Norton Commando Build
Sitting quietly in storage for 20+ years, this old neglected Commando will need a complete overhaul front to back.
1974 Norton Commando Roadster
Is The Bike Worth It?
The Good Stuff - The frame is good, engine and frame numbers match, it has a clear title, and it came with boxes of original parts.
Other Good Stuff - It's a low mileage bike, last registered 33 years ago. The speedometer and title show less than 10k miles.
The Bad Stuff - The front forks were badly pitted, and the only solution was to remove and replace the fork tubes.
Read: Front Fork Disassembly
Read: Front Forks Overhaul
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Cleaning Spokes
Both front and rear wheels had considerable rust built up on the rims and spokes. The heavy rust came off with steel wool.
During the front forks overhaul, the front wheel was propped up on the workbench and given a thorough cleaning.
After removing the brake rotor, each spoke and nipple was scrubbed with a scuff pad soaked in full-strength degreaser.
This was followed by rinsing with water, then back up on the workbench for a second cleaning, this time with a scuff pad soaked in half-strength degreaser, followed by rinsing with water.
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Brake Caliper Overhaul
Fifty-year-old brake calipers do not come apart without a struggle. This bike had sat for decades, and there was plenty of concern for the pistons being stuck and corroded.
Before and After Caliper Overhaul
Read: Brake Caliper Overhaul
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Other Bad Stuff - The internal exhaust threads in the cylinder head were stripped, which is not uncommon on Commandos, as the screw-in exhaust nuts often vibrate loose and damage the port threads.
So, another time-consuming repair was removing the cylinder head.
Repair or Replace Head?
I contacted Jim Comstock, a well-known Norton specialist. After looking at the pictures, he said that the fins and the exhaust threads were repairable, but he's back-logged with work for at least six months. I emailed several other places, but unfortunately, they don't have the same expertise as Jim does.
Plan "B" was to find a good replacement head. Either way, the old head had to be taken off.
Read: Norton Commando Cylinder Head Removal
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After several weeks of sending inquiries to ebay sellers and classic bike specialists, I found a good used head on ebay.
Truthfully, I paid more for it than I wanted to, but upon disassembly, found that the valve guides and seats were in very good condition. All the head needed was a good cleaning.
Cylinder Head Cleaning
In the Norton Workshop Manual, there's a section on how combustion chambers and exhaust ports accumulate carbon deposits, and caution must be given not to scratch the aluminum alloy material while cleaning Do not use steel scrapers or a screwdriver blade!
"Old School" cylinder head cleaning with degreaser, brass cleaning brushes, a little Emery cloth, and a lot of scrubbing.
Read: Clean Carbon Off Cylinder Head
This method takes longer than vapor blasting, but it's less expensive and gets the same results.
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Norton Commando Articles:
Brake Caliper Overhaul
Remove Fork Tubes
Front Fork Disassembly
Front Fork Assembly
Cylinder Head Removal
Norton Commando History
Norton Commando Upgrades
