BMW E28 Pierburg 2B4 Carb Tutorial: Cleaning, Second Stage, Accelerator Pump & Cold Start Explained
Автор: BMW E28 | Classic Cars Lab
Загружено: 2025-11-21
Просмотров: 21
0:00 Intro
0:46 First stage vs second stage — what’s the difference
1:14 The vacuum diaphragm — why your second stage won’t open
2:21 Accelerator pump & the little fuel nozzle (how it works)
2:45 Cold start system — choke flap, pulldown, wax thermostat
3:08 How to adjust wax thermostat
3:48 Manifold plate - Air leakage
4:06 How to make your own gasket (download template)
Join me as I take apart and clean the legendary Pierburg 2B4 carburetor from my BMW E28! 🚗
In this video, I cover:
How the carb works (first and second stage)
Common problems and “pain points”
How to check the second stage vacuum diaphragm
Accelerator pump and the “little nozzle”
Cold start system, automatic choke, and fast idle
Why your carb gasket is critical, and how to make your own using a downloadable template
Whether you’re restoring a classic BMW, troubleshooting your carb, or just love old-school mechanical engineering, this video is for you.
💡 Download the Pierburg 2B4 gasket template here:
Don’t forget to like, subscribe, and hit the bell 🔔 for more BMW E28 maintenance tips!
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