Honda (NC35) rectifier replacement.

[Mac_Black]

Ok so since my bikes been on the road for almost two weeks it's definitely been having problems but to cut a long story short it's down to the Reg/Rec, which everyone knows are a common problem on Honda's...
After the way it was behaving yesterday I've decided I'm not running it until the unit is replaced, I don't want to end up stuck somewhere and I don't want to boil my battery either.

So this is the standard part for the NC35 https://www.davidsilverspares.co.uk/parts/part_19910/

But I've read somewhere that there are stronger alternatives, am I right in thinking CBR 600 etc?
If anyone knows of what is compatible (same connector obviously) then it would be of great help, and the best (cheapish if possible) place to find one.
Thank you

[Mac_Black]

Bumpity bump

[Blue_SV650S]

I can't say what is a direct replacement from another bike but what I can say is that I don't think that should overly matter to you ... how many wires go into the reg/Rec? do you have 5 wires - 3 alternator wires (normally white or yella) and a red and black (or whatever) +ve and -ve?

Some reg/recs have a volatge sensing wire too ... making it a 6 wire jobby.

Anyway, as long as you get a reg/rec that has the correct number of input wires - and from a similar 'demand' energy wise bike, then you should be able to wire it up. You might have to snip a few wires or crimp on some new ends somewhere.

As an example, my SV650 had a weak reg/rec unit. I'd tried other Sv ones, but they were still sh1te ... ended up getting a 07 GSXR750 reg/rec unit and using that as it was about twice teh physical size, so should cool better. I had to change the wiring on it, so it fitted the plug, but it works and has been in there for a long enough to know its a good fix!!

So ... post up a wiring diagram of the reg/rec and we should be able to sort you a reg/rec from a multitude of bikes (if you are prepared to do a bit of wire snipping).

EDIT: Actually I have a VFR/RVF manual somewhere ... I could look it up meseln, watching 'Chuck' at the mo, so will have a look after!!
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The purpose of life is to fight maturity.

[Blue_SV650S]

Ok, its a 5 wire system. 3 yella from the alternator, green for earth, red/white for +ve.

So as an example a K7 reg/rec would work for you too ... look:-

https://i489.photobucket.com/albums/rr258/killroy_14_2000/wiringdiagram.jpg (US model, but I don't think that matters for what we are looking at).

So you have your 3 'B' (black?) phases that need to go to the 3 Yellow existing phases on the current plug ... the existing Green to the reg/rec black/white. The existing red/white to the reg/rec R (red).


here is an example K7 reg/rec (I take no responsibility for this exact item, it was just an eBay search) https://cgi.ebay.co.uk/GSXR-750-K7-REGULATOR-RECTIFIER_W0QQitemZ120269373234QQ
https://cgi.ebay.co.uk/GSXR-750-K7-REGULATOR-RECTIFIER_W0QQitemZ120269373234QQ

So it will physically wire up ok, it will supply a good amount of current, it will cool better than the 35 reg/rec (overheating is normally the main factor that makes them fail) ... the only thing that you might struggle with is 'room' ... but to be fair you can re-locate the reg/reg if required/necessary ....

You could obviously do exactly the same research into late CBR rge/recs if you wanted to stick with one that might actually have a no-faffing plug ...

But what I can say is that my K7 reg/rec unit is the nuts!!
____________________
The purpose of life is to fight maturity.

[Mac_Black]

Thankyou Blue, yes I understand the causes of the rectifier failing and I know they're renowned for it, I'm not worrying about space to mount it as it sits under the seat unit on the L/H side, just to the right of the ignition coil and the rear fairing is massive.

It is in a stupid place though IMO, the bike easily gets hot enough to cook eggs on after a while sat at successive sets of lights etc and it's positioned right in the core radius of the heat with little ventilation.
I may consider moving the new rec unit up by top fairing somewhere so that it will stay nice and cool.

I'll look into the CBR recs still but thankyou for the point in the right direction.

[Blue_SV650S]

[damz]

if i remember correctly the finned regulator rectifier is the updated version which is far more reliable. should be fine getting that.
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Current Bikes RVF400 - 94
Cars: RX7 FD, Eunos Roadster
Former Bikes: FZR 250R 89, ZX7R 98

[Mac_Black]

[Blue_SV650S]

If the battery is not being charged properly or the voltages are all over the shot, this isn't going to make for a happy electrical system, so it could be just that, but to be honest, from what you describe, I think you have a broken wire or loose connection somewhere!

Have you taken the main earth off the frame to check it is 'good'??
____________________
The purpose of life is to fight maturity.

[Mac_Black]

No no the thing is that when we've tested the battery voltage it's reading just fine, albiet it's variating a little when the throttle is properly blipped but generally reading at 13.4, it's supposed to read between 13.2 ~ 13.7 or something like that (have'nt got the manual to hand).
I will check through the connections though, makes sense after all.

[Blue_SV650S]

[Mac_Black]

I've ran it total loss and it suffers from the same symptoms as usual but just worse which I took as a reinforcement of my theory.

[Blue_SV650S]

[Timmeh]

Prolly off-topic by now but the 95-98 CBR600F use the finned reg/rec which is a direct replacement on the NC35.


____________________
GSXR400 x2 | '94 RVF400 | '93 TZR125 4DL (again)
20:22:30 BLUEX5: i would love to be forced to undergo a**l plugging with different sizes
20:48:18 Temeluchus: comp you hunk of smouldering homos3x you

[Mac_Black]

Got home from work tonight and determined to get to the bottom of this I started up the bike up as normal and began to work on it outside in the dark
As expected everything cut out so I took off the rear fairing to check some of the likely connections and noticed the connectors to the main fuse were loose... tightened them up and no more problems.
I took the bike out for a hour and it's starting and running, no qualms bar the blowing exhaust.
I feel both a little embarrassed and very relieved now but the best thing is that I haven't had to spend a penny and for once I've been patient and sorted it out the sensible way, thank fuck I didn't go and order a rectifier over the past few days.

Thank you everyone for your help and advice.

[Blue_SV650S]

[craigs23]

Wouldn't bother with another Honda rectifier as a replacement - they've never been fantastic to start with - whatever the model. I even questioned as to why my dealers had checked the charging system on my 2008 CBR6RR - apparently, in some cases, they still have charging issues!

I've read on 400greybike that a few members have successfully installed an R6 rectifier, which doesn't have said issues. Hasn't been something I've looked into, but owning an NC30, which has an identical charging setup as the RVF, it might be worth a browse...

[Timmeh]

The main problem with the NC's reg/rec is its position, it doesn't get air going over it to keep it cold.

I bolted a little 12v DC fan to the fins on mine and it keeps it nice and cold, since I've never had a problem with mine.
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GSXR400 x2 | '94 RVF400 | '93 TZR125 4DL (again)
20:22:30 BLUEX5: i would love to be forced to undergo a**l plugging with different sizes
20:48:18 Temeluchus: comp you hunk of smouldering homos3x you

[Mac_Black]

I think the problem with the rec's is really obvious like you said Timmeh, although luckily this time it's been a false alarm I would still expect it might have issues in future if it hasn't been replaced already...
I will look into cooling solutions at a later point, of course it would be more ideal to place it somewhere else IMO, such as behind the front fairing.