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Nicetie, I also found the initial BTC timing set at 40 degrees and questioned whether that was correct. The factory said for this particular EI it was.
The way these ignition modules work (EI) is they do not advance at all. They RETARD the spark by about 26 degrees (depending upon the particular EI) when you first flip and start the engine.
Therefore you set the BTC timing at where you want it for when the engine is running max RPM. When you start the engine the EI retards the timing so you can idle the engine down and it will be smooth due to the retarded timing which will be the initial BTC setting minus the degrees retard of the EI which is usually 2 -6 degress..
As you advance the throttle, the EI retards the timing less and less as the RPM increases until the timing is back to the initial BTC timing.
Some EI's retard the timing more than others so you have to set the initial timing accordingly to get the BTC you want or that gives to max RPM.
Hope this clarifys the timing issue.
Trike |
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Trike,
It's the same thing. Retarding from high RPM to idle is the same as advancing from
idle to high RPM.
HOWEVER there is still something VERY wrong here. If the engine
has to be running to retard the spark for idle, where is it set when it fires the very
first time (while your fingers are turning it through compression?) 40 deg BTDC? OUCH!
Ken