It's a 1977 mercury in line 6 cylinder.
I replaced a new CDI trigger for the old dead one. It runs good and idle no gear @1000rpm in water tank. Idle in forward gear @600-800rpm in water tank.
But after the replacement, when I tried to relink and resync, I found out that I have to reset the primary pick-up. It is quite some relocation 5-10 degree clockwise, not only primary pick-up, but also second pick-up, max spark position, and idle too.
My question is:
1. What is the reason for this? I am sure the procedure is right for both the old one and the new CDI replacement. The primary pick up is 5 deg, and the max spark is 21 deg. The hardware, which is pick up triangle part, is at the same location of both the trigger. Is that because of the trigger mechanism changed? or because the magnetic point at the new triangle is located differently?
2. Dose this change affect the spark arc transfer inside the distributor house? I am saying this, because the whole house has to be set 5-10 degrees clockwise. The rotor point may miss the pointers of the distributor. And the idle screw has to screw in a lot (almost to its limit) to set the idle limit position. The idle screw and the block bar has a sharp degree contact, which I am afraid is not efficient.
I replaced a new CDI trigger for the old dead one. It runs good and idle no gear @1000rpm in water tank. Idle in forward gear @600-800rpm in water tank.
But after the replacement, when I tried to relink and resync, I found out that I have to reset the primary pick-up. It is quite some relocation 5-10 degree clockwise, not only primary pick-up, but also second pick-up, max spark position, and idle too.
My question is:
1. What is the reason for this? I am sure the procedure is right for both the old one and the new CDI replacement. The primary pick up is 5 deg, and the max spark is 21 deg. The hardware, which is pick up triangle part, is at the same location of both the trigger. Is that because of the trigger mechanism changed? or because the magnetic point at the new triangle is located differently?
2. Dose this change affect the spark arc transfer inside the distributor house? I am saying this, because the whole house has to be set 5-10 degrees clockwise. The rotor point may miss the pointers of the distributor. And the idle screw has to screw in a lot (almost to its limit) to set the idle limit position. The idle screw and the block bar has a sharp degree contact, which I am afraid is not efficient.