View Full Version : Triumph 650 Tiger Crankcase Breather Quest.

12-16-2009, 6:07 PM
Hello all, I just had the top end of my motor redone, new pistons, rings, valves and oil pump. When running the motor I'm getting a fair amount of oil coming out of the crankcase breather tube. When holding the tube up straight I still get a fair amount oil coming up. I ran the tube into the top of the oil bag and still get oil coming out the top. The breather port on top of the bag is not sealed where I put the breather tube, the cap for the bag is not vented. The oil bag is after mkt. from Cali Choppers, its set up for a Triumph (correct size ports and tee fitting).
Is this much oil coming out from the tube normal? Is there a break in period fro things to settle in? Is there a better way to secure the breather tube and vent the oil bag? Thanks George

12-16-2009, 6:53 PM
Sounds like you put to much oil in

12-16-2009, 6:55 PM
Sounds like you put to much oil in; just noticed! you need to have that breather to atmosphere not back to you oil tank. I run a long hose up along my seat post with a small filter.

12-16-2009, 7:58 PM
No there's not to much oil in the bag...

12-16-2009, 8:03 PM
Can you post a pict of the breather tube with the filter?

12-17-2009, 5:14 AM
Top 4 reasons for a "WET SUMP"
Crap in the oil pump not allowing the check valve ball to not seat properly
poor check valve ball
air leaks in either the crank case halves, and/or between the oil pump and crank case...
and a bonus cause:..clogged up oil tank breather,...is that what you're doing when you put the crank case breather on the tank breather?

12-31-2009, 9:07 PM

12-31-2009, 9:12 PM

01-01-2010, 8:24 PM
Although not shown in the diagram, that breather hose on many factory triumphs ran back under the rear fender, and vented directly to atmosphere. CRANKVENT is a great aftermarket breather. A PCV valve does not belong there. Also, it should not vent to your oil tank if I am understanding what you are posting. Your oil tank IS vented, but it is vented for the same reason a gas tank is vented. On a properly running oil system, you should feel a slight "puffing" of air coming from your crankcase vent hose on start up. It will dissipate (sp?) as RPM increase. Occasionally a foamy, yellowed mixture does vent there, and is usually the result of water mixing in your oil due to short, around town rides that never warm up your oil. If oil of any significant quantity is coming out there, you are probably wet sumping. You can also pull the crankcase plug on the bottom of your crankcase and measure the amount of oil that comes out. READ the manual FIRST so you pull the right plug and absolutely clean all dirt around that plug before you remove it. Hope this helps, bud.