SOHC.co.uk Forums > CB500/550
Timing Electronic Ignition?
deltarider:
Here's a pic of the TEC advancer. Note that the tiny mark in the rim (in white rectangular) should oppose the hole (dito).
PennoK3:
I'm lining it up against the second mark (5 degrees).
Murf:
I don’t think the 3 holding bolts are evenly spaced, so maybe if you rotate the pcb board and try the 3 possible positions it could fit you may find a position where the 3 bolts are at the end of the slots with the board in the fully clockwise position. This may then be the correct location for the board and you will be able to time it. Just a guess really but maybe worth a try.
K2-K6:
--- Quote from: PennoK3 on October 14, 2024, 09:09:04 PM ---I'm lining it up against the second mark (5 degrees).
--- End quote ---
It's the two little white boxes marked onto the mech picture that you need to check.
They are the orientation of the cam timing lobe that controls when it fires. It can be installed 180 degree opposite to that which is correct, then give this fault.
K2-K6:
--- Quote from: Murf on October 15, 2024, 01:29:56 AM ---I don’t think the 3 holding bolts are evenly spaced, so maybe if you rotate the pcb board and try the 3 possible positions it could fit you may find a position where the 3 bolts are at the end of the slots with the board in the fully clockwise position. This may then be the correct location for the board and you will be able to time it. Just a guess really but maybe worth a try.
--- End quote ---
The board only fits in one position so that the hole in it allows you to view the static timing mark cast into the crankcase.
If it fires (the light changes status here) on the opposite cylinder marking of rotor, then one of three things is wrong.
1) the cam rotor is fitted backwards, as noted in post above. It could already have been installed like that for points, then the two coil wires transposed to correct it on the original installation of this bike. You'd not know as it would run without problem.
2) the board is wrong in its two firing pickup being swapped from manufacturer. Unlikely, but possible.
3)the instructions are written incorrectly with regard to the light showing on or off at the cylinder 1&4 position indicated marks on rotor. Not unknown, have had a ignition product from secondary manufacturer before where they'd transposed the two wiring colours in instruction to make it incorrect, but had everyone involved scratching their head.
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