The Knowledge - Velocette Owners Club

emoving rust stains even on cloth, but chemists won't now sell it to the public. However a good source
is Teak Brightener/Cleaner which normally contains oxalic acid in enough concentrate for most tasks
(find in boats' chandlers or hardware stores- check contents on bottle)
#2306 The discoloration on the outsides of carbs, taps, & petrol things in general is easily removed by
using methylated spirits. As it evaporates quickly, apply liberally with a small piece of cloth. it is not
always fully effective on the internal parts. An old toothbrush is the obvious choice, but some electric
shavers have small bristle brushes, used for cleaning, an old one of these is good for getting into the
crevices.
L #2386 What does the number after the slash on a monobloc carb refer to? Say a 389/96. What
does the 96 refer to?
#2387 A code about the slide/needlejet/main jet that was originally fitted from Amal-factory.
#2388 So who has the code? Is it available? I see various motorcycle manufactures specifying say a
389/46 as original equipment. Is the code published?
#2389 Yes, an AMAL bulletin from the period will list all of the machines covered, and the specifications
for each one of the /numbers. Bruce Main-Smith and the usual suspects may have these bulletins. A
389/46 will have been fitted as: original equipment on BSA A10 Super Road Rocket, for 1960 & 61
using a 389/003 mixing body, 1 5/32" choke, 389/057 jet block, 420 main jet, 25 pilot, #3 slide, needle
in position #2, .106 needle jet, and tun less air cleaner. Date from AMAL list No. 601/3 for 1955 - 1961
motorcycles. Please note, any 389 carbs with a 1 5/32" bore, fitted with a 1 5/32" jet block can be
assembled to become the same as the 389/46 as manufactured. For example, a Matchless G80 built
between 1955 - 1961, was fitted with a 389/1 with the BSA sized mixing body and jet block, I.E. 1 5/32".
In this instance, the G80 carbs with only a few parts changed would work on the BSA A10.
L #2521 Does anyone on this list know where to get Gardner carbs, info, parts, etc?
#2522 Try Summerfield Engineering, they should have contact details or poss supply direct
(UK) 01773 835977
#2557 I have just arrived back from the Australian Classic Racing Championships and spotted your
request. You can contact Ron Gardner as follows: The Gardner Carburettor Company Limited 12
Slimbridge Road, Burgess Hill. West Sussex. RH15 8QE. UK Phone : (44) 01444233485
L #2864 Hello, I am trying to complete my Velo project. I started with a 59 swing arm frame a 68
endurance engine, I bought a thruxton head and intake new amal con. carbs. I bought the correct
pushrods, set up the engine for 9to1 compr. did the valve timing following advice from dave smith. He
sold the carbs to me and said it was jetted very close. I have converted to electronic battery ignition and
timed to dave’s advice. This carbs is a 1036 on body of carbs. I have a correct velocity stack on carbs.
Starting the bike is quite the project, when I do get it running it runs very rich I took the jets out of my
500cc bsa single and tried them in this carbs same thing. Any ideas would be helpful. Next problem oil
from engine fills the primary. I have Bought thruxton oil tank new lines filter conversion. I have very
good flow on return. In 5 miles of running it fills primary with 1\2 pint of oil. This bike project is driving
me nuts. I have worked on bikes for 30 years, I am a mechanic by trade and I always figured things out
this bike has me at a disadvantage. Any ideas?
#2877 Original Thruxton Conc 1000 series carbs should be R1036/4 (D Gibbison) Main jet 320, pilot jet
30, slide #3, needle pos #1 and needle jet 106. Common reasons for rich-running are incorrect idle
mixture and worn needle/needle jet. When carbs gets worn it also affects the needle/needle jet with
resulting rich-running at part load. Countermeasures are dropping the needle (step one), and replacing
needle/needle jet (step two). Check that carbs doesn’t vibrate which might upset the function of the
floater needle and cause high level/flooding.
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