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Messages - LIONELSMITH

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1
Twins / Re: 1959 A10 GF Wiring Loom
« on: 31 January, 2024, 10:56:25 »
I would always over engineering the wiring. When I re-designed the new loom including new equipment, I added all the loads in Amps on each wire, added for the circuit and doubled them and got the appropriate wire. I find it useful to design in Fuses so if you get a problem 1. Not everything goes down and 2. you know better where to look.
I don't like AWG American Wire Guage, Europe uses the diameter and number and size of copper strands.
I use a chart as below
AWG   Diameter   Area   Resistance   Max Current   Max Frequency
[inch]   [mm]   [kcmil]   [mm2]   [mΩ/m]   [mΩ/ft]   [Ampere]   for 100% skin depth
4   0.2043   5.189   41.7   21.2   0.8152   0.2485   60   650 Hz
5   0.1819   4.621   33.1   16.8   1.028   0.3133   47   810 Hz
6   0.1620   4.115   26.3   13.3   1.296   0.3951   37   1100 Hz
7   0.1443   3.665   20.8   10.5   1.634   0.4982   30   1300 Hz
8   0.1285   3.264   16.5   8.37   2.061   0.6282   24   1650 Hz
9   0.1144   2.906   13.1   6.63   2.599   0.7921   19   2050 Hz
10   0.1019   2.588   10.4   5.26   3.277   0.9989   15   2600 Hz
11   0.0907   2.305   8.23   4.17   4.132   1.260   12   3200 Hz
12   0.0808   2.053   6.53   3.31   5.211   1.588   9.3   4150 Hz
13   0.0720   1.828   5.18   2.62   6.571   2.003   7.4   5300 Hz
14   0.0641   1.628   4.11   2.08   8.286   2.525   5.9   6700 Hz
15   0.0571   1.450   3.26   1.65   10.45   3.184   4.7   8250 Hz
16   0.0508   1.291   2.58   1.31   13.17   4.016   3.7   11 K Hz
17   0.0453   1.150   2.05   1.04   16.61   5.064   2.9   13 K Hz
18   0.0403   1.024   1.62   0.823   20.95   6.385   2.3   17 K Hz
19   0.0359   0.912   1.29   0.653   26.42   8.051   1.8   21 K Hz
20   0.0320   0.812   1.02   0.518   33.31   10.15   1.5   27 K Hz
21   0.0285   0.723   0.810   0.410   42.00   12.80   1.2   33 K Hz
22   0.0253   0.644   0.642   0.326   52.96   16.14   0.92   42 K Hz
23   0.0226   0.573   0.509   0.258   66.79   20.36   0.729   53 K Hz
You may find the following web page from 12 Planet useful with a video and conversion chart https://www.12voltplanet.co.uk/cable-sizing-selection.html

2
Twins / Re: Oil Pipe connections
« on: 23 October, 2023, 17:01:53 »
Thanks again Julian

3
Twins / Oil Pipe connections
« on: 23 October, 2023, 15:29:06 »
Simple question 1961 A10 Golden Flash The Oil feed from the Oil tank goes to the higher or lower connection to the crankcase? I thought t was lower, but as I have had the SRM crank bush conversion I have put the spring and ball bearing in the TOP right pump hole and was told this only affect the input side? This could sort my oil feed problems.
Thanks

4
Twins / Re: Erratic running
« on: 07 October, 2023, 09:32:48 »
Surely if it was running well before the rocker box came off, it has to be something to do with that. Do you know what caused the screws to loosen?
My first thought would be to lift the rocker box and check the valve clearances and while you are there check the head is at the correct torque.

5
Twins / Re: Starting a rebuild
« on: 07 October, 2023, 09:24:14 »
I've now primed the Oil Pump and am getting oil through to the pressure relief valve hole and with the PRV refitted, into the sump. Here it collects and leaks out presumably under pressure. I spent several hours kicking the bike over to find this latest issue.I cannot find any information on the Scavenge pump. The pump had to have been fitted by SRM when they rebuilt the lower engine after regrinding the crank, fitting the timing side crank bearing conversion, cleaning the traps and fitting alloy Con Rods. I have tried poking a pin up the scavenge pipe and it hits metal, I assume something must rotate to pump out the oil and it is in the closed position. I have fitted an SRM high volume oil pump and have got to talk to them about a bearing and spring I never had.
Questions
Can a scavenge pump fail and how do I check it?
Is this the likely culprit or are blockages possible, should I drain down again and blow compressed air through?
Anything else
I just want to get it on the road before I am too old to ride it!!

6
Twins / Rear brake cross shaft lever, Iron or Steel
« on: 25 September, 2023, 11:57:06 »
I am converting the rear brake to Twin Leading Shoe (TLS) on my A10 Golden Flash. I have just taken the rear brake Cross Shaft Lever 42-4530 (other end of the shaft to the brake pedal) and my engineer asked whether it was iron or steel. I assumed steel, does anyone know?

