It's me again...
First start-up of my rebuilt engine the other day, then moved the dizzy to the position where it ran sweetest - which happened to be at the clockwise extremity of the adjustment. With the objective of setting the timing properly, today I dug out the following from an old thread on the Forum -
STATIC IGNITION TIMING
Use a voltmeter or 12V bulb not exceeding 6W wired between the ignition
coil negative terminal and earth (see illustration 4). Turn engine and align
timing marks making sure the rotor tip is pointing to the HT pick-up
segment in the distributor cap of the recommended firing plug, normally No
1
With distributor cap removed the leading edge of the chopper blade should
be 2/3rds across the lensed units in the direction of rotation. Slacken
distributor clamp bolt and very slightly turn distributor in direction of rotor
rotation This is just enough to bring the chopper blade before the point of
passing between the lensed units. Switch on ignition taking care not to
crank the engine
Very gently return the distributor against the direction of rotation to the exact point that the voltmeter reads around 12V or the test
bulb lights If you overshoot return far enough to start again otherwise you will time on backlash. When correct, tighten clamp,
remove voltmeter/bulb, replace cap and the engine will be ready for starting. It should be noted that the coil is switched off (spark
occurs) when the leading edge of the chopper blade is 2/3rds through the lensed units
With the timing mark at 12deg BTDC, and rotor pointing to HT pickup #2, I am not quite able to achieve the position where I see12V on the meter as per above. If I take the dizzy fixing bolts completely out, I am able to move it just a little more and achieve the 12V reading. I thought I needed to move the distributor by 1 x tooth on the drive gear, but if I do this, of course the rotor arm ends up pointing in the wrong direction.
I feel like I'm missing something fundamental - would be grateful for any advice. Thanks - Dave.
IMG_4793.jpg
First start-up of my rebuilt engine the other day, then moved the dizzy to the position where it ran sweetest - which happened to be at the clockwise extremity of the adjustment. With the objective of setting the timing properly, today I dug out the following from an old thread on the Forum -
STATIC IGNITION TIMING
Use a voltmeter or 12V bulb not exceeding 6W wired between the ignition
coil negative terminal and earth (see illustration 4). Turn engine and align
timing marks making sure the rotor tip is pointing to the HT pick-up
segment in the distributor cap of the recommended firing plug, normally No
1
With distributor cap removed the leading edge of the chopper blade should
be 2/3rds across the lensed units in the direction of rotation. Slacken
distributor clamp bolt and very slightly turn distributor in direction of rotor
rotation This is just enough to bring the chopper blade before the point of
passing between the lensed units. Switch on ignition taking care not to
crank the engine
Very gently return the distributor against the direction of rotation to the exact point that the voltmeter reads around 12V or the test
bulb lights If you overshoot return far enough to start again otherwise you will time on backlash. When correct, tighten clamp,
remove voltmeter/bulb, replace cap and the engine will be ready for starting. It should be noted that the coil is switched off (spark
occurs) when the leading edge of the chopper blade is 2/3rds through the lensed units
With the timing mark at 12deg BTDC, and rotor pointing to HT pickup #2, I am not quite able to achieve the position where I see12V on the meter as per above. If I take the dizzy fixing bolts completely out, I am able to move it just a little more and achieve the 12V reading. I thought I needed to move the distributor by 1 x tooth on the drive gear, but if I do this, of course the rotor arm ends up pointing in the wrong direction.
I feel like I'm missing something fundamental - would be grateful for any advice. Thanks - Dave.
IMG_4793.jpg
Comment