Hey all,

Just a quick question which I should know. Is the only ground on the NC30 from the -ve battery terminal to the frame or is there another? I asked a breaker to send me the ground lead for an NC30 and ended up getting 2 in the packet. The shorter one if definitely the battery > frame lead.

Anyone know where there other should go if at all?

Thanks
Luke

You can add them for various places - I have one from each coil and one from the starter as well.

Just pop another somewhere you fancy...

The main earth lead is like you said.

There are several other earthing points that are part of the wiring loom and should be checked for corrosion / cleaned when a dodgey ground is in order.

Rick O sells a grounding kit that might help should you have poor grounds.

It became popular modification in Japan a few years ago as the stock wiring loom is built to a budget and over time the wires corrode and connectiosn can become poorer.

Won't help in everycase but cheaper than a new loom and certainly shouldn't cause any harm

On many/most Bikes, the Engine has an Earthing lead connected to the Frame.

The battery earth connection goes to the left rear of the frame, the main harness earth connection is to the front left engine mount, pretty much everything else earths back through the harness to that point. If they sent you another, longer large diameter cable as well it`s maybe the starter lead...?

My kit uses heavy copper cables to connect the battery earth lead directly to the harness earthing tag and also to the starter casing and the ignition coil mounting bolts.

Rick

Why, what is the rational for the additional 'earth' wires.

That`s something which has been debated to death on all sorts of car & bike forums - in theory everything earths just fine through the chassis so why...?

My rationale is a strictly empirical one - it works. For example, you`ll all know what a trial NCs can be to start after not being used for a while - I can leave mine standing in an unheated garage at close to zero temperatures for a couple of months and when I go to fire it up it will chime straight in on 4 cylinders at the first or second press of the button.

I only build custom wiring harnesses occasionally but when I do, I always now build a heavy duty earth return loop into the loom.

Rick

magg wrote:Why, what is the rational for the additional 'earth' wires.

oh god here we go again.

Read above, I already put why.

It became popular modification in Japan a few years ago as the stock wiring loom is built to a budget and over time the wires corrode and connectiosn can become poorer.

Won't help in everycase but cheaper than a new loom and certainly shouldn't cause any harm

Plenty of knowledgable tuners do this to bikes and cars which are suffering from poor electrical systems and have good results.

Could not help myself had to ask the question, and answers were as expected.

Notwithstanding what many other car and bike forums say and knowledgable tuners do, analysis of the wiring configuration of an nc30 will confirm that none of the listed earthing wire additions will do anything to improve the electical system.

As with any problem, there is a specific solution .

magg wrote:Could not help myself had to ask the question, and answers were as expected.

Notwithstanding what many other car and bike forums say and knowledgable tuners do, analysis of the wiring configuration of an nc30 will confirm that none of the listed earthing wire additions will do anything to improve the electical system.

As with any problem, there is a specific solution .

haha I thought so, Magg's "wiring loom" sensor went off.. no posts in a while and then "somebody mentions earth wires"

But anyway, what is this analyis? I'd like to see how you arrive at this conclusion and what tests / findings its based upon. as not all bikes are the same. Not every problem has just one answer either. Would make things much easier if it did.

If we are talking about a factory fresh wiring loom and bike with no deteriation and a glance at a wiring diagram then I agree that it probably won't make a difference to the bike installing extra earth wires, However it won't make things any worse either...unlike some other "mods" that can be done cheap / free...

I can't find the blog-post now but I will try to find it, retired aircraft engineer did some really indepth anylsis on building extra earths and was using an oscilloscpe and some other stuffs I can't remember. He was talking about not only the issues of wire / connectors and parts degrading but also the aluminium in the frame itself and any impurities in it overtime can affect how well electricity can travel through it.

Now if were talking about a 20 odd year old bike with bad wiring then I can certainly see how it might help, I've seen VFRs that it has helped.

http://www.geocities.jp/enzo0125/asing.htm

Like this one.

I think its fair to say that for good working bikes its going to be no improvement but if you have a problem bike it can seem to help, unless of course you've tested such problem bikes that have been improved with an earth kit and debunked it as black magic?> in which case id be happy to see the results.