Uploaded April 2026 | Updated September 2026, 2 weeks ago
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This 1976 Honda MT125 came in with engine noise, and before tearing into it I needed to know how serious the problem really was.
In this video I inspect the top end, check piston and cylinder condition, and pressure test the crank seals to determine whether this engine needs to be split apart or if it can be repaired externally.
This is the real diagnostic phase of a vintage 2-stroke rebuild — figuring out what’s bad, what can be saved, and what the smartest next move is.
In this video:
• Diagnosing engine rattle on a Honda MT125
• Inspecting piston and cylinder condition
• Pressure testing crank seals
• Finding a bad seal
• Determining if the engine cases need to be split
Part 1
More MT125 videos coming soon.
OLSA SLIM WRENCH SET:
amzn.to/4mREfBA
►► 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 #MotorcycleRepair
Channel memberships are a simple way to support the channel and keep this content coming. I appreciate you.
youtube.com/channel/UCmpL0CxrbzbsD6G0GE0P_DQ/join
This 1976 Honda MT125 came in with engine noise, and before tearing into it I needed to know how serious the problem really was.
In this video I inspect the top end, check piston and cylinder condition, and pressure test the crank seals to determine whether this engine needs to be split apart or if it can be repaired externally.
This is the real diagnostic phase of a vintage 2-stroke rebuild — figuring out what’s bad, what can be saved, and what the smartest next move is.
In this video:
• Diagnosing engine rattle on a Honda MT125
• Inspecting piston and cylinder condition
• Pressure testing crank seals
• Finding a bad seal
• Determining if the engine cases need to be split
Part 1
More MT125 videos coming soon.
OLSA SLIM WRENCH SET:
amzn.to/4mREfBA
►► 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 #MotorcycleRepair
