Manual Old Britts - Installing the E-start starter gear train and setting up the backfire assembly

Installing the E-start Starter Gear Train & Backfire Assembly

Download the complete PDF version using the green download button at the top right of this page for full starter gear train installation details, workshop photographs and setup information.

This Old Britts technical guide covers the Norton Commando Mk3 electric start starter gear train and overload backfire assembly.

It is a useful pictorial reference for correctly assembling the crankshaft starter components, checking the sprag bearing orientation and understanding the correct gear rotation sequence.

Contents Include

• Drive sprocket installation
• Sprag bearing fitting and orientation
• Crank gear and needle bearing assembly
• Inner race and washer placement
• Starter gear rotation direction
• Small idler gear and spindle positioning
• Overload backfire device placement
• Triplex chain and tensioner setup notes
• Workshop photographs of each assembly stage
• Troubleshooting notes for worn or faulty sprag bearings

Several detailed workshop photographs are included throughout the guide, making it easier to identify component order and confirm correct starter gear train assembly before final installation.

Covered Norton Models

• Norton Commando Mk3
• Norton Commando 850 Mk3 Electric Start
• Troubleshooting notes for worn or faulty sprag bearings

A useful download for Norton Commando Mk3 owners, restorers and mechanics working on the original factory electric start system.