7
Twins / Re: Starting a rebuild
« on: 23 September, 2023, 15:19:51 »
 I'm not starting the Bike again until the oil priming is sorted, but turning it over I am getting two rattles from the top of the engine. I've been doing some reading. After finding one push rod had dropped out of the rocker cup a while ago I am wondering whether the cam followers are sticking.
Has anyone ad this? It is probably time for my umpteenth engine strip down only this time the block comes off.

8
Twins / Re: Starting a rebuild
« on: 14 September, 2023, 16:28:32 »
Thanks for the replies Pete, Rhyatt and neil1964.
As said yesterday the rocker cover is now off and looks a little dry, although a drip or two of fresh oil had made it to the left rocker (maybe the pump worked after all?). My 67-267 rocker cup (right exhaust) is more worn than the others, probably the one I replaced, however, the 67-265 (right inlet) was causing the issue.
Neil sorry about the dodgy guide but how do you describe a noise, a single metallic clack? What confused me was that the engine still ticked over nicely. I was thinking rocker shaft which is why the Rocker box is off but thanks for the confirmation. I do like to think before acting.
I will force some oil though the oil holes in the rockers and rotate them to try to get the shafts lubricated.
Pete, my engineer thought the valves were OK so I am usually loathed to try and lubricate those as at running it will coke the combustion chamber when it gets through, but maybe a little on that valve. Some oil will drip down anyway.
Rhyatt, very good point about priming the pump, I didn't do it. I will have to have a look at the pump as I had the casing adapted to take a feed for the tacho but I was not convinced it was totally straight, just in case the oil pump shaft is damaged.

Further update.
After stripping the rocker box off and oiling I re-assembled. It starts first time runs 4-5 seconds there is a loud single clack sound and it stops. It restarts, same run time, same sound, same result. I tried this three times. I did put some oil down the suspect vale. Does this sound like a sticking valve?
I am going to have to take the rocker box and head off,measure the SRM push rods take the valves out and check for sticking valve. It does sound top end. I did also before the third restart unscrew the tacho cable and it did the same so it is not that.
To try and give an idea of the sound, it sounds like the clack you get hitting a metal table with a metal rod.
Any other ideas?
 

9
Twins / Re: Starting a rebuild
« on: 13 September, 2023, 17:50:26 »
Thanks cddorset. No I admit that I was to check on starting and I cant see any oil flow on running, probably not enough pressure running so briefly, certainly none kicking. It is a new SRM pump.
When I re-checked the tappets one push rod was not under the rocker but when I lifted the rocker it flipped back. 
I rebuilt the Rocker box with new Rocker shafts, replaced one of the rockers that had a crack and used new tougher push rods. I will dismantle again tomorrow check the cups, re-oil and rebuild. Can the rocker cups be deepened if worn?

10
Twins / Re: Starting a rebuild
« on: 12 September, 2023, 18:25:48 »
Good news and not so good. at which point I turned off
After removing the air filter and rebuilding the carb the bike has started for the first time and was idling happily. BUT I am getting an intermittent loud metal on metal sound. It is not terminal as it ran until I turned off but is worrying. I think it has got to be tappets first to check. Has anyone had such a sound on first starting? I am getting no blue smoke from the exhaust so it may just need the oil to start lubricating. Any suggestions please.

11
Twins / Re: A10 head info reqd please.
« on: 11 September, 2023, 16:41:45 »
It was the Road Rocket that had the Alloy cylinder head with an inlet manifold separate to the cylinder head, enabling twin carburettors to be fitted.. So it could be a genuine RR engine. That is worth checking.

12
Twins / Re: Starting a rebuild
« on: 11 September, 2023, 16:27:00 »
An interesting development. Since your helpful comments I took the head off and got my local engineer to check the valve guides and valve seats I had put in. One exhaust valve guide had gone in a little crooked, he re-seated this and he re-ground the valves again.
I have assumed the non-starting was, as it usually is, electrical, probably timing. This I checked today with a timing light (too long to go into) and it was spot on. I decided, therefore, it must be fuel. I took the carb off today to strip the lot but found the new paper air filter was brown and soiled, surprising since it has not started yet.
Daft question of the week, can the engine blow backwards. Could I have been pushing fuel into the filter rather than the engine? When I do the timing I check to see which cylinder at TDC has the valve closed to check the cycle, but why such a dirty new filter.
After the carb rebuild should I start it without a filter or put a new cleanable metal wire filter in its place. I just want Billy running.

13
Twins / Re: A10 back on the road!
« on: 11 September, 2023, 15:54:18 »
Alan G
SRM are very good at what they do and the items, upgrades and services they sell but you need to be aware they are expensive.

14
Twins / Valve grinder
« on: 11 June, 2023, 22:10:44 »
After a rebuild I cannot start my '61 A10. I leak tested today and it is about as airtight as a sieve through all valves. I know of SRM and found MNR in London but does anyone know of a good valve grinder in the Surrey/West Sussex or North Hants areas?
I am also getting weak orange sparks and have some suggestions from Pazon. I'll sort that after getting the head right.

15
Twins / Re: A65/a50 Electric start
« on: 16 May, 2023, 10:24:25 »
For what it is worth I have fitted the Steve's A10 electric start on my golden flash. It was an intensive detailed fit but works well.

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