Harddrive Breather Bolt - OEM 3577 — Harley-Davidson Electra Glide Classic, Electra Glide Ultra Classic, Softail Heritage Classic (1993-2001)

Harddrive breather bolt for Harley-Davidson Big Twin and Sportster V-twin engines, a direct OEM replacement for part #3577. Mounts to the breather backing plate on the crankcase to seal the breathing system.

Features

• OEM #3577 replacement
• Fits Big Twin models 1993-1999
• Fits select Sportster models 1995-2000
• Check HD parts manual for specific model fitment

Specifications

• Brand: Harddrive
• Manufacturer Part #: 19-131
• UPC: 191361165627
• Length: 6.1 in
• Width: 3.74 in
• Height: 0.78 in
• Weight: 0.1168 lbs
• Country of Origin: China (Taiwan)

Fitment

Fits Harley-Davidson Big Twin models 1993–1999 and select Sportster models 1995–2000. Verify your specific year and model against the OEM parts manual, as breather bolt fitment varies by engine revision.

Frequently Asked Questions

Will this fit my year and model?

This part fits Big Twin 1993-1999 and some Sportster 1995-2000 models. Check your HD parts manual to confirm fitment for your specific bike.

What does a breather bolt do?

It seals the breather backing plate on the crankcase, directing engine vapors into the intake to prevent oil leakage.

Is this an OEM Harley part or aftermarket?

This is a Harddrive reproduction of OEM #3577, distributed by Western Power Sports as a direct replacement.

What's the difference between this and other breather bolts?

This bolt is sized and threaded to match the factory breather backing plate on classic Big Twin and Sportster engines. Newer models use different systems.