Short Circuit 27 #1 Posted June 6, 2016 (edited) Hello all, I purchased an old Wheel Horse with a K321 that was used heavily for tilling for many years. When I bought the tractor, it had a knock above idle speed, so I decided to rebuild it. When I took the head off I found it already was at .030" oversize piston with lots of clearance. After removing the rod, it was a .010" undersize rod journal. I know .040" oversize pistons are available, as well as .020" rods. Has anyone had their engine bored to .040" and worked OK? Edited June 6, 2016 by Short Circuit Share this post Link to post Share on other sites
rmaynard 14,888 #2 Posted June 6, 2016 There shouldn't be a problem. Or you could have it sleeved. 2 Share this post Link to post Share on other sites
JAinVA 4,619 #3 Posted June 6, 2016 (edited) Short Circuit, Bob is spot on..040 over should not be a problem. .020 on the crank is no problem.The block could be sleeved but you can get a standard bore block relatively cheap(compared to sleeves) on E-bay.Joes outdoor power equipment normally has some listed there He is a member here and is a great source for used parts.Luck,JAinVa Edited June 6, 2016 by JAinVA 2 Share this post Link to post Share on other sites
Short Circuit 27 #4 Posted June 6, 2016 Thanks for your replies guys. I feel much better about pursuing this rebuild. Many thanks! Share this post Link to post Share on other sites
