Too much oil out of breather

[tussuck]

Hi,

I have an 86 FXR and have just completed some minor works and when I took the bike out for a shakedown run i noticed that there is a lot of oil coming out of the crankcase breather hose. Compression seems fine at 155 per cylinder. What I did was:
- custom steering damper (this cannot be the cause)
- new rear shocks from a 2010 Dyna Wide Glide (awesome ride)
- I Time Sert fixed 3 threads in the cam timing cover, but did not change anything else.

I have also changed over from a very free flowing set of pythons to a 2 into 2 Supertrapp system running 10 defuser disks and a closed end cap.

I know the exhaust is very very restrictive compared to what has been on the bike for the past 20 years, but could they cause such a change in pressure that oil starts to come out of the breather?

This was not the normal oil flow that happens when the bike sits for a month or so due to leakage down into the cam space; this is ongoing.

Any thoughts would be most appreciated.

[Derrick]

I wouldn't think any exhaust pipe would cause that. There is a small screen under that plug in the top of the cam gear case(check your manual) that you can get to by removing the plug and making sure the screen isn't clogged up. The reason this post caught my eye is my '91 has done this before and I can't say if I fixed it or not, it just stopped doing it on it's own. I did take the breather line out of the air cleaner and put one of those little filters on it.Can you tell if the oil is coming from the breather hose or out of the heads? Later models put breathers in the heads for some reason.
Wish I had a clear answer for you, surely someone on here will know more about this...

[tussuck]

Cheers,

I run the breather hose almost the same as you - a small filter and tucked in behind the rear cylinder. It certainly seems to be coming from the breather filter, so I'll pop the bolt on the tappet screen tomorrow and have a look (if it will even come off as its been a good 10 year sine I checked it)

I'll also have a good look around the heads as well to make sure its not there.

Its made a bloody mess of my new pipes!..lol sigh.

Here is a snap from after today's ride:
http://imageshack.us/photo/my-images/706/10013801.jpg/

Gosh i really really love the look of the 2:2 units!

[tussuck]

I think I have it!

The damn Indy sold me the wrong Cam Cover gasket. Click the picture below to see what I mean; i even went and checked in the James Catalog and it is so.

At least I got to the bottom of things and even managed to check the tappet oil screen as well as replace the screw with a socket head unit.

Cheers

[PanScott]

I learned something here

[Derrick]

Originally Posted by tussuck

I think I have it!

The damn Indy sold me the wrong Cam Cover gasket. Click the picture below to see what I mean; i even went and checked in the James Catalog and it is so.

At least I got to the bottom of things and even managed to check the tappet oil screen as well as replace the screw with a socket head unit.

Cheers

I'd say that would do it, good catch. At least there was nothing seriously wrong with it

[Ozoneye]

WTF I just did a cam on my 88 FXR put on a small breather and have same problem, damn aftermarket sh** gasket doesn't .So cone has to come off again. Do you know if pushrods have to be backed off or is there a sweet spot on cam to rotate motor to?

[tussuck]

LOL...Its not the gaskets fault! Its either you not ordering the correct one or the shop selling you the wrong one for your year bike....chit happens sometimes.

If you remove the ignition module and rotor cup you will see the notch on the end of the cam shaft. turn the engine over by hand until the notch is at 5 o'clock (i think its 5 or it may be 7) at this position the rollers are all on the cam heel so you can then just pull the Cam Cover off real easy.

[Malx]

Funny you should mention the cam cover gasket. I recently put together an 88" evo. 5,550 miles. It has an ev-27 cam. Bottom breather delkron cases. I have excessive oil output from the breather. Ran the hose to a collection can and breather filter. There are two cam cover gaskets. One pre 92 and 92 on up. If using the wrong gasket do you think that would be the cause of the problem.

What makes me wonder is I also have a 80" evo with the same cam and milled heads. It's a top breather and doesnt put out i/2 the amount of oil.. Any suggestions..

[Thermodyne]

Originally Posted by Ozoneye

WTF I just did a cam on my 88 FXR put on a small breather and have same problem, damn aftermarket sh** gasket doesn't .So cone has to come off again. Do you know if pushrods have to be backed off or is there a sweet spot on cam to rotate motor to?

If the cam gears are sized correctly, the cover will slide right off. Use your thumb to keep a little pressure on the cam to prevent it from pulling out.

[Thermodyne]

Originally Posted by tussuck

I think I have it!

The damn Indy sold me the wrong Cam Cover gasket. Click the picture below to see what I mean; i even went and checked in the James Catalog and it is so.

At least I got to the bottom of things and even managed to check the tappet oil screen as well as replace the screw with a socket head unit.

Cheers

I've purchased a few tired EVO's that were suffering from just that problem. Change the gasket = instant overhaul. That little casting separates the oil return from the vent.

[Malx]

If the case is a 93 and newer and the cam cover is pre 92 is there an issue with the gasket seating