What causes Worn cam chain tensioner causes engine rattle on the Yamaha Xs650?

Cold start rattle, listen at top of engine Estimated fix cost: $50-$150

What causes Carburetor jets clogged from old fuel on the Yamaha Xs650?

Rough idle, hard starting, poor throttle response Estimated fix cost: $30-$100

Battery drains while riding, dim lights Estimated fix cost: $100-$300

Oil residue around engine seams and covers Estimated fix cost: $80-$200

Known issues to inspect before buying a used Yamaha Xs650. What to check and how much repairs cost.

SERIOUS

Cold start rattle, listen at top of engine

Fix cost: $50-$150

MODERATE

Rough idle, hard starting, poor throttle response

Fix cost: $30-$100

SERIOUS

Battery drains while riding, dim lights

Fix cost: $100-$300

MODERATE

Oil residue around engine seams and covers

Fix cost: $80-$200

☐Start cold, listen for top-end rattle

☐Check battery voltage at idle above 13V

☐Inspect frame and welds for cracks

☐Verify both carbs sync and idle smoothly

Tough engine, maintenance matters more than age