- 1). Start your bike's engine and let it idle.
- 2). Spray the manifold gasket area, as well as the base of the carburetor, with penetrating oil, like WD-40.
- 3). Listen for a change in the sound of the engine as the spray hits a leak. The larger the leak, the more evident the change in sound will be.
- 4). Turn off your bike and let the engine cool down. Wash off the remaining penetrating oil.
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