Is a oil breather filter really necessary on the engine case.

Short Answer: Yes

Long Answer: You need to vent your crankcase. And to avoid messes and environmental impacts, you should filter your crankcase ventilation. The best solution is to filter the vapors, drip drain it back into the case, and connect the filtered vapor to the intake so that any missed particles can be burned in combustion.

Do you have any pictures of the set u I have dual carbs.

http://www.914world.com/bbs2/index.php?sho...=103161&hl=

Here is a good thread on the subject...I vented back to Filler neck base using CFR Can.....

Good Luck

Definitely vent! Also make sure you use the factory check-valve, it keeps the crankcase from building too much pressure, which will help prevent oil leaks.

Only when the factory injection is retained should the stock valve be left intact. We gut the PCV valve on every breather installation, but still use it as a connection point in most cases. The stock valve is a restriction to good ventilation.