Foo foo valve

[47Harley]

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.

[ericfreeman]

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.

[Neil74]

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?

[Hopper]

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.

[Neil74]

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 Also the valve assembly part # 24633-77 but this # says superceded by # 24634-77.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.

[Hopper]

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?

[fergerburger]

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.