When I converted the CIS to ITB EFI, then later rebuilt the engine, I decided to leave the evaporative charcoal canister in place and to add a filter to the end of the oil breather hose that originally ran from the filler neck of the oil tank to the post air filter side of the air inlet box on the CIS.
Initially the air filter on the end of the breather hose worked fine with no oil leaks, but after 3k+ miles I started to see oil that had accumulated in the filter dripping onto the engine tin along the peak of the 4,5,6 cam tower and then on down to the lower front corner of the exhaust valve cover and I decided I needed to replace the filter with a breather tank.
After a short internet search, I chose a Moroso unit (#85475) that has an AN-16 breather inlet to match the 1 inch ID of my breather hose. I used a grinder to grind down the AN-16 threads to make the tank inlet a smooth slip fit so I could use the existing hose clamp to secure the breather hose to the tank. i also substituted a 3/8 inch pipe thread plug in place of the Moroso supplied drain valve as the install location does not have room to accommodate the drain valve.
The first step in the breather tank install was to remove the evap canister as I had decided to mount the breather can in the space occupied by the evap canister. I cut the vapor vent hose from the fuel tank and routed it to face down towards the ground in the gap between the rear shocks cross bar and the back of the cabin. I also cut out the canister purge hose that ran from the pipe fitting in the engine fan shroud to the evap canister, and I used a piece of Gorilla tape and a short length of the purge hose to plug the pipe fitting.
Breather tank mounting area:
Removed evap canister:
Plugged fan shroud hose fitting:
Next, I fabricated a mounting bracket between the inner fender well and the left mounting hole of the supplied breather tank mounting clamp; the right mounting hole of the supplied breather tank mounting clamp would be bolted to the existing evap canister mounting bracket. The fabricated mounting bracket was made from 1 1/2 inch wide, 1/8 inch thick aluminum flat bar stock cut to 3 1/2 inches in length. I made about a 20 degree break at the midpoint along the length of the mounting bracket to accommodate the angle of the inner fender. I used 1/4 inch sheet metal screws to attach the bracket to the inner fender and M6 x 20 mm bolts, washers and Nylock nuts to attach the breather tank mounting clamp to the left and right mounting brackets.
I didn't want to leave the pointed ends of the sheet metal screws in the right rear fender well, so I used a grinder to trim back and smooth the ends of the screws and hopefully prevent a catastrophic right rear tire failure.
