Heads had been milled (translation to British: skimmed) .040", too much compression for our E20 pump 91 octane gas and so it seized the left side. Note new pistons, bored .25mm over (64.25mm) genuine Yamaha parts. Keeping it all stock as possible, lovely low end torque. Fix for heads was to use additional head gaskets, put it right back to stock.
RD400E rebuild time
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