Why 5 -10 degrees before TDC the spark plug sparks?
How to count 5-10 degrees before TDC?
Well, before I explain. Please look at the picture below and memorize slightly term components of the image below!
Position when the piston is at TDC (Top Dead Point), the position of the crank pin, piston handlebar / conecting rod and piston are in one line. This is the point of zero degrees .See image below!
Crankshaft / crankshaft continues to rotate when the engine life. At the time of the crank pin 10 degrees before it reaches the point of zero degrees (10 degrees before TDC piston), this is the time of the spark plug sparks or ignition timing can be referred to. See the picture below!
5 degrees before TMASaat crank pin 5 degrees before it reaches the point of zero degrees, this is the time of the spark plug sparks or ignition timing. See the picture below!
When ignition occurs between 5 to 10 degrees before TDC. Not all machines have the same ignition timing, depending on the specifications of the manufacturer. And there are ignition engine standards 7 degrees before TDC, or 8 degrees before TDC. So each machine has a standard ignition timing of each - each, but the way the calculation remains the same degree as the above.
