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Messages - Caulky

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1
Twins / Re: A65 charging
« on: 06 December, 2017, 11:44:14 »
You may have cooked your battery, they do not like being over-charged. (and could cause a fire)
The zener is manufactured to limit the voltage to about 15V-ish.
When the rectified Voltage from the alternator reaches the zener cut-off Voltage, It passes current (Amps) to earth.
It gets hot, hence the heat sink.
This limits the Voltage to the battery.
 
i.e. say the Voltage output (without zener) is 20V, the zener needs to reduce this Voltage by 5V.
In avalanche mode, the resistance of the diode may be very small. Say 1.0 Ohms.
W (Watts) = E squared (Volts) / R (Ohms) so, 5 x 5 = 25/1.0 = 25 Watts.
W = EI so I = W/E, I = 25W / 8V = 3 1/8 Amps.
The diode plus heatsink must dissipate 25 Watts as heat. It needs a good airflow across it to dissipate this heat.

2
Twins / Re: A65 OIF Filter
« on: 25 November, 2017, 10:03:53 »
Wash it in a bath of paraffin (kerosene) and put it back.

3
Twins / Re: Head light switch for a 1971 A65 L
« on: 04 November, 2017, 14:16:07 »
This rotary light switch 31276 (19-1095) can be found here:
http://www.tigercubspares.co.uk/html/lighting.html

4
Twins / Re: A65 swingarm bush removal
« on: 31 October, 2017, 12:18:15 »
So, we are not talking about "swinging arm bushes"
You are talking about metalastic suspension bushes, wish I'd known before. :(

5
Twins / Re: A65 swingarm bush removal
« on: 31 October, 2017, 10:06:41 »
I bought a special tool, 61-6117 for my '71 A65L.
This removes and fits the bushes.
Don't know about other models/years?

6
Twins / Re: Oil pipes on OIF 650 1971-72
« on: 24 October, 2017, 10:29:34 »
May depend on the model, but my A65L uses 1/4" bore.
I bought mine from here:
http://www.tms-motorcycles.co.uk/store/products/list.asp?cat_id=21

7
Twins / Re: A65 Fitting a oil pressure gauge
« on: 15 October, 2017, 10:51:23 »
Put a loop on the capilliary pipe so that there's no tension on it.
Vibration is the enemy.

8
Twins / Re: A65 Fitting a oil pressure gauge
« on: 14 October, 2017, 12:32:31 »
I use one of the T-piece outlets for a connection to the capilliary tube, the other for the oil pressure switch.

9
Twins / Re: A65 Fitting a oil pressure gauge
« on: 14 October, 2017, 10:35:19 »
I bought all of the parts required from here:
http://www.vehicle-wiring-products.eu/product.php/210/oil-pressure-gauge-capillary-type

They also supply a capillary extension kit and T-piece.
Send for their catalogue.

10
Twins / Re: 1971 A65L crankshaft
« on: 05 October, 2017, 11:05:17 »
Of course, thanks Julian.

11
Twins / 1971 A65L crankshaft
« on: 05 October, 2017, 09:42:57 »
Anyone know the length of the crank centre to the crank-pin centre?
I.E. the crank radius.

12
Twins / Re: 1971 A65L Piston hitting inlet valve
« on: 04 October, 2017, 18:16:32 »
Preliminary checks appear to show that the inlet valves are beginning to open far too early.
But, I can't find my degree wheel, so I'll make another to check it out.

13
Twins / Re: 1971 A65L Piston hitting inlet valve
« on: 30 September, 2017, 18:15:38 »
I have not really had a chance to check the valve timing, but the inlet is open at TDC, which confirms my suspicions.

14
Twins / Re: 1971 A65L Piston hitting inlet valve
« on: 30 September, 2017, 17:28:31 »
Well. I think so, short ones outside.

15
Twins / 1971 A65L Piston hitting inlet valve
« on: 30 September, 2017, 16:45:33 »
And it was going so well....
I fitted the inlet rocker gear and was about to fit the exhaust rockers.
Then I put the right-hand pushrod on, turning the engine with a spanner on the alternator nut.
Watched the valve opening, then it locked.
With the adjuster fully out it will turn-over completely.

This is a head off job now.
There could be many reasons for this to happen, just about everything is new.
I'm thinking, wrong camshaft, wrong followers, wrong pistons, etc.
Any thoughts? 

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