Stihl 029 Cylinder Assembly. This is a high quality Nikasil plated aftermarket cylinder assembly with a 49mm bore made by Cross. This is a Big Bore for the 029 cylinder if you have a 46MM or a 47MM this kit will work for you and will give you more power! Includes: cylinder, piston, rings, wrist pin, cir clips. Does have hole for decompression valve. Replaces OEM Part No. 1127-020-1216.