I have recently acquired a 750 GT, I was told that the bike was fitted with a Rita ignition, but when I opened the top of the ignition housing I can see the ignition, but can’t find the Lucas black box, the 3 wires from the ignition housing go one to each coil and the third wire looks as if it takes power from the one of the coils. Can anyone identify the ignition from the photo. the bike sparks well, doesn’t start too easily and kicks back so it may well be that a new ignition needs to be on order. Any further suggestions apart from Sachse. the fuze box has been replaced and a different voltage regulator substituted
Looks similar to this https://store.bevelheaven.com/Electrical-Battery-Ignition/Dyna-S-Ignition-750-Sport-GT-SS/
I can't help with the ignition question but that is not a voltage regulator. Someone has put a bridge rectifier in the old rectifier/regulator casing and it is pretty roughly done too. Unless there is a voltage regulator somewhere else then there is no voltage regulation taking place and your voltage will be way, way too high at times. Could easily boil the battery and fry your ignition system.
If it sparks well but not easily and kicks back it suggests to me that the ignition timing is too advanced. The instructions @chrisw posted are for a Harley so not altogether helpful but it does suggest that the timing is set in the fully advanced position. But which cylinder is the reference? Possibly the horizontal. And @Mick-Bob is correct about the regulator.
Electronic systems - like ignition systems - will run on too high a voltage but will not run as they should and will eventually fail. Get the rectification and regulation sorted out and that might cure the ignition problem.
Thanks guys for all your help, the Dyna seems to be set fully CCW looking from the top so I might knock it back a tad, I will also be taking the tank off tomorrow and will check to see if there is a regulator in the system. If not I assume that a single phase up to 200w podtronic regulator should work?
Thanks for all your help. no regulator in the system. It’s a 3 wire alternator, 2 yellows and a red, but it’s single phase so can anyone help me as to where the red wire should go when fitting a podtronics? Coils are basic Chinese made by Wat Yong, whoever they may be, so I will replace with a set of PVLs ps what is this in the headlamp, looks like a relay but lacking wires?
My guess - and it is only a guess - is that the red wire could be a centre tap on the alternator windings. It looks like the original rectifier may have used two diodes and the centre tap rather than a four diode "bridge". Found this but haven't had a chance to study it much yet...
Thanks for the diagram, looks pretty clear. Looks as if I have a unwired headlamp relay and given that the alternator is only 150W, I might go LED
What is the red wire from the alternator connected to at the moment? Unfortunately the diagram doesn't show what the connections are inside the alternator.
Mick Currently the red wire runs to the OEM regulator box, but to a double terminal that didn’t appear to have any contacts inside the box , but looking at the wiring diagram would allow a connection to the red wire that runs from the regulator to the fuze F1 (I assume this is the main fuze that will protect the bike from a major short)
Looking at the cut and shut nature of your loom in your pic's, do yourself a favour and build a new loom. The one you've got is close to 50 years old now and wasn't that great when it was new! You could spend years chasing phantom problems with the one that you've got IME. I spent years chasing problems in the loom of my owned from new '79 900SS, but cured them all when I made my own loom around 15 years ago. Today I've been making a new loom for my '74 250 Desmo, I'm confident that it will be 100% more reliable than the old one that I threw in the bin. Steve R
