SOHC.co.uk Forums > CB750
Ignition timing question
Trigger:
The original 70's points plate for a 750 was Hitachi and was marked by the Hitachi logo and had ND points and condensers
Bryanj:
To check the shaft remove points plate, which means undoing the 6mm thread nut, remove the advancer unit and spin the engine, bad ones are visibly bent but you may have to fit a wire pointer to see slightly bent, or a dti if you have one.
The shaft screws into the crank with an O ring to seal oil
Oddjob:
--- Quote from: Trigger on August 21, 2023, 06:57:57 AM ---The original 70's points plate for a 750 was Hitachi and was marked by the Hitachi logo and had ND points and condensers
--- End quote ---
As you can no longer find that part number, 30200-300-005, and even IF you could DS would be charging a fortune for it as it would be labelled "Sandcast" and we all know that doubles the price of it. So for all intents and purposes it's the TEC version that he requires, unfortunately DS has a nasty habit of not updating his pics, so he shows what they should look like and then sends something else. The replacement plate is made by Daichi and when you search for the part number of the plate 30200-300-154 that's what you normally get offered. Unless you know, you're liable to buy it thinking it's genuine. Then you find out it isn't, as it's a bitch to get timed up.
Forewarned is forearmed as they say.
Craizeehair:
Thanks chaps, I got a bit too previous last night and jumped straight on DS and ordered before the above comments. I will wait and see what turns up. They can always go back if they’re not right.
On the off chance, does anyone know where I would be able to get the TEC version if needed?
Oddjob:
Let's just hope they are still selling the TEC version. It's not impossible to find the right one, it's just a matter of looking. TBH, just finding the backplate shouldn't be hard, should be loads of those around. DS still has genuine TEC points but £30 each is a joke. So, worse case scenario, you find a second hand backplate and swap your existing points et over to them and see if that works. I'd also check there is nothing on the casing where the plate sits, like a blob of paint for instance.
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