View Full Version : Ironhead Foo foo valve
1st June 2010, 03:25
Can anyone post pics and dimensions of the inside and out of one of these valves? Having a hard time tracking one down and thinking it would be easiest to turn one up on the lathe.
1st June 2010, 03:28
The thread size both in the cam cover for the valve and in the valve for the drain tube are 5/8-11. I can measure my spare valve this evening to give you the thread size between the body sections. I made up a plug for the drain size and tapped it for 1/8" pipe thread to allow a 45 degree pipe-to-hose barb fitting to be installed. This gave me greater clearance between my valve exit and the front exhaust pipe. I fitted a length of hose to the barb and ran it back under the motor to near the swingarm where it can exhaust the crankcase vapors.
1st June 2010, 04:00
Thanks Eric, thats my son,47Harley with the valve problem do you know if the actual valve is the same as the one used on the earlier machines?
1st June 2010, 04:17
Pre-77 did not have a foo foo valve. They used the timed breather on the oil pump shaft instead. The actual valve is a small disk with a spring-loaded fiber disc on the back of it.
It is unique to the 77 and 78 models only. Later models had a valve inside the cases. But dont know if it is the same part or not.
Iron Mick has owned both so may know.
1st June 2010, 05:08
Thanks I've done a parts search and I've found the breather valve part #24634-77. Also the valve assembly part # 24633-77 but this # says superceded by # 24634-77. Is the part # 24633-77 the part that screws into the cam cover? The 76 and under machines had a breather valve in the primary case between the engine and trans. was wondering if this was same.
1st June 2010, 05:45
Dont think the oil-transfer valve on earlier models is the same. Otherwise Harley would usually keep the same part number. The -77 suffixes indicate these parts first used in 77.
My parts book shows only #24634-77, which is the whole assembly that screws into the timing cover and the old-style vent pipe screws into the other end.
Have you tried Fog Hollow or Sporty Specialties?
1st June 2010, 06:42
you want 24633-77
I just found one of the at Al Muth Harley in Black River Falls Wisconsin. 13 bucks.
It just a reed valve and I was going to make one using aluminum bar stock and a .010 stainless flapper for the reed valve. Since I found one for 13 bucks I bought it.
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