Shop Aerco belt drives, big-bore and piston kits, clutch conversions, speedometer cables, and service parts for classic Triumph, Norton, and BSA motorcycles. Check each listing for model, year, and part-number details before ordering.
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Aerco Performance & Service Parts for Classic British Motorcycles
The Bonneville Shop stocks Aerco parts for selected Triumph, Norton, and BSA motorcycles. The range covers belt-drive components, big-bore and piston kits, a 7-plate clutch conversion, speedometer cables, and a steering-head bearing kit. Listings identify the intended model, engine, and part-number references. Several are marked UK made.
Belt Drives & Pulleys
Our belt-drive selection includes:
- A Norton 750/850 Commando primary belt drive kit.
- Replacement pulleys for Triumph 650 unit-construction models and the 750 TR7/T140.
- A 25mm Megapower2 replacement drive belt for the Triumph 650.
Pulleys and belts are sold as separate items, so confirm which components your conversion needs. Match the listing to your engine and primary-drive arrangement.
Big-Bore & Piston Kits
For Triumph 650 and 750 engines, we list a 9-stud Morgo/Routt-type big-bore kit (1963–72) and a 76mm big-bore replacement piston set supplied with Grant piston rings. We also carry a BSA A65 piston ring set. Check bore size, stud configuration, and engine year before ordering. A big-bore kit may call for other engine work, so follow the fitting instructions.
Clutch Conversion
The 7-plate clutch conversion is listed for Triumph 500, 650, and 750 applications. It is an upgrade to the clutch, not a like-for-like replacement part, so read the listing for what is included and what your engine needs.
Speedometer Cables
We list UK-made speedometer cables in different lengths for Triumph, Norton, and BSA models, including 5 ft 3 in, 5 ft 6 in, 5 ft 9 in, and 66-inch versions. Measure your existing cable and compare part-number references before ordering.
Steering Head Bearings
A taper-roller steering-head bearing kit is listed for Triumph 500 and 650 twins. Confirm your frame and model year against the listing.
Choosing the Right Part
Compare these details with your motorcycle before ordering:
- Part-number references.
- Model and year.
- Engine size.
- Front, rear, or primary-drive position.
- Cable length.
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