What causes Loose bolts and vibration-shed hardware everywhere on the Apollo Rfz Racing 125 (db-x18 / X-pro Style Pit Bike)?

Axle nuts, engine mounts, sprocket bolts, handlebar clamps Estimated fix cost: $10-40

What causes Weak stock chain and cheap sprockets on the Apollo Rfz Racing 125 (db-x18 / X-pro Style Pit Bike)?

Chain slack, hooked sprocket teeth, tight spots Estimated fix cost: $30-70

Cold start, idle hang, petcock and float bowl seepage Estimated fix cost: $25-90

Fork straightness, frame welds, subframe cracks, wheel wobble Estimated fix cost: $80-300

Known issues to inspect before buying a used Apollo Rfz Racing 125 (db-x18 / X-pro Style Pit Bike). What to check and how much repairs cost.

MINOR

Axle nuts, engine mounts, sprocket bolts, handlebar clamps

Fix cost: $10-40

MINOR

Chain slack, hooked sprocket teeth, tight spots

Fix cost: $30-70

MODERATE

Cold start, idle hang, petcock and float bowl seepage

Fix cost: $25-90

SERIOUS

Fork straightness, frame welds, subframe cracks, wheel wobble

Fix cost: $80-300

☐Compression and cold start with choke

☐Spin wheels for bearing play

☐Check oil level and color

☐Inspect frame welds for cracks

Cheap and fixable; needs constant bolt-checking maintenance