Blackthorne,
I have never torn apart a FXSTC. I do have a 2004 Sportster 883C that I upgraded That had a similar problem. I have pulled some real boners while wrenching (Bad Luck) and being over tired mostly. Live and learn. Experiment with in reason. Hope this helps…
You have to isolate the leak. I am sure you know that. The “I’m Guessing” leads me to ask this question.
Now a little history on my upgrade that may shed some light. I added SE Air Cleaner and Slip on pipes. 1200 jugs and 10:1 pistons. SE Cams and ignition module. Left 883 Heads and carburetor stock. Port and polish on 833 heads will come at a later time.
Runs like a bat out of hell and a lot quicker then a stock 1200. Me happy! Only problem at that time was I was leaking out of Rocker Covers. Gaskets replaced 5 times and ordered new covers. I made it a year before back one started leaking again. Going high speed for long periods it also started puking oil out the air cleaner. Time to SWAG it!
“Scientific Wild Ass Guess”. Besides I was never a believer in routing Oil vapor into the carburetor for disposal. That’s stupid..
I decided to let it breathe better in hopes of creating less pressure in Rocker boxes. I ordered an engine breather oil collector from JP Cycles part#431-335. I went to the Auto store and got some 3/8 inch hose. Back rocker box was leaking so I opened it up cleaned it up and triple checked to make sure it was true. I put in new gasket with a dab of Permatex. I will be directing tainted air into the EBOC and bypassing the carburetor. Since the Carburetor will not assist in sucking out bad air I drilled out and double the size of holes in hollow bolts connecting air cleaner backing plate to heads.
With a hose attached to each hollow bolt I routed them behind the air cleaner backing plate to a T connector. One chrome hose is seen running under the gas tank to EBOC mounted on frame right side with filter even with top of Crash Bar. The filter on EBOC has a top but is exposed on all sides. I figured Crash bar would deflect some water from going into filter on rainy rides. Fired her up and off we go.
First thing I noticed was oil temperature was cooler. I wanted to see how much oil was going into the EBOC so I did not drain it. After a week of riding some Oil started to appear on outside of filter. I drained EBOC to find 97% of it was water. It was full and oil had no place to go but out. .
Next I started to trouble shoot oil leak under the bike. I could not tell if it was from the Oil pump or Primary cover. It would only leak after high speed long hauls. Rock paper scissors the primary cover comes off for new gasket. 2 big mistakes!! I gently pulled the cover. It hung up a little I pulled harder and cover popped off. Cam gear also hit floor. &^%$. Lucky it was one gear. I had to tear into Front rocker to get cam back in. Once cover was off I noticed breather valve was not screwed in its place. It was just lying in the box. Oil Air mix was not filtered in the front.
I put cam gear back in. Closed up and put rocker box back together fastening breather valve. I had not had any problems since. I do empty the EBOC after every 4 or so cold startups to drain water out. On a side note the bike still leaked underneath. It was hose to oil pump. It loosened up enough so I saw were it was coming. I didn’t need to touch primary cover. However with that little mistake I did find the run away breather valve.
Next episode I will tell you how I was putting a fancy cap on my carburetor and my screw driver bit fell off my ratchet and hit the floor and was lost in the garage. It was not until I tried to fire up the bike that I realized it fell into my intake and into the cylinder chamber. I am learnin……..
Posted by: JCOURNEYAP on Nov 22, 06 10:44:48 pm
Oil Breather Spitting 
Linear Mode
