EVO & TWIN CAM BREATHER BOLTS
Razorback Motosupply breather bolts for EVO and Twin Cam motors.
CNC machined from 6082 T6 high strength alloy and 304 Stainless Steel, these bolts offer the easiest and cleanest way to allow your crank case to vent. No more dirty air back being sent back into the intake!
Each bolt has 2 x stainless steel mesh filters and a foam filter element to oil misting and keep dirty air from being drawn back into the breathing system.
Suitable for EVO motors 93-99 Big twin and 91+ Sportsters that utilise a head breather system (1/2x13UNC) and Twin cams (3/8 x 16 UNC)
Care Instructions
The foam element on these breather bolts will need cleaning out as part of the annual service or when they become dirty and clogged. We would recommend taking the foam element out of the breather bolts once every 2000 miles and cleaning it with water and a mild detergent to ensure that your motor continues to breathe freely.
Additional information
When installing these on your motorcycle they should turn in freely by hand and only need a small tweak with a spanner/wrench to seat them fully. If they are tight when installing them, this may mean that the threads on your head could need cleaning out. Please do not force these bolts in as this may result in damaged threads or could result in a sheared bolt.
Tip : When using a spanner/socket to seat the bolt fully. Wrap the heads of the bolts in a small amount of paper roll to prevent marks on the polished surface.