Repair-Chat
This page is for any comments, pictures, stories or information you might want to impart to the site that don't necessarily
fit anywhere else on the website.
There are rules!
Primarily don't be rude, offensive or obnoxious, for more details CLICK HERE
See Older Posts
Glyn said :-
If you can find 2 top quality 13.2 volt zenner diodes, could you not simply use them to energise the coil of a 20A relay that is directly across the two batteries as your diode currently is? Or, perhaps better still, a zenner to fire an NPN transistor to energise the coil. Hardly worth the effort with that Maypole and other similar devices being so reasonably priced though.
11/06/2025 13:44:04 UTC
Ian Soady¹ said :-
All now connected up and tested. It works just as I hoped it would. Starts readily - albeit after a bit of churning over - and runs well although at the moment still a static test. The charging system is also working - I temporarily included an LED to show when the auxiliary battery was getting charge and that showed it was at everything over a fast idle. Of course it needs a road test and some time to show that it's a permanent solution. I also need to tidy up the wiring. Below is the diagram for the charging side usinmg the VSR device.
Yes Nigel, I'm getting confused it was Glyn I meant! I agree that 10 volt is supposed to be a reasonable cranking voltage. However, the Boyer Bransden kit was originall designed for the likes of Commandos and Bonnevilles pre-electric start. They did admit to me "Although the MK4 box can operate at lower voltages, power will still remain very low".
Below is the charging circuit. 6 is the switched positive output (there is another one which I used to light the LED). 12 is positive input, 0 negative. Ignore the 11.30 - no idea what that was......
11/06/2025 14:32:58 UTC
Glyn said :-
Well done Ian. It would have been a bit easier if the bike was negative earth. So when pin 85 has a voltage that energises the relay, pins 86, 87 and 30 are all at the same potential, very clever.
11/06/2025 18:02:25 UTC
Ian Soady¹ said :-
Thanks Glyn. I like relays, they've got me out of a few sticky spots as they can be used as in this case to isolate circuits. If I was starting this project and knew what I know now I probably would have converted to negative earth from the beginning which makes life easier especially when other bikes and cars are that way round. I sometimes get brain fade trying to work out what's what.
The only disadvantage I can see is the added complexity and potential failure points. If I needed to it's a simple matter to just reconnect the original system and disconnect all this gubbins by means of a single wire.
I've had the thing on charge overnight using a CTEK "intelligent" charger connected to the main battery and it's successfully charged both which is a further bonus. I do suspect that the VSR is cutting in below the specified 13.5 volts but haven't actually checked it. It's quite satisfying holding the relay and revving the engine when I can feel the relay click.
12/06/2025 09:56:18 UTC
Glyn said :-
Remember the Fantic that was left in mid air when the repaired engine was sent back to its owner untested? well its back in the frame and running rather well as can be seen here; https://youtube.com/shorts/2uo9ilbiQLg?feature=share
13/06/2025 06:29:17 UTC
Glyn said :-
Sorry link seems to have failed, try this;
https://www.youtube.com/shorts/2uo9iIbiQLg
13/06/2025 06:31:39 UTC
ROD¹ said :-
Clickable link.
https://www.youtube.com/shorts/2uo9iIbiQLg...
13/06/2025 09:47:58 UTC
ROD¹ said :-
The bike sounds very good (for a two stroke).
I am just trying to protect myself from a ban. It sounds perfect on the video, good job!
13/06/2025 09:52:16 UTC
Glyn said :-
The Ed is caught in a bit of a trap here. He likes the theory and the spanner work but needs to remain, and be seen to be, anti these little strokers. He will be secretly viewing this video over and over until there could be some advertising income for me . He won’t ban you Rod, you’re too valuable a contributor.
13/06/2025 18:58:37 UTC
Ren - The Ed¹ said :-
Perhaps I should ban you all due to a lack of respect! I have watched the video once merely out of curiosity. It has offended my ears once and I shall not be party to encouraging such behaviour anymore. Pffffft!!
I ought to congratulate Glyn on a job well done but it goes against my religious and cultural beliefs.
13/06/2025 20:14:56 UTC
Upt'North ¹ said :-
Since when was miserly curmudgeoness a religion?
14/06/2025 10:06:51 UTC
Ren - The Ed¹ said :-
It's my own religion Upt'. The Sacred Church of The Miserly Curmudgeon teaches us prudence and a miserable existence are the one true path to enlightenment. Only through savings and sufferings can we transcend.
14/06/2025 17:24:53 UTC
ROD¹ said :-
Ren, Does this religion require monogamous relationships, or does it allow more than one bike?
14/06/2025 18:22:59 UTC
Glyn said :-
Careful Rod, you and I are on the naughty step already. I’m applying to join the Ren convent in order to gain appeasement. It’s also a desperate move as I’ve been banned from other groups already and my options are becoming limited. I, like you, have not forsaken all other bikes in favour of one.
15/06/2025 07:43:50 UTC
Ren - The Ed¹ said :-
Monogamy with regards to motorcycles is not required, ideally the correct number of motorbikes a rider should own is always "one more than you already own". If you have one you need 2, if you have 2 you need 3, and so on until you own every motorcycle ever created.
With regards interpersonal relationships the choice is yours, subject to everyone being of sound mind and above the age of consent. We encourage healthy relationships of all kinds.
I am beginning to think this place is becoming a haven for those turfed out of "real" forums!
15/06/2025 10:13:50 UTC
Glyn said :-
We’re not entirely faithful to BAT I must say. When I was seeking a Honda European I joined a forum and there was this fella known as Up’t North writing a few lines. I joined the BMW K series forum and was heavily chastised when certain members saw a picture of my LT1100. There was some abusive comments asking what type of idiot would do that to the perfect bike. I wasn’t banned but left very quickly. The TZR Forum chaps are great as are the Fantic guys. The specific info available at these sites are a must for my kind of resto work. However, BAT is right up my street with excellent humour and items to keep me interested and informed. Please don’t expel me Ed.
15/06/2025 11:37:04 UTC
Upt'North ¹ said :-
Yes Ed, you're not wrong. I've been banned from better forums than this! Still am, but Glyn is right he did see me on the ST forum, before I was ejected obviously.
Just seen the weather forecast for next week Ed, I think I fancy a short Tour de Yorkshire. Sounds splendiferously splendiferous.
Upt.
15/06/2025 12:46:49 UTC
Ian Soady¹ said :-
There are better forums than this? Wash your mouth / keyboard out!
15/06/2025 16:03:44 UTC
Glyn said :-
Shove up Rod, we’re going to need a bit of space on the naughty step for Ian.
15/06/2025 18:04:56 UTC
Glyn said :-
At ease Rod, I just read Ian’s post again and I says
There are better forums than this ?
Not
There are better forums than this !
I thought it was a bit strong.
15/06/2025 18:55:02 UTC
Name
Comment
Add a RELEVANT link (not required)
Upload an image (not required) -
Uploading...