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On Thursday, 10 September 2009 11:45:08 UTC+1, robert wrote:
Have acquired an old pedestal drill with a
British Houston Thompson single phase 1/4hp motor
marked KF TD3205 type BS 2408

The motor start capacitor needs replacing but it has no visible markings
on it due to several paint coatings !

With capacitor removed the motor will run with a hand start and I can
hear what I assume is a centrifugal switch clicking on spin up and spin
down.

Any advice on what size capacitor to buy and try ?

I have one of these motors and it does not appear to have a capacitor on
it . It starts but dips the lights in my workshop as it is pulling a few
amps on
start up is the capacitor internally mounted?

There are various designs, some with some with a capacitor, some without.
Induction motors inherently have poor starting torque.

The ones with a capacitor are marginally better and hence will start against
a amall load/run up to speed quicker.