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Topics - Caulky

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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 / '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 / '71 A65L valve timing
« on: 26 March, 2018, 17:21:45 »
Hi All
Before the winter break and fitting the pushrods. rocker gear, etc, turning the engine using a spanner on the rotor nut, it jammed BTDC.
So, I thought piston hitting the inlet valves.
I set it up with just the right inlet valve, clock and degree-wheel.
Today, I thought, check the timing marks... they are OK, but for the left valve, hence I had to rotate the engine 360* for the R/H side.
I set the gap to .015" as per the book.
The valve should open at 51* BTDC, but mine begins to open 16* before that, but strangely the piston and valve doesn't collide!
So it must be the left?
I should add that everything is new and the head was sent away for an overhaul, new seats, valves, gas-flowed, etc.
Something is wrong, any suggestions would be appreciated.

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.

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? 

Twins / 1971 A65L Kickstart return spring
« on: 23 September, 2017, 18:21:18 »
OK I give up.
What method do you use to fit this spring, been struggling with this for too long?
There is a video on youtube, but he has fitted it with the tang at the good.
Even if fitted it with hook down, there would be very little tension and the tang fouls the case anyway.

Twins / 1971 A65L Camshaft nut
« on: 11 May, 2017, 20:13:17 »
There is no torque figure for this nut.
How tight should it  be and how much float?
At the moment I have about 1/16th" lateral movement.
I had to manufacture a woodruff key, because the keyway is 5mm wide?
I think I over-tightened it, the first time and it became solid.

Twins / Aftermarket oil filter
« on: 18 April, 2017, 12:05:52 »
I did a few web searches about oil filters for our old bikes.
Specifically for which line, inlet or return.
I have already bought a Champion filter.
Depending on the bike manufacture, there is confusion!
Most say the filter is in the return, but others say the feed.
The ones that say the feed-line, explain that the return is pulsing and aerated, which can damage the filter material.
The others for the return, say nothing should be in the feed side.
So how about my OIF A65L?

Additionally, this bike was fitted with an oil cooler. (U.S. import)
Is this rerquired for here in the UK?

Twins / Oil pump
« on: 17 April, 2017, 13:31:49 »
1971 A65L
I bought a new spindle for this pump because the old one had chipped and worn teeth.
After disassembling and cleaning, I find its a little tight to turn.
Maybe it will be ok after its 'run-in'.
It will turn using a screwdriver, but not using my fingers.
Is this normal or should I take it apart again?

Twins / Nuts
« on: 27 March, 2017, 13:00:58 »

I am just about ready to put the case-halves together with the crankshaft to check the end float.
I am aiming for .002" float, using two .0045" shims, giving .009".
But there's a problem!
All of the case nuts are 'locknuts', some with spring washers.
Having read lots of stuff about locknuts, it appears that metal locknuts deform the threads.
As these have to be undone and re-fitted, its not a good idea to torque them up and undo them.
These can only be used once?
So I'm thinking to temporarily use plain fullnuts or nylocs.
And why not use nylocs anyway (once) instead of metal locknuts?

I read nylocs can be good for 250lbft torque and must be used with SS, but not used on exhausts, etc.
Some say use nylocs everywhere instead of metal locknuts?
Opinions welcome!

Twins / 1971 A65L Drive side thrust washer
« on: 25 March, 2017, 15:34:46 »
There is a circular raised portion on the crankshaft for the thrust washer to fit over.
How high should it be?
I've a feeling mine is worn, the washer doesn't really want to stay put, which makes assembly of the roller bearing, etc. difficult.

Twins / 1971 A65L plain main bush
« on: 19 March, 2017, 16:17:56 »
I have two choices,
 1) use the old bush that is already fitted or
 2) fit a new one.

1) The journal is half a thou undersize giving .001" clearance with the bush. (top limit?)
According to the book a re-grind is neccessary when the journal is more than  .002" under.

2) Remove the old bush assy. and fit a new one.
How much would a new crush after fitting?
It may need machining.
What about alignment with the opposite roller bearing?

Any recommendations?



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