With the brand new 019 battery in it is exactly the same. Cranks slowly for the first couple of revolutions, you release the key then have another go and it spins quickly and fires. Guess I'm going to have to buy another starter and send this one back for a warranty claim - what do you think the chances are of me actually getting any money back....
:/
depends on who you bought it from
you've tried everything else, so it does seem you got unlucky.
another thought, have you tried turning the crank by hand with a socket and bar? just to make sure it isn't really hard to turn over for some reason.