Other Stuff > Desperately Seeking!!

Wanted CB 400 4 coils for an F2 1977

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Oddjob:
Oh dear, what have I started. 😀😀

As for being up early, in fact I hadn’t even gone to sleep yet, my body clock is all messed up since I got ill last year.

Ken4004:

--- Quote from: Johnny4428 on May 05, 2026, 01:13:35 PM ---That’s the same stuff I used to encapsulate new lead join, then reshape to original profile with milliput 2 part putty. Can be sanded and painted too. Yellow leads? Why not, I’ve just ordered blue but don’t even know what colour the bikes going to be yet!😳

--- End quote ---

Blue sounds nice as well again matches the stripe on the tank, well I need to make a decision, where did you get your leads from ?

Oddjob:
A slight mod I made to the Ash fix on coils was to fit a 1m circle of lead instead of fitting 2 separate leads. That means you can fix the coil in place, I fit mine backwards so that water can’t be forced down the lead opening by wind pressure, this tends to mean you need slightly longer leads but even standard lengths fit. However you can now route the leads over the top of the engine using clips on the camcover bolts to secure them and get the leads to approach the plugs from the rear instead of the front. Looks much neater, no chance of melting them on the exhaust pipes, especially if the lead is disconnected for servicing etc. Use a long straight HT cap for the inner cylinders and long right angled for the outers.

You cut the lead when your satisfied with the routing.

Ken4004:

--- Quote from: Oddjob on May 05, 2026, 04:21:01 PM ---A slight mod I made to the Ash fix on coils was to fit a 1m circle of lead instead of fitting 2 separate leads. That means you can fix the coil in place, I fit mine backwards so that water can’t be forced down the lead opening by wind pressure, this tends to mean you need slightly longer leads but even standard lengths fit. However you can now route the leads over the top of the engine using clips on the camcover bolts to secure them and get the leads to approach the plugs from the rear instead of the front. Looks much neater, no chance of melting them on the exhaust pipes, especially if the lead is disconnected for servicing etc. Use a long straight HT cap for the inner cylinders and long right angled for the outers.

You cut the lead when your satisfied with the routing.

--- End quote ---

Sorry not quite sure what you mean by 1M circle of lead , are you saying you get a loop of lead 1 metre long and solder the middle of the lead at one point at the coil as per picture attached ?  I managed to find a wiring diagram of the coil, do is this what’s inside the original coil a piece of wire the length of the coil connected in one place to the middle of this wire the the two ends connected to one of the ignition coil ht leads ( I hope you understand what I am saying)

Oddjob:
There are 2 ht leads coming out of each coil. 1-4 and 2-3 usually. Now you get a 1m length of ht lead. Do the first connection to say the number 1 lead. You’d normally measure how much of the length you’d need and cut the lead to this length with maybe a bit extra, just in case. Now you’d do the other one, number 4. Again after attaching it you’d measure and cut. The problem being if you get it wrong and you cut it too short you’re going to have to redo that lead. My idea was to do the first connection and then go right to the other end of the 1m lead and use that to connect to number 4. So you’re left with a lead going from number 1 port to number 4 port. Only after you have fitted the coil in place and routed the wires as you want them do you do the cut. One lead is always longer than the other so there is no chance of getting it wrong. Leave each lead a few inches long so you can cut and trim a little as time goes by. It wastes a little of the lead but that’s better than risking cutting too short.

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