What causes Worn piston and ring, low compression on the Kawasaki KX100?

Kick feel, compression test, blue smoke, hard starting Estimated fix cost: $150-$350

What causes Crank and main bearing wear on the Kawasaki KX100?

Side-to-side flywheel play, bottom-end rumble, oily plug Estimated fix cost: $400-$800

Lever feel, hard shifts, creeping at idle Estimated fix cost: $100-$250

Seal weeping, stiction, rock rear wheel sideways Estimated fix cost: $80-$300

Known issues to inspect before buying a used Kawasaki KX100. What to check and how much repairs cost.

MODERATE

Kick feel, compression test, blue smoke, hard starting

Fix cost: $150-$350

SERIOUS

Side-to-side flywheel play, bottom-end rumble, oily plug

Fix cost: $400-$800

MINOR

Lever feel, hard shifts, creeping at idle

Fix cost: $100-$250

MINOR

Seal weeping, stiction, rock rear wheel sideways

Fix cost: $80-$300

☐Compression test and inspect spark plug

☐Check flywheel side play, listen cold start

☐Inspect frame, subframe, swingarm for cracks

☐Verify air filter, coolant, chain condition

Tough bike, reliable with regular top-end maintenance