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Author Topic: Down under, an idiot and a 400F  (Read 276372 times)

Offline neevo

  • Posts: 2225
    • The blog of my custom CB400F build
Down under, an idiot and a 400F
« Reply #2685 on: Feb 25, 2017, 01:20:40 »
So I've bought some Deutsch connectors to extend the wiring on the Acewell. There's room in front of the coils for the plugs and the new connectors mean I can put longer wires on for connecting to the harness.

Feeling better about that one.

Also I'm keen to buy some plugs and chop the plug wires.

Anyone know the correct spark plugs?

Also should I make all the sparkplug leads the same length? Any recommendations on the right length?

The old coils had short leads and they all looked different lengths:

« Last Edit: Feb 25, 2017, 01:23:23 by neevo »


See the condensed version of my full build on my blog!

Offline yorkie350

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Re: Down under, an idiot and a 400F
« Reply #2686 on: Feb 25, 2017, 08:00:55 »
Hi mate the leads for sparkplugs are 1 & 4 should be same length as each other but longer than 2 & 3 and 2&3 are the same length as each other the spark plugs are usually NGK D8EA  if you have enough spare length you could trim off a 1/4 " from the plug end so when you put new caps on you get a good connection ,hope this helps bud every little helps .
Life's too short to go slow at anything !  unless your re-building ya ride !!

 cb350f '72 café racer 
 cb550f '78 Hailwood race rep

Offline neevo

  • Posts: 2225
    • The blog of my custom CB400F build
Re: Down under, an idiot and a 400F
« Reply #2687 on: Feb 25, 2017, 21:08:37 »
I grabbed some DR8ESL's as that's what David Silver had listed for the 400F, hopefully they are correct.

Also looks like someone messed with the old plug leads as they are all over the place for length. So essentially I need 2/3 the same length and 1/4 the same length (eg same length for both leads from each coil). Then 2/3 is shorter than 1/4, I assume that's because 1/4 are the outside cylinders and will naturally need more length?


See the condensed version of my full build on my blog!

Offline neevo

  • Posts: 2225
    • The blog of my custom CB400F build
Down under, an idiot and a 400F
« Reply #2688 on: Feb 26, 2017, 01:55:50 »
Think I bought the wrong plugs. $20 for 4 so not the biggest disaster.

Measure the plug caps and they are 5.2k ohms so I think I need the non R plugs. Can someone confirm?

D8ESL doesn't exist so I assume D8EA as per Yorkies suggestion.

Yorkie I have non standard and brand new coils so was hoping to know stock length for plug wires so I can try and get it right first time vs guessing.
« Last Edit: Feb 26, 2017, 02:08:13 by neevo »


See the condensed version of my full build on my blog!

Offline yorkie350

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Re: Down under, an idiot and a 400F
« Reply #2689 on: Feb 26, 2017, 05:52:24 »
You got the idea right about reason for length of plug leads ,can't find a measurement in any manuals i'le go out the garage and measure up mine I know I trimmed 1/2 inch or so off to clean the ends up but still plenty left not too short at all.
Life's too short to go slow at anything !  unless your re-building ya ride !!

 cb350f '72 café racer 
 cb550f '78 Hailwood race rep

Offline neevo

  • Posts: 2225
    • The blog of my custom CB400F build
Re: Down under, an idiot and a 400F
« Reply #2690 on: Feb 26, 2017, 05:54:10 »
You got the idea right about reason for length of plug leads ,can't find a measurement in any manuals i'le go out the garage and measure up mine I know I trimmed 1/2 inch or so off to clean the ends up but still plenty left not too short at all.

Thanks yorkie, knowing what they "should be" would be awesome.


See the condensed version of my full build on my blog!

Offline yorkie350

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Re: Down under, an idiot and a 400F
« Reply #2691 on: Feb 26, 2017, 06:07:19 »
Ok so the leads from 2&3 are  10" and the leads from 1&4 are 13" at this length they aren't over stretched and as I said I trimmed back a little to get a good connection to the plug cap, hope it helps mate I know new aftermarket coils come with a lot of length on the leads allowing to trim to required length.
Life's too short to go slow at anything !  unless your re-building ya ride !!

 cb350f '72 café racer 
 cb550f '78 Hailwood race rep

Offline neevo

  • Posts: 2225
    • The blog of my custom CB400F build
Re: Down under, an idiot and a 400F
« Reply #2692 on: Feb 26, 2017, 08:04:20 »
That's awesome. Thanks yorkie!


