Starting a Cold-Blooded Motorcycle Engine

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Old motorcycle engines can be hard to start. You’ll find some old bikes have a very specific cold starting procedure.

This page will go over some of the more common starting techniques if your engine is cold or if you’ve just rebuilt the motorcycle. After that, you’re ready to break it in.

For the gasoline to ignite in the engine’s combustion chamber it needs to vaporize. It’s much harder for gas to vaporize when the engine is cold, which is why cold engine require a much richer fuel mixture than they require at normal operating temperatures.

To start, check out some of the common engine starting procedures based on the type of carburetors your motorcycles have.

Engine Starting with Enriching Circuit Carbs

To start an engine with carbs equipped with enriching circuits:

  • Turn on the fuel tap.
  • Turn on the ignition.
  • Pull out the enriching lever/plunger.
  • Leave the throttle closed and start the engine.

Engine Starting with Choked Carbs

Motorcycle Carburetor

To start an engine with a choked carburetor:

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  • Turn on the fuel tap.
  • Turn on the ignition.
  • Put the choke lever on.
  • Open the throttle slightly as you start the engine.

Engine Starting with Float Plunger Carbs

To start an engine with a float plunger:

  • Hold the plunger down until the carbs a filled with fuel.
  • Open the throttle slightly as you start the engine.

How to Clear a Flooded Motorcycle Engine

If your motorcycle engine won’t start because you’ve flooded the engine with gas, you can try to clear it by open the throttle fully as you crank the engine over. This will draw air into the engine to clear out the gas.

If it’s severely flooded, you can take out your spark plugs to try to clear it.

How to Push Start a Motorcycle

If your motorcycle doesn’t have a kick starter and the electric starter fails or the battery is low, you may need to jump start or push start it.

Learn how to push start a motorcycle here.

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