You asked about "Primary chain" here is what we found:
Primary Chain, Triple-Row - $50.00
Race-quality three-row primary chains at an affordable price.
Primary Chain, Single-Row - $15.00
Single-row primary chains for pre-unit British bikes, Villiers engines and Bultaco Sherpa T/Alpina.
Primary Chain, Bultaco Double-Row - $45.00
Standard 52-pitch chain. Does not fit the model #192, #193, or 125cc Pursangs.
Sprocket, Crankshaft, BSA Trials - $58.00
18-tooth crankshaft sprocket for BSA unit singles provides ultra-low gear ratios for trials use, while keeping your final-drive ratios within reason. Kickstarting is also much easier. Fits all unit singles (C15, B40, B44, B25 and B50). Requires 68-pitch primary chain, available separately.
Non-Detergent 10w Oil - $14.95
Our favorite choice for British/Spanish primaries; gives great clutch action and primary-chain life. Sold in quarts.
Villiers Gasket, Gearbox-to-Crankcase - $4.50
Gasket that goes between the gearbox case and the crankcase on 9E-37A Villiers engines, typically three or more are required to achieve correct primary-chain tension. Requires minor trimming for 36-37A engines. Part #C.8898/1.
