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Messages - L.A.B.

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2
British Bikes / Re: bsa lightning
« on: September 25, 2018, 12:33:36 AM »
after looking at the parts list, the heat spacer looks more like a thick gasket, would that be right?

I'm not sure but if they were then the originals could have been an asbestos composite material which you wouldn't necessarily want and probably aren't available now.


or as I was expecting would it be a proper spacer? ie maybe 10-15mm thick or so?

The thicker the better but I don't think the studs would be long enough for ones 10-15mm thick and the 70-7821 spacers available are thinner.

3
British Bikes / Re: bsa lightning
« on: September 23, 2018, 05:57:49 PM »
also look at my parts list and try and get spacers,

There should also be an O-ring (622/101) on the carb side of each spacer.
https://www.draganfly.co.uk/index.php/bsa/bsa/a50-a-a65/concentric-carburetter



4
British Bikes / Re: bsa lightning
« on: September 23, 2018, 03:31:25 PM »
one thing that has been pointed out is there is no heat spacers between the carbs and manifold, just a gasket, could this be the problem?

Yes, it could be, or at least the lack of heat spacers won't be helping matters so I suggest you fit them because they should be there (70-7821 according to the parts list).

https://www.draganfly.co.uk/index.php/bsa/bsa/a50-a-a65/1969/category/313-69-cylinder-barrel-valves


or would dropping the needle in the carbs one (last) notch help?

The Lightning needles should be at the No.1 weakest position (clip in the top groove) according to the '69 - '70 factory manual.

6
British Bikes / Re: Tiger cub rectifier .
« on: September 09, 2018, 11:19:14 PM »
Judging by the condition of that wiring the best thing to do would be to rip it out and replace it.

7
British Bikes / Re: Tiger cub rectifier .
« on: September 07, 2018, 12:39:43 PM »
When you say "do not work in the same manner" could you expand? From my limited electronic experience one bridge rectifier is much like another provided the operating parameters are the same.

I didn't say. It's a "quote" from the ebay ad.

9
British Bikes / Re: Tiger cub rectifier .
« on: September 06, 2018, 06:42:34 PM »
Yes.

10
British Bikes / Re: Tiger cub rectifier .
« on: September 06, 2018, 05:11:25 PM »
Pics of old and new attached  but there are so many options for connections on the new one, and I just cant get my head around the directions of the diodes

As standard, your Tiger Cub's electrical system would be positive earth/ground.

That rectifier is not only a nine-diode type for a three-phase excited field (slip-ring) alternator as it appears to be a rectifier for a Lucas "ACR" alternator but it is almost certainly negative earth polarity. 

http://freerollguide.net/probably-fantastic-free-automotive-alternator-wiring-diagram-pictures/images-of-wiring-diagram-lucas-18-acr-alternator-wiring-diagram-image138-that-great/


https://www.ebay.ie/itm/REPLACEMENT-12-VOLT-ALTERNATOR-RECTIFIER-LUCAS-ACR-LRA100-UBB109-83166-130643-/281815311556

A 4-diode rectifier like this is all that's required as it can be used for either positive or negative earth.
http://www.rexs-speedshop.com/Single-Phase-Bridge-Rectifier 

Or:
http://www.classicmotorcyclespares.com/index.php/default/electrical/charging-system/classic-bike-rectifiers-regulators-bsa-triumph-norton/rectifier-replica-lucas-positive-earth.html#Charging_System

The old selenium rectifier needs throwing in the bin, regardless.

12
British Bikes / Re: 1952 Norton ES2 spark plug
« on: July 19, 2018, 04:36:10 PM »
I agree 5/8" does seem a lot - it equates to 42 degrees or so but I'll try it at that and see how it goes. Possibly after breaking my ankle......

1947-58 ES2 is 0.375" (3/8") according to Roy Bacon's Norton Singles book.

13
British Bikes / Re: Smiths speedo as fitted to 73 Bonnie.
« on: July 08, 2018, 10:35:48 PM »
The trip knobs don't always fit back as tight afterwards, which seems to be why they are often missing.

14
British Bikes / Re: Smiths speedo as fitted to 73 Bonnie.
« on: July 08, 2018, 08:11:35 PM »
The trip knob should pull out, however, they're often stuck due to corrosion.

15
British Bikes / Re: b.s.a.c15 gearchange spring anchor bolt
« on: June 14, 2018, 10:48:07 AM »
As you have the bolt then why not measure the threads per inch (TPI)?

1964 sounds a little early for it to be UNF so what is the TPI of this 5/16" bolt?

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