Oil Sumping Evo

[lsmjamison]

Mike, is there a way to keep a 91 FXR from draining the oil bag into the cases after sitting for a couple of weeks?

I've replaced the spring and ball check to try and make it seat a little better, but I didn't prevent the bag from filling the cases.

I've heard about using a stronger spring, but not sure that's a good idea either? If that's the only cure, do you know what size or compression strength i need?

Any suggestions?

Thanks!

[Mike]

All the bikes with high mount oil tanks suffer this problem. H-D does not consider it a real problem in that the oil will be recycled back to the tank when the motor is fired. One "cure" may be a new oil pump body, but even this is not a 100% garuntee. TP Engineering offers a complete pump that is said to solve the problem. Do NOT do the stronger spring in an EV. At running temps, it can starve the motor for oil at idle (the secondary ,more common, bypass spring starves the lower end of oil at running temps, in EV's {not TC's}). The TP pump is also said to address these issues.

[lsmjamison]

Mike, you said that the bike "recycles" the oil that ends up in the crank cases, however, my crank case breather hose is ran to the air filter backing plate on an S&S carb... is there another breather routing system i should be using?

When i go to crank it over, i fill a coffee can full of oil out of the breather hose.

Thanks again!

[Mike]

That was in reference to the stock routing system, carb and air cleaner. Even these had issues "oiling the air cleaner" with the motor runinng at anything above idle, on early models. Though expensive, the TP pump sounds like the most positive solution.