Running in / did it seize ?

Information relating to the Matchless G80 or AJS Model 18 500cc Heavyweight.
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Joined: Mon Jan 01, 1990 12:00 am
Location: NORWAY

Re: Running in / did it seize ?

Postby bjorn » Wed Jun 13, 2018 9:21 pm

Trevor,
The hairpin valve springs are quite noisy and could well be your "whirring" sound if the engine is rotating without firing, i.e. no exhaust noise.

A check to see/hear where the whirring comes from could be done as follows: Find a suitable long downhill road stretch with no or little traffic. Turn off petrol tap! Take off spark plug cap and put it onto a "loose" plug taped or wired to the engine - must have earth connection to the metal. Original plug to remain in head of course! Engage 3rd gear, pull in clutch and coast till you reach a reasonable speed. Release clutch and listen to the noise(s) !

Bjørn

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