Inside Yamaha’s Blue Core: Why the Jog 125cc Engine is So Fuel Efficient

In today's video, we are tearing down a Yamaha Jog 125cc engine featuring the famous Blue Core technology. I picked up this engine "by the pound" at a local market, and it's time to see what makes these modern 125cc commuters so reliable and fuel-efficient.

What we’ll cover in this teardown:

The Blue Core Secret: Analyzing the intake port structure, tumble flow, and the hemispherical combustion chamber.

High-End Materials: A close look at the Forged Piston (rare for a 125cc!) and Yamaha's exclusive DiASil Cylinder (all-aluminum, no steel liner).

Friction Reduction: Explaining the Offset Cylinder design and how it minimizes power loss during the combustion stroke.

Component Check: Inspecting the C&U (8-rings) bearings, Mitsuboshi belt, and the oil jet cooling system.

Whether you are a mechanic, a Yamaha fan, or just curious about how Honda eSP vs. Suzuki vs. Yamaha engines compare, this deep dive is for you!

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Видео Inside Yamaha’s Blue Core: Why the Jog 125cc Engine is So Fuel Efficient канала Moto Tech