Uploaded May 2026 | Updated September 2026, 3 weeks ago
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After diagnosing engine noise on this 1976 Honda MT125 in the last video, it was time to go deeper.
In this video, I pull the cylinder, inspect the piston and cylinder walls, replace a bad crankshaft seal, and start evaluating whether this engine is worth continuing to rebuild.
This is the real process of working through a vintage 2-stroke — not guessing, but verifying every step before moving forward.
In this video:
• Removing the cylinder on a Honda MT125
• Inspecting piston condition
• Inspecting cylinder wear
• Replacing a crankshaft seal
• Measuring cylinder condition
• Determining if the engine is still viable
This is part 2 of the MT125 series — more to come.
►► If you want help working through problems like this on your own bike, that’s exactly what we do inside the Inner Circle during live Q&A sessions.
themotorcyclemd.com/mcmd-inner-circle-member
►► Model Specific Carburetor Teardown and Cleaning Tutorials
themotorcyclemd.com/premium-courses
►► If you need guidance on fixing, repairing or diagnosing a problem with your bike.
themotorcyclemd.com/consult-submission
#HondaMT125 #TwoStroke #EngineRebuild
Channel memberships are a simple way to support the channel and keep this content coming. I appreciate you.
youtube.com/channel/UCmpL0CxrbzbsD6G0GE0P_DQ/join
After diagnosing engine noise on this 1976 Honda MT125 in the last video, it was time to go deeper.
In this video, I pull the cylinder, inspect the piston and cylinder walls, replace a bad crankshaft seal, and start evaluating whether this engine is worth continuing to rebuild.
This is the real process of working through a vintage 2-stroke — not guessing, but verifying every step before moving forward.
In this video:
• Removing the cylinder on a Honda MT125
• Inspecting piston condition
• Inspecting cylinder wear
• Replacing a crankshaft seal
• Measuring cylinder condition
• Determining if the engine is still viable
This is part 2 of the MT125 series — more to come.
►► If you want help working through problems like this on your own bike, that’s exactly what we do inside the Inner Circle during live Q&A sessions.
themotorcyclemd.com/mcmd-inner-circle-member
►► Model Specific Carburetor Teardown and Cleaning Tutorials
themotorcyclemd.com/premium-courses
►► If you need guidance on fixing, repairing or diagnosing a problem with your bike.
themotorcyclemd.com/consult-submission
#HondaMT125 #TwoStroke #EngineRebuild
