Delkron 103" Hop Up Kit - Manual (Page 2)

Correct top compression ring and secondary compression ring end gap is equal to .004”
per inch of cylinder bore … example: 4.125” x .004” = .0165” of ring end gap. Rounding
this number to the next highest number is permissible … example: .0165” rounds to .017”
DO OT round to the next lowest number … example: .0165” to .016”. It is better to be
slightly larger with your ring end gap than smaller. Insufficient clearance on the
compression rings can lead to “Ring Abutment” at operating temperature while under
compression causing irreparable engine damage.
To achieve correct ring end gap when ring end gap is insufficient, too small, grinding of
the ring ends will be necessary. This can be done several different ways (File / Bench
Grinder / Ring Grinder / Etc.), but it is recommended that a ring grinding tool be used.
After grinding of ring be sure to deburr the ring ends prior to re-installing them into the
cylinder bore.