This tool is used during engine assembly to safely and evenly compress piston rings before installing the piston into the cylinder. This prevents the rings from breaking and the cylinder walls from being scratched.
Features:

JIMS USA, founded 1967 in California, is a premier name in Harley-Davidson aftermarket precision. With deep roots in machining and V‑Twin racing, the brand offers everything from specialized tools and cooling systems to race-ready transmissions and complete engines. Known for U.S. manufacturing, ISO-certified quality, and racing pedigree, JIMS remains a top choice for pro mechanics, custom builders, and performance enthusiasts worldwide.
JIMS Piston Ring Compressor Set
/ pcs.