ATC70 Parts:
Please note I can not provide free shipping on these items.

Replacement Maier Plastic, Red only:
Front -- $29.25
Rear -- $85.75

Exhaust-Cobra Steel-Black finish (no head pipe)
Standard –99.76
Quiet (no spark arrestor) –120.76

Bearings and seals (78-88 models)
Front (2 bearing and 2 seals)--$21.24
Rear (2 bearing and 2 seals)--$20.72

Chain and sprockets: (73-85 models, specify year)
Specify either 36 or 35 rear tooth and 13 or 14 front tooth.
Front and Rear sprocket with chain--$ 45.00

lets see some performance Motor mod options

Sorry but that is all I am able to offer.