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Messages - Caulky

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Twins / Re: A65 crankshaft shim size "calculation"
« on: 30 June, 2018, 09:57:50 »
So, you need .009" of shims for .002" float, same as mine.

Twins / Re: A65 Partslist
« on: 01 June, 2018, 10:05:12 »
The link above gives sizes, location, etc, for Triumph and BSA fasteners.
However, some are missing (usually old british threads) and a few are wrong as reported by Triumph owners.
But it is quite extensive.

Twins / Re: 72 Rocker Cover Studs A65
« on: 29 May, 2018, 09:19:12 »
According to my '71 spares book. #39 are 4 x 14-1623, 5/16" UNF/UNC x 2".
The coarse UNC end screws in to ally head.
Hope this helps.

Twins / Re: '71 A65L Head gasket
« on: 27 May, 2018, 14:58:19 »
Thanks! I have had the cups come loose, on a Bonnie.
In the meantime I have contacted "Gaskets-to-go" who can make special gaskets.
I`ll post what happens.
I could buy two, one for anyone else in a similar predicament.

Twins / Re: '71 A65L Head gasket
« on: 27 May, 2018, 13:48:57 »
Thankyou, didn't think of that.
Are the caps just an interference fit?

Twins / Re: '71 A65L Head gasket
« on: 27 May, 2018, 11:10:28 »
I sent the head to "the cylinderheadshop", for new (ethanol) seats, valves and porting.
Not too keen on raising the barrels.
Bonding two copper gaskets together is an option.

Twins / Re: '71 A65L Head gasket
« on: 27 May, 2018, 10:45:18 »
Because the head has been skimmed and the exhaust pushrods cannot be fitted.

Twins / '71 A65L Head gasket
« on: 26 May, 2018, 20:12:12 »
Hi all
Anyone know where I can buy a 'thick' 2mm? copper head gasket for my lightning?

Twins / Re: '71 A65L valve timing
« on: 17 May, 2018, 20:08:41 »
The engine is in the frame.
I'm on the Isle of Wight.

Twins / Re: '71 A65L valve timing
« on: 17 May, 2018, 18:05:39 »
Hi again
After changing to the drive-side inlet valve only, and by advancing the cam-wheel by one tooth, the opening time on the degree wheel was reasonable.
So, fit the other inlet valve...but check the closing time first.
Same trouble, too early! 45 degrees after ABDC.
It makes me think I have the wrong camshaft fitted?
The other problems are mounting the clock and setting the tappet gap.
To eliminate the gap trouble, I clocked the adjuster screw to .015", by lifting/dropping the rocker arm.
The clock is reasonably steady, but as the rocker-arm moves, so does the angle.
As far as I can tell, the lobe centre is good.
I'm not happy with this, but what to do? Getting hacked-off with this.
Even if the inlet side is OK, the exhaust is likely to be wrong.

Twins / Re: Misfire
« on: 16 May, 2018, 10:17:43 »
You could try a larger main jet, or smaller?
A plug chop after it happens could give you a clue.

Twins / Re: A65 Lightning
« on: 15 May, 2018, 09:58:47 »
It would help if you post a picture and some details, year, matching numbers?, is it running?, etc.
Then someone may have guess of the value.
Have you looked on Ebay at similar models?

Twins / '71 A65L valve timing
« on: 21 April, 2018, 15:39:10 »
Sorry to bring this up, again.
Now, have I got this right?
I have read all that I could find on this subject, but some things are still confusing.
When doing this job, some say the 'clock' should be on the valve collar or on the rocker arm adjuster.
Others say, this is incorrect because the quoted figures are for the pushrods/tappet followers.

Another thing is, people talk about 'lift', do it at .040".
Lift meaning valve lash? It could mean, turn the crank + .040" @ 0.015" lash, after the needle begins to move and read the degree-wheel?
Also, taking the WSM figures for inlet: open 51* BTDC, close 68* ABDC at 0.015" lash.
Using these figures, we have 51+180+68 = 299*. 299/2 = 149.5*.
The cam lobe centre is given as 98.5* crank ATDC, so for the cam centre we subtract 51* from 149.5* = 98.5, OK fine. (this MAY be the lobe peak, but not neccessarily).
But, the quietening cam ramp needs to be avoided, so the measurements need to taken at .040" lash, not at 0.015"
OK so far?

Twins / Re: A65 Gearbox Camplate
« on: 17 April, 2018, 10:55:57 »
My '71 spares book shows 57-4026 for all variants.

Twins / Re: Tight Valve rocker spindles
« on: 08 April, 2018, 09:55:09 »
It is not an easy job and requires patience.
You should be able to slightly withdraw the spindle, without disturbing the other washers.
If you look through the assembly, from the other side using a flashlight, you can see which washer/spring is out of alignment.
I use a small paint-brush handle to align the holes.
Do not force it!

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