Motorcycle MD

Motorcycle MD Motorcycle MD exists to provide amazing professional tips and tricks for anyone who loves fixing and working on their own motorcycles.

05/21/2026

Winter project 2026. Subscribe to TheMotorcycleMD YouTube channel to see when this restoration kicks off🤫

05/09/2026

After tearing this 1976 Honda MT125 apart, replacing the bad crank seal, and rebuilding the top end, it was finally time to see if the bike would run again.

We ran into a couple carburetor and idle issues during startup, but hearing this old 2-stroke fire back up was a huge moment.

►► 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.
https://www.themotorcyclemd.com/mcmd-inner-circle-member

►► Model Specific Carburetor Teardown and Cleaning Tutorials
https://www.themotorcyclemd.com/premium-courses

►► If you need guidance on fixing, repairing or diagnosing a problem with your bike.
https://www.themotorcyclemd.com/consult-submission

Video below 👇
https://youtu.be/1o6cI0MU6ZA

05/02/2026

After hearing engine noise on this 1976 Honda MT125, it was time to dig deeper.

We pulled the cylinder, inspected the piston and cylinder walls, replaced a bad crankshaft seal, and started figuring out if this engine is worth continuing.

This is the part where you find out what you’re really dealing with.

Video below 👇
https://youtu.be/Y90BGgPbaH4

04/25/2026

This 1976 Honda MT125 came in with a rattle in the engine.

Before tearing into a vintage 2-stroke, I wanted to know exactly what was wrong — so we inspected the top end and pressure tested the crank seals to see if the engine needed to come apart.

We found one bad seal… but there’s more to this one.

Watch the video below 👇
https://youtu.be/qa6KEdmp4Mw

04/20/2026

Just needed a little grease and enthusiasm. 🤪

04/16/2026

This is why just running a wire through a fixed idle jet is not good enough.. Need to be thorough!

04/15/2026

Just wasting time over here fixing little things.

04/11/2026

In the last video, I figured out this Valkyrie was running lean.

This time, we fix it.

I go through the jetting changes, put everything back together, and verify it with a test ride and plug reading.

No guessing — just a process that works.

04/04/2026

This Valkyrie wasn’t running right. Spittng, popping and backfire at midrange so I had to figure out if it was running rich or lean.

Instead of guessing, I walked through a step-by-step process to actually pinpoint what the engine was doing and what it needs.

You can use the method of testing on practically any modern carbureted motorcycle.

What do you usually check first when a bike isn’t running right?

03/21/2026

This one had me chasing a no-start issue on a ’84 ATC 200ES…

Went through the whole starting system — switch, wiring, relay — and it ended up being something you wouldn’t catch unless you actually tore into it.

What would you check first on a no-crank issue?

P.S
If you're working through an issue like this on your own bike and getting stuck, I run a monthly live Q&A where I help diagnose problems just like this.

You can join here: https://www.themotorcyclemd.com/mcmd-inner-circle-member

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