04/25/07 | IP: (220.127.116.11) |