Question: 1980 Honda CB750c - What are these two used for on the engine? (Air Filter)

[akwan]

Hey guys!

So this is my first post, I finally purchased a 1980 Honda CB750c last month and today I decided to tear it down and clean up all the gunk! I am also trying to replace the original air filter with four single air filters.

When I removed the original air filter there were two tubes that connected from the engine into the air filter case. What are they used for? Since I am not putting the old filter case back in do I need to plug these holes?

Second photo is the carbs with the new air filters.

Thanks in advance!

 

[dirtdigger]

They are crank case breathers...you can not block them. You will have to fashion some sort of filter to put on them.

 

[akwan]

Good to know, I had assumed so. Thanks for the info!