SOHC.co.uk Forums > CB350/400

HT Leads on coils

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royhall:
The code on the 350/4 coils is FL703-12V. Cheers.

AshimotoK0:
This is really a message for Roy. Had some fun and games and trashed a set of (faulty anyway) coils during the Ashimoto repair experiments. However, making good progress now with plan 'B' . Basically the TEC  coils are encapsulated in black thermoplastic material. The secondary coil  brass terminal inside can be got too quite easily BUT on one lead, if you try to de-solder the old HT  lead from the terminal, the heat melts the plastic, the terminal comes loose,and  the really fine wire from the secondary coil just snaps off and renders the coil useless. So I am just soldering onto the remains of the old lead.

Totally different with the Honda twins coils made by Nippon-Denso (yellowy/brown plastic body.). They are much easier to get to the internal secondary terminal because they are made from filled epoxy/ or thermoset resin which files/ grinds really easily. The HT lead conductor literally pushes into an internal pointed pin,no soldering. May solder it dunno yet. Was a bit worried that the replacement HT lead would not screw onto the metal -clad plug caps I just got from Germany but it's OK, after you create an initial hole where the conductor wire is, to start it off screwing in.

All 'TEC' coils  (four Cyl) around bit less than  5 Ohms ... Nippon-Denso's (twins) 3.8 Ohms..

Still need to find rubber sleeve 1mm or less wall thickness. I don't want to use heatshrink,  not flexible enough.
Progress and PICs to follow but on none of my coils, so far,  is there any coil failure, just HT lead fatigue where the HT lead comes out of the coil.

royhall:
That's very interesting reading Ash.

As I have them do you think the DSS coils will be okay at 2.7 ohms with points, or are they going to eat the points and condensers?

Have been thinking of fitting a Boyer instead and have noticed they do a full kit including matched coils but it's really for a 400/4. If I go electronic that's the route I shall take.

Just weighing up before I fit the other coils, if I should return them to DSS and put the money towards the Boyer kit. I remember someone fitting the 400 kit to a 350 but can't find the thread now, some difference in the advance curve if I remember correctly.

What do you think Ash.

Cheers.

Chris400F:
I think these may be the threads you are thinking of Roy.
http://www.sohc.co.uk/index.php/topic,8952.msg61112.html#msg61112
http://www.sohc.co.uk/index.php/topic,9062.msg62181.html#msg62181

AshimotoK0:
Pretty sure the same setup on 350/4 as on 400/4 Roy. Makes sense to buy everything from Boyer although standard coils should be fine I think. Points with coils less resistance than standard sounds like bad news though as your points would arc and wear more with the extra current. DS pretty good on refunds & returns.

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