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Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

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  #21  
Old 11th August 2017
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Default Ride without foo foo valve

With wondering if the oil pressure is high because the air isn't escaping through the valve, what would be the short and long term issuesissue if I removed the valve and rode? Mostly to check if pressure is the issue?
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  #22  
Old 11th August 2017
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Default

The foo foo valve won't be giving you trouble.
You really need to determine where the leak is coming from. One of the most common places is the rocker arm shaft end caps.
Clean the bike properly. Get all the oil off.
After it's dry, start the engine and run it for no more than 3 minutes.
Blow some talcum powder all over the engine.
Any oil leaks will show themselves. Now fix the are of concern.
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  #23  
Old 15th August 2017
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Default More troubleshooting... but a possible solve...

After taking all the advice you forum-ers have given, cleaning the area, and trouble shooting, this is what I have determined:

> The leak happened while the bike was in gear, but not while running in neutral
> The leak was CLEARLY coming from the bottom of the rear intake, where the pushrod cover seats, as well as where the tachometer cable screws into the cam cover, even after replacing the o-ring (no other leaks were found).
> No air was coming out of the crankcase vent tube/foo foo valve.
> I removed the breather tube and valve, and checked it. No air would come through when I tried blowing through it.
> I took the bike for a short ride (about the duration where I would start seeing leaking) without the valve in place, and there were no leaks.
> I purchased a one way PCV valve similar to that suggested on another forum post, and I have yet to see a leak. I also saw that JP cycle sells some, also.

I wanted to say thanks for the advice so far, and if you have further suggestions/advice I'd like to hear it!
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