[OldDog124]

2004 S&S 124 less that 10K miles. Just started having slight drip from breather tube show up on my parking catch pan, dime size. Only the rear cylinder has the tube leading to lower frame. Does this mean I'm getting some blow-by on the rings? Seems pre-mature with the mileage. The plug doesn't look like it's oil fowled.
Any thoughts?

 

[rootintootin]

.... Only the rear cylinder has the tube leading to lower frame....

How is the front head vented? Is it set up for vacuum breathing?

Have you rehabbed everything inside the rocker boxes? It is getting close to 20 years old.

 

[OldDog124]

How do I check cyl 1 the tube stem is capped with a rubber boot. As for number 2 don’t know what rehab rocker boxes means.

 

[Alan S]

How is the front head vented? Is it set up for vacuum breathing?

S&S motors only get vented from the back head. The front head gets plugged.

I found this out the hard way.

 

[rootintootin]

There are some rubber umbrella valves to control the air/oil inside the rocker boxes, just like in Harley motors. They get old and lose their compliance.

I was looking in the owner's manual for the V124 and it says most of the 4 1/8" bore motors are set up for vacuum breathing. The rear head vents to the a/c through its own line via a one way pcv valve and the front head is plumbed directly to the intake manifold. It shows a regular HD type system with both heads plumbed together as an optional method for the rest.

510-0365-v-series-owners-manual-web.pdf (sscycle.com)

I've seen lots of those S&S motors, but I never paid much attention to that detail. I'll have to look closer the next time I see one.

 

[OldDog124]

How is the front head vented? Is it set up for vacuum breathing?

Have you rehabbed everything inside the rocker boxes? It is getting close to 20 years old.

If I’m going into the top end to do that, anything else I should be considering?

 

[Alan S]

If I’m going into the top end to do that, anything else I should be considering?

Might want to consider adding a bottom vent to go along with the rear head vent.

 

[rootintootin]

Might want to consider adding a bottom vent to go along with the rear head vent.

I found this hashed over a few years back. Is post #4 the solution you are talking about? S&S even gets involved further down.

(5) S&S 124 evo crank-case ventilation | V-Twin Forum

 

[Alan S]

I'm just telling you what worked on my S&S motor. YMMV.

 

[OldDog124]

I found this hashed over a few years back. Is post #4 the solution you are talking about? S&S even gets involved further down.

(5) S&S 124 evo crank-case ventilation | V-Twin Forum

Thanks man!!