See the condensed version of my full build on my blog!

Offline neevo

  • Posts: 2225
    • The blog of my custom CB400F build
Re: Down under, an idiot and a 400F
« Reply #2693 on: Feb 27, 2017, 06:15:50 »
Few more parts in and had a crack at trimming the plug wires.

First up we're new EBC rear brake pads, will be a while before they're fitted but they're there when I need them:



Trimming the plugs was the next item on the agenda this evening. Thanks yorkie for the stock lengths, I added the 1/2" on to the lengths (10.5" and 14.5") but I think I could trim a bit more off too as there's still plenty on length on there and they are looping a bit under the tank.

Trimmed:



Mounted:



Outside ones aren't too bad but the inside ones are a bit loopy as you can see. Might get the plugs in there, then see if I need to trim a bit more.


See the condensed version of my full build on my blog!

Offline neevo

  • Posts: 2225
    • The blog of my custom CB400F build
Re: Down under, an idiot and a 400F
« Reply #2694 on: Mar 03, 2017, 05:40:48 »
Latest bit of gear has landed in the shop, 30" metal brake. I'll be bending up my new seat designs with it and making sure I get some straight edges.



See the condensed version of my full build on my blog!

Offline crazypj

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  • Split personality, I fake being smart
Re: Down under, an idiot and a 400F
« Reply #2695 on: Mar 15, 2017, 01:37:27 »
I always found the stock plug leads were about 2" different for 1-4, when coil is mounted on bike the  number one lead is closer to plug than number 4. They were always long enough to swap side to side though which allowed several 1/4" pieces to be removed when you fitted new plug caps. DR8ESL are just resistor plugs, stock caps for 75~77 were 10K Ohm with non resistor plugs so 5K caps and 5K plugs should be fine. The carbon contact resistor in plug caps goes high resistance after about 10~15 yrs so they need changing though
« Last Edit: Mar 15, 2017, 01:42:49 by crazypj »
'you can take my word for it or argue until you find out I'm right'
I gave my girlfriend an orgasm the other night, but, she spat it back at me
 Some humans would do anything to see if it was possible to do it. If you put a large switch in some cave somewhere, with a sign on it saying 'End-of-the-World Switch. PLEASE DO NOT TOUCH', the paint wouldn't even have time to dry
 It’s not worth doing something unless someone, somewhere, would much rather you weren’t doing it  (Terry Pratchett)
CB360's,  http://www.dotheton.com/forum/index.php?topic=11736.0
XS650,  http://www.dotheton.com/forum/index.php?topic=11922.0

Offline neevo

  • Posts: 2225
    • The blog of my custom CB400F build
Re: Down under, an idiot and a 400F
« Reply #2696 on: Mar 15, 2017, 20:23:45 »
Thanks PJ as always. I trimmed the leads and bought a sparkplug socket to hand tighten the plugs and now it all looks fine, bit of length in there but they don't look silly. Plenty of future trimming length too.

Good to know re the plugs and caps, 10k will be ok to have a go then by the sounds of it. What's the issue with high resistance? I assume it reduces the current draw?


See the condensed version of my full build on my blog!

Offline crazypj

  • Posts: 12237
  • Split personality, I fake being smart
Re: Down under, an idiot and a 400F
« Reply #2697 on: Mar 23, 2017, 12:07:38 »
I don't know how the carbon resistors in caps go high resistance but it reduces voltage to plugs causing missfires at higher rpm.
Same thing happens to carbon leads on cars, except they normally need changing every 3~5 yrs
'you can take my word for it or argue until you find out I'm right'
I gave my girlfriend an orgasm the other night, but, she spat it back at me
 Some humans would do anything to see if it was possible to do it. If you put a large switch in some cave somewhere, with a sign on it saying 'End-of-the-World Switch. PLEASE DO NOT TOUCH', the paint wouldn't even have time to dry
 It’s not worth doing something unless someone, somewhere, would much rather you weren’t doing it  (Terry Pratchett)
CB360's,  http://www.dotheton.com/forum/index.php?topic=11736.0
XS650,  http://www.dotheton.com/forum/index.php?topic=11922.0

Offline neevo

  • Posts: 2225
    • The blog of my custom CB400F build
Re: Down under, an idiot and a 400F
« Reply #2698 on: Mar 23, 2017, 12:10:23 »
I might buy non resistor plugs at some stage then. Why bother running the risk of it not working for $20


See the condensed version of my full build on my blog!