Pod Mod – What To Do With Your Crankcase Breather Hoses

People often wonder what to do with their motorcycle’s crankcase ventilation system after removing their stock carburetors and air box to install a new set of Murray’s Carbs.  Many people leave them just hanging, and some put smaller pod filters on each line, but we believe this is a great method to properly vent your crankcase moisture and compression windage. 

Step 1.  Gather your parts.  In this example we are using a 1982 Honda CB750 so you may need to measure your crankcase hoses inside diameters to visit your local parts store for the proper fittings.  In our case we are using (2) 1/2″ to 1/2″ barbed brass elbows, and the original 1/4′ to 1/2″ hose adapter that was already on the bike.  The elbows we are using are shown below.

Barbed brass fitting for Pod Mod when using Murray's performance carburetor kits.

Step 2.  Using a Dremel or and other rotary tool, slowly make a guide hole.  This hole should be smaller than the drill you will use in step 3.  Read ahead if necessary before starting.

Making pilot holes in the pod filters of Murray's Carburetor kit in order to drill a hole for our barbed fittings.

Step 3.  Now that a pilot hole is made you can finish drilling.  Make sure you use a bit that is slightly smaller than the barbed fitting you are using to ensure a snug, air tight fit.  After drilling use compressed air to get out any dust or debris from the pod filters.  You do not want to suck any debris into the motor through the carburetors after all of this work is done.

Drilling out and cleaning holes for our brass fittings to snugly fit inside Murray's Carbs pod filters.

Step 4.  Firmly press your fittings in and ensure they fit snugly to each filter.

Murray's Carbs Pod Filters fitted with 2 brass barbed fittings in order to attach the crankcase breather hoses.

Step 5.  Cut your first vent hose to size, press it on the fitting, and secure it with a clamp if necessary.

Attaching the crankcase vents to Murrays Carbs pod filters.

Step 6.  Install your first air filter onto the carburetor.

Murray's Honda CB750 Carburetor Kit with Pod Mod installed on the left side of the motorcycle.

Step 7.  Now move to the other side of the bike.  In our Honda CB750 example we are using a fitting to go from a smaller 1/4′ hose to the 1/2′ hose that will connect to the barbed fitting. If your other side is the same just duplicate the previous side and you are done. Here is a pic of the fitting you’ll need for a CB750C.  There should have been 2 already attached to the motorcycles existing ventilation system.

Stock Honda CB750 1/4" to 1/2" hose adapter for the crankcase ventilation system.

Step 8.  Connect all the hoses and use clamps if necessary.  Now your crankcase is vented properly.

Murray's Honda CB750 performance carburetor kit with the crankcase breather POD MOD installed on the right side.

*If you have any questions about this or anything else don’t hesitate to give us a call or send us an email.  Our contact info can be found on any and all of our webpages.*