classic motorcycle forum
Motorcycle Discussions => British Bikes => Topic started by: Frankie J on November 01, 2020, 02:10:12 PM
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I have a Triumph 350cc 3TA engine, 1961, and have found a 1/4 BSF threaded hole in each of the rocker boxes and I cannot fathom out what they are for. The wall thickness is only about 1/8 ins.
Has anyone got an Idea what they may be for?
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where is your 'ole and how many? sound to me as if the lower studs are awol
as here.https://www.vintage-motorcycle.com/en/parts/triumph-used/rocker-box-usedtriumph3ta5tat100at21-1
it'll be whit thread not BSf unless its been bodged, likely.
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Possibly someone tried to fix some sort of vent to each one. They do tend to be leaky if pressure builds up due to worn valve guides etc.