BREATHER VALVE GEAR Fits Big Twin 1948-Early 1977
Breather Valve Gear Standard  
BREATHER VALVE GEAR (STANDARD SIZE) JIMS® now offers a steel replacement breather valve gear for Big Twin. Made from the finest aerospace quality steel and CNC machined to JIMS® highest standards, for precise control of exhausting crankcase pressure. Designed to replace the stock plastic breather valve gear. Also available in +.030” oversize to correct a damaged breather valve hole.
TEC # Description Size Jims #
89443 Use on Big Twin 1948-Early 1977. Standard 2338S
 

Breather Valve Gears + .030 Over Size

BREATHER VALVE GEAR +.030” OVERSIZE Made in the USA from aerospace grade steel, this is another quality JIMS® product. Oversize by +.030”, this breather is used to repair a damaged breather hole. Use JIMS® Breather Hole Reamer Tool. A damaged breather hole used to be a costly problem, now it is not. Disassembly of the engine, welding and machining are the usual procedure to repair. Use JIMS® No. 1706 tool. No special tools required, just hand tools.
TEC # Description Size Jims #
89444 Use on Big Twin 1948-Early 1977. +.030” Oversize 2338
 
 
 
 
BREATHER VALVE GEAR Fits Big Twin Late 1977-99
Breather Valve Gear with Elongated Hole  

BREATHER VALVE GEAR WITH ELONGATED OIL HOLE JIMS® now offers a steel replacement breather valve gear for Big Twins. This breather gear has an elongated rear hole to aid in better crankcase flywheel cavity vacuum. Made from the finest aerospace quality steel, and CNC machined to JIMS® highest standards. Designed to replace the stock plastic breather valve gear.

Picture to Come
TEC # Description Size Jims #
89455 Use on Big Twin Late 1977-99 single cam only. Elongated Standard 2337ST
 
Breather Valve Gear Standard  
BREATHER VALVE GEAR (STANDARD SIZE) JIMS® now offers a steel replacement breather valve gear for Big Twin. Made from the finest aero space quality steel and CNC machined to JIMS® highest standards, for precise control of exhausting crankcase pressure. Designed to replace the stock plastic breather valve gear. Also available in +.030” oversize to correct a damaged breather valve hole.
TEC # Description Size Jims #
89441 Use on Big Twin Late 1977-99 single cam only. Standard 2337S
 

Breather Valve Gears + .030 Over Size

BREATHER VALVE GEAR +.030” OVERSIZE Made in the USA from aerospace grade steel, this is another quality JIMS® product. Oversize by +.030”,this breather is used to repair a damaged breather hole. Use JIMS Breather Hole Reamer Tool. A dam-aged breather hole used to be a costly problem, now it is not. Disassembly of the engine, welding and machining was the usual procedure to repair. Now, just use JIMS® No. 1706 tool. No special tools required, just hand tools
TEC # Description Size Jims #
89442 Use on Big Twin Late 1977-99 single cam only. +.030” Oversize 2337