Topic: TEC breakerpoints, all the same or do they differ?

[Deltarider]

Have a look at the 2+3 breakerpoints in the pic. Left is the TEC 30204-300-154, which can be used on all CB Four models, the CB350F excepted. The CB350F should have 30203-333-004. In the pic on the right is the genuine TEC I once bought. On the package it said CB400F. For a momentI thought, it is that 30203-333-004, which can be applied on the CB350F and the CB400F according to CMSNL. No other CB Four models are listed! But the -004 suffix is usually ND and TEC has -154.
When you consult CMSNL, you get confused. Mine (right in the pic) is depicted nowhere.
Now in this forum it has been claimed that all -300- breakerpoints fit all CB Four models. I doubt that. I am puzzled in particular by that according to CMSNL the CB400F can have both the -300- as well as the -333-. IMO, that doesn't make sense.
Who knows more?
Maybe, there is an error by Honda. AFAIK the 30203 is meant to be the left one to serve !+4, the 30204 is for 2+3. It's odd, but it seems Honda has changed those numbers around for the CB350F/400F.
Did I miss something?

[Nurse Julie]

No error by Honda that I am aware of. It depends which back plate you are using, either the TEC or the Hitachi and even then, if I remember correctly, the Hitachi have 2 different part numbers 01 and 02.
The 400 and 750 K use the same back plate / condensers and points. Hence the 300 and 333 middle part number both being suitable.

[Stev-o]

Delta - have you seen this thread?

http://forums.sohc4.net/index.php/topic,195678.0.html

[Deltarider]

Delta - have you seen this thread?

http://forums.sohc4.net/index.php/topic,195678.0.html

\
Yes, I have.
@ Julie. It is odd that in the original CB350F and CB400F paper parts lists the first five digit number of the parts number changes places depending whether it is the -300-154 (TOYO) or -333-004 (ND) part. I have not seen this before. The first part of any partnumber always indicates what part on the bike it is about, so all CB Fours have a left (1+4) breaker 30203- and a right one (2+3) 30204- no matter what make. The CB350F and CB400F are exceptions. It's confusing and I can't see what reason Honda must have had to do this. FYI: the CB350F had only the ND -333-004 plate, the CB400F had either the Toyo -300-154 or the ND 333-004 plate. The CB350F has only the 30220-333-004 advancer, the CB400F can also have the 30220-377-154 one. CMSNL may differ here, so pay attention when you order!
I have no clue why my particular breaker is not depicted anywhere. Strange.

[HondaMan]

The 350F had its own breakerplate and points when it first came out: Honda stated thru their service reps that this was "due to the higher redline RPM of the engines". IIRC the 350F/400f versions (-333- numbers) had thicker springs on them, maybe check yours to see if that's true?

The first 350F backplates for the points did not fit on (my) 750K2 when I tried it: the slots on the lower part of the plate looked much like the slots on TEC's current backplate, with the lower slots narrower (but clocked slightly off to one direction) in width than the upper one by just enough to not let the 2-3 side point reach their timing marks (too far advanced at 0.012" minimum gap). The ones on the old 350F were like that, and on my oldest 750 versions the slots are the same widths: this changed in the 1990s 'unification' changes by Honda when lots of these parts numbers got mish-mashed together into something 'universal' instead. They were just trying to reduce part number counts so they could supply parts that would run still, because of people like us who won't quit riding their bikes...I wish Honda had also widened the lower 2 slots of the [current] TEC plates when they did this, so they would fit ALL the SOHC4 bikes like a universal part.

I've not heard of any 'points bounce' problems from weak springs when using 750 points on a 350F/400F, though.

While I am not sure [at the moment] WHERE I have them, I have an old -333- plate and one of my earliest -300- plates (I think it is Hitachi), so if I can remember how to look for them I'll try to dig them out. I kept them just for this reason, as I [more than once] tried to tune up 350F bikes with the 'other' points plates, not getting stellar results. That's why I saved these, to try to make me remember this. 

[Deltarider]

Good info!