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I had not noticed this thread.
Some do go metric but that becomes a pain latter on when some one else gets their hands on the bike.
Helicoils will be fine just use long ones.
For head bolts you should be using 2.5 or 3 d
The length of a heicoil is defined by the diameter of the thread so the cone in D, 1.5D , 2d , 2.5d & 3d
For head bolts you really should go 2. d or better.
They can be done by hand with a normal power drill & hand tap as you are effectively drilling out the hole 1 size larger and the drill will follow the original hole well enough and the wire is a sloppy fit on any thread profile.
However you do need to be careful when you start the tap off to make it nice & square.
IF you have an alloy head then 20 to 25 ft lbs will be fine, any more will collapse the holes around the bolt making it very hard to get off.
If the head is iron the 35 to 30 ft lbs.
If you must go metric then make sure you use metric coarse threads as std metrics are a bit fine for anchient alloy so you are looking at 1.25 or 1.5mm thread pitch.
And if you are going metric you may as well jjust drill & tap for the next size bolt rather than drilling a even bigger hole for the helicoil
Shane & Trevor have just come back from test riding this run.
From Tench Reserve to Springwood then on to the siding will be 1 hour 15 min with a catch up at the Hawkesbury Rd lookout.
From Springwood it is all 50 Kph so suitable for small bikes.
The Lapstone route will go about 40 minutes and is all 50kph
Return is 20 minutes
So perhaps a tiddlers run ?
Sorry, I did not read your post properly.
BSA never made a 4 stroke motorcycle with a spline on the kick starter. They are all cotter pinned similar to on a push bike.
A would be supplier of aftermarket & pattern parts in the UK < http://www.classickickstarts.com/kickstarts-bsa-b-series-engines.html> does a line of splined quadrants and kick starters but they were not particularly good as he had them cast not forged.
I am not sure if they are still in production as they got quite a bad reputation for fracturing when jumped on instead of being kicked carefully.
They have no agency in Australia due to the above and the very high price of making anything in the UK.
I would strongly suggest to contact Mark Cook at PES
< http://www.ccm-britain.co.uk/?xhtml=xhtml/homepage/default.html&xsl=homepage.xsl > he makes a wide variety of upgraded unit single parts and is a BSA unit single expert.
The $ is reasonable against the £ at the moment so Mark can organise a lots of nice chrissie presents for your B40.
He is an enthusiasts married to the daughter of the designer & manufacturer of CCM motorcycles.
They are always happy to help out.
He also haunts the B50 forum
if you fell more comfortable approaching him that way.
also lurks there a bit and if you really want to empty your wallet Stan ( Hp by Stan ) Ed ( E&V Engineering ) if you want a 100mph + B40
- This reply was modified 6 years, 12 months ago by Trevor.
MikesClassicSpares.com ( I think ) will have them in stock.
Remember to use the valve lifter when starting.
It is not there for wimps, it is there to take strain off the staring system.
Now that I can see where to type a reply it seems to work out ok.
Also checked out the “lost password” function and it seems to work OK as well.
These box borders are nigh on to invisible on the I mac.
I don’t see any way to start a thread on my screen
Something I don’t know about TYPING.
Have edited the original post to 1965 as it should have been.