Yamaha MX250 Engine Rebuild

Ready to start work
Radio On
In the frame
Head and barrel removed
Engine of the bench

Clutch cover removed
Clutch centre
Removing crankcase bolts
Case splitting
Splitting the cases
Damaged gear selector
Removing the crankshaft
Inspection of the residue
Piston ring
Gear selector

Crankcase reassembly
Cases back together
Gear selection mechanism
Clutch baskets
Clutch side reassembly
Clutch side back together

Head and barrel back together
Engine back in
A running bike.

The bike started up third kick and ran, with a top-end rattle. However, nothing much under load, so something not right still, but it’s fuel or ignition rather than the engine.

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