SOHC.co.uk Forums > CB750
Ignition timing question
Craizeehair:
Apologies for the basic questions that I’m posting.
Today was to be the day that I checked the points and set the ignition timing, for the first time. I hadn’t banked on the timing being so much of a pain!
The points are pretty much cooked and I will be ordering new ones but I cleaned them up for now, set the gaps and cracked on with the timing. This is where the fun started.
I could set the timing on 1-4 to light the bulb bang on the F mark.
If I then set the plate with one screw to check it, everything was fine, as soon as I tightened all three screws it would throw it out. This went on for about an hour, what I found was that if I tightened the top right screw on the plate at any point it went out of whack. If I tightened one of the other screws, or both of them, it was fine. As soon as the top right screw was tightened it advanced it.
Is there a knack that I don’t know about. Could the plate be dodgey, or any other issue that could cause this? I didn’t expect it to be such a pain.
Oddjob:
Possible the plate is bent, take it off and check it.
It's common when non original points are fitted to find timing 2-3 difficult, with TEC points it's a doddle but not stuff like Daichi.
Original points are very expensive and can be hard to find.
Craizeehair:
--- Quote from: Oddjob on August 20, 2023, 10:13:09 PM ---Possible the plate is bent, take it off and check it.
It's common when non original points are fitted to find timing 2-3 difficult, with TEC points it's a doddle but not stuff like Daichi.
Original points are very expensive and can be hard to find.
--- End quote ---
Thanks, I did wonder if the plate might be the problem.
I am going to order new points anyway and I’m sure the condensers are after market so had contemplated changing them for originals whilst I’m at it. DS sells the original plate with points and condensers already fitted, cheaper than buying the points and condensers separately, not cheap but I may go that way for peace of mind?
Bryanj:
If you want genuine points and condensers the only sensible way is the complete plate, comes with nice new white covered wiring as well
Martin6:
You are tightening up 1 & 4, to lock them in, before moving to 2 & 3?
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