FROM BIG DOG MOTORCYCLES...........
NEW S&S CYCLE COMPRESSION RELEASE HOLE PLUG- SET OF 2. PART# 90-4916.
HH PLUG KIT 14MM . INCLUDES (2) 50-7094 AND (2) 90-4916-A.
1.25 THREAD PITCH
Designed to be used in S&S cylinder heads for Twin Cam, 4 bore Evolution big twin, and Super Sidewinder Plus style S&S engines
Consists of a small valve that opens during starting and allows a portion of the cylinder pressure to escape into the exhaust port of the cylinder head
Reduced cylinder pressure makes it easier for the starter to turn the engine When the engine starts, the valve closes and the engine runs normally, with full compression
Overview of S&S Cycle Compression Release Hole Plug - 90-4916
- S&S compression release hole plug
- If cylinder heads are machined for S&S compression releases, but compression releases are not used, this special plug must be installed to seal the machined hole
NOTE: Two required
NOTE: Fits Big Twin 07-15 Not using S&S heads - not for use on OEM heads