mercury mk3 piston

[1984]

clamped up a mercury mk3 piston in the lathe to see how true the thing runs, what garbage its way out the outer tube runs round like a buckled wheel no wonder the motorcycle industry couldnt compete ,are they all like this or have i a friday afternoon rush job.

[edbear2]

Hmmmm......try and repeat this with a piston from a 1908 bsa underlever......from when our manufacturing industry, science, rail network, army,navy etc. etc. etc. was the envy of the world!!!!!!!

0.001" runout max

P.S......expect a similar, but more eloquent, reply from Lakey esq. as well!!!!!!!

[Mike95]

Some of the later Meteor pistons look as if they were made from a tin can!
Reading a reprint of the 1912 BSA guide to rifles. The Lee Enfield bolt was made from a solid casting with 143 separate milling operations!! Those were the days.

Mike95