MOPED ARMY

is it a ZA or an e50?

Squeaky whistling is often a head leak, squealing may be dry trans or stuck clutchparts, binding bearings etc. Usually crank and bigend bearing fails have a very grindy sound, it's a chunky not smooth surface rolling and maybe rubbing sounds like rocks in a tubler or griding things dragging. squeaks are a rotating part contacting and rubbing a static part.