Quadra?
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From: Radcliffe,
IA
I purchased a Byron Cap 21 from a friend that built it but never flew it. It has a gas engine that I am assuming is a Quadra engine. He could not remember the make or size as he built it 15
years ago. How do I determine if it is a Quadra and then what size it is? I don't see anything obvious on it to identify it. Thanks, Warby
years ago. How do I determine if it is a Quadra and then what size it is? I don't see anything obvious on it to identify it. Thanks, Warby
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From: Stone Mountain, GA
Old Quadras have little info on the engine itself.
On the later ones, the flywheel has a big "QUADRA Starter" label.
Most quadras have a serial number etched into the bottom. This will usually be done by hand. Mine is "42945" the "42" identifies it as a 42cc. There may be a 40xxx for the older 40cc models.
Q25,35,40,42 engines are very similar:
Cup mount
Rear exhaust
Steel can muffler.
Spark plug angled to rear of engine.
Magneto/flywheel ignition.
An almost identical engine is the US engines. These useually have a label on the side of the Cylinder.
If you can post a picture of the engine. We might identify it,
On the later ones, the flywheel has a big "QUADRA Starter" label.
Most quadras have a serial number etched into the bottom. This will usually be done by hand. Mine is "42945" the "42" identifies it as a 42cc. There may be a 40xxx for the older 40cc models.
Q25,35,40,42 engines are very similar:
Cup mount
Rear exhaust
Steel can muffler.
Spark plug angled to rear of engine.
Magneto/flywheel ignition.
An almost identical engine is the US engines. These useually have a label on the side of the Cylinder.
If you can post a picture of the engine. We might identify it,



