What causes Worn piston rings, low compression on the Jawa 350 Standard?

Do compression test, listen for rattling at idle Estimated fix cost: $80-$150

What causes Leaking two-stroke oil seals on the Jawa 350 Standard?

Inspect crankcase and exhaust for oil residue Estimated fix cost: $40-$100

Test cold start, check for hesitation and rough idle Estimated fix cost: $20-$50

Test all lights, horn, and ignition coil output Estimated fix cost: $30-$80

Known issues to inspect before buying a used Jawa 350 Standard. What to check and how much repairs cost.

SERIOUS

Do compression test, listen for rattling at idle

Fix cost: $80-$150

MODERATE

Inspect crankcase and exhaust for oil residue

Fix cost: $40-$100

MINOR

Test cold start, check for hesitation and rough idle

Fix cost: $20-$50

MODERATE

Test all lights, horn, and ignition coil output

Fix cost: $30-$80

☐Run engine cold, check startup behaviour

☐Inspect frame welds for cracks or repairs

☐Check gearbox shifts smoothly through all gears

☐Verify exhaust colour — blue smoke means engine wear

Decent if maintained, parts availability can be difficult