Question about Honda CB 100 Motorcycles
Simplest way to determine this is to remove the spark plug, then remove the valve cover exposing the valve rocker arms, identify the intake valve this is done by noting its location in respect to the carburetor it should be the rocker arm closest to to the carb. After identifying the intake valve rocker arm observe it as you turn the motor over when you notice the arm moving downward the vakve is opening as it returns upward it is closing stop turing the motor over now take a drinking straw and insert it into the spark plug hole proceed to turn the motor over slowly you won't need to turn the motor over very much you will see the straw moving upward when it stops this is TDC firing stroke, if you are just using the pull start to turn over the motor you may go past TDC and have to do it over again since you do not have the ability to turn the motor back in the opposite direction, I would remove the pull start shroud so I could manually turn the motor over by hand (note always make sure you are familiar and note the rotation direction)allowing you to turn the the motor forward or backward when the straw stops moving up or down in relation to you turning the motor this is TDC take a marker and mark the flywheel and put a line mark somewhere on the engine case for future reference. There should be a factory line up mark somewhere on the engine case if there is not create your own.
Posted on Jul 24, 2009
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Posted on Jan 02, 2017
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