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91
British Bikes / Villiers centre piece carb MKII: internal dimension?
« Last post by Albion EJ on August 09, 2025, 06:15:53 PM »
Hello everyone I do have a MKII carb (1 1/8”) fitted on my 148cc XIIC engine and do have several centre pieces as option.

I do have 2, 3 and 4 (smallest).

Does anybody knows the internal diameter of these centre pieces?

Thanks!
92
British Bikes / Re: AJS 16M 1951
« Last post by dynamic on July 30, 2025, 08:55:55 AM »
thanks all for posting I will update on prognosis
93
British Bikes / Re: AJS 16M 1951
« Last post by john.k on July 30, 2025, 03:03:15 AM »
Most likely cause of jamming is burred first tooth on the starter quadrant .......first meshing tooth should have a sharp point .....when it gets burred ,the traditional cure was to grind it off and sharpen the next tooth...........ditto the mainshaft ratchet gear ...it should have pointed teeth ..........I d also add ,you never stab at the pedal,mesh the gears first before applying pressure ...........The 1956 on  AMC box has the Norton style kickstart with a sprag engaging an internal rack ......reliable and near abuse proof.
94
British Bikes / Re: What is this BSA Frame??
« Last post by john.k on July 30, 2025, 03:00:13 AM »
Ive collected lots of M20 and M21 motors to make a Gold Star style OHV  motor and fit it into an early Kawasaki frame I have ........but ,at my age , reality has finally struck home ......no more bikes for me ....enough already.
95
British Bikes / Re: AJS 16M 1951
« Last post by Rex on July 29, 2025, 07:10:55 PM »
Or is it timed on the compression stroke?
96
British Bikes / Re: What is this BSA Frame??
« Last post by peteR on July 29, 2025, 04:02:21 PM »
Quote from: cardan on July 29, 2025, 12:26:10 PM
Hope your friend wasn't expecting more... a bitza can be fun but very disappointing if it's a surprise.

Leon

Thanks Leon, I think he always realised that it was neither one thing or the other, but the extent of the variety of models included has come as a bit of a surprise.  Interestingly, the log book shows it was first registered in 1934 as an M21 (i.e. 2 years before Val Page joined BSA and designed it!)

P
97
British Bikes / Re: What is this BSA Frame??
« Last post by john.k on July 29, 2025, 01:57:56 PM »
The toolbox is correct for the plunger frame ,its odd its mounted cockeyed .........BSA had the forge shop to make the frame ,a part of their heavy weapons plant..........BSA also drop forged the flywheels ,even the lowly side valves had forged steel flywheels........in fact you can make a very capable OHV from a BSA M20 or M21.
98
British Bikes / Re: What is this BSA Frame??
« Last post by cardan on July 29, 2025, 12:26:10 PM »
Hope your friend wasn't expecting more... a bitza can be fun but very disappointing if it's a surprise.

Leon
99
British Bikes / Re: What is this BSA Frame??
« Last post by peteR on July 29, 2025, 11:37:39 AM »
Thanks guys.  I have managed to find the frame number hidden away.

The frame number B3-593 from a 2.5HP 1934 BSA Blue Star 250c.

Agree that the plunger section is probably from an A or B series.  The forks actually seem to be C15 and the front wheel is Bantam D1 with the smallest brake imaginable!

Other than that, it seems to be just as it left the factory!
100
British Bikes / Re: AJS 16M 1951
« Last post by john.k on July 29, 2025, 11:06:43 AM »
The CP Burman boxes dont normally chip gears ,as the gears are quite soft to avoid breakage ........the worst can happen is tooth breakage caused by worn layshaft bushes..........good news is millions of these boxes were made in WW2 ,and NOS parts are cheaply available .........be aware though there are several changes in the whole gearset made in WW2 to meet criticism of too wide gaps in the ratios............In general ,there are prewar trials ratios,post war trials ratios,and standard road gears.
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