Re: Motobecane air leak after warming up

Rebel Moby /
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If you are using any chemical 'trick' to find vacuum leaks you are wasting time and chemical but at least you will gain in frustration.

Do a proper leak down test by checking for VACUUM leaks. Block intake and exhause and draw air out from the spark plug hole with the piston at BDC. If there is any leak you will not be able to obtain a vacuum with just lung power.

(Some folks may need to ask help from someone who does not smoke or vape)

If your Moby is performing poorly only when hot, check the quality of the spark because most times that is the condenser or the antiparasite plug cap slowly dying. Spark should be blue and snappy, bright enough to be seen in just the bikes shadow and not just total darkness.

> Jeff Parr Wrote:

> -------------------------------------------------------

> How are you looking for vacuum leaks? Most use carb cleaner but that

> vaporizes on contact with anything hot and will get sucked in to the

> carb or float away, You need to use something heaver then are so that it

> falls to the ground use a propane or butane torch (unlit) the engine

> will rise in RPM or die when you hit the spot.

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