Below are some of the general breather
categories to get you into the right area.
 

CRANK CASE BREATHERS:
Pre 93 EVO | Pre 91 XL || Crank Case  |  Early XL | Cam Cover 

NOTE: If both head & crank case breathers are available, we recommend blocking off the head breathers & using ONLY the CC breather. We do this on ALL engines, including 145 ci with great results!
 

HEAD BREATHERS:
EVO & XL | Twin Cam | Screaming Eagle | Other Aftermarket
 
NOTE: Some aftermarket filter/breather kits vent the heads into the venturi air stream. This can cause large carbon deposits on pistons, fouled plugs & can increase cylinder wear. We can usually work around these designs to vent the engine to eliminate these problems.