What thread

[coop12g295]

Getting on to the last parts of the engine build and both it and my spare block(A series 1275)
have a threaded hole 1/2 way up on the back of the block that goes into the water jacket,seem
to remember m1000s had a drain tap but the mini should have a blank,its not unf so hedging bets
its BSP.

[mk1]

That hole is blind, it doesn't have a bolt in it. It was, I believe, for some sort of factory fixture.

[ivor badger 2]

If it's the 5/16" hole in middle of the rear of block, it was the Morris 1000 crankcase breather pipe bracket bolt hole.

[coop12g295]

I'll have a poke about,my 1293 has a blanking plug with a cooper washer,
must be overkill.thanks for the quick replies.

Ian

[woodypup59]

If its at the RH side (as you look at the back of the block) and halfway up, it could be the water jacket drain.

I have one with a lovely brass tap in it.

Its quite likely to be 1/4 BSP tapered.

[coop12g295]

Thanks to all and Woodypup that was my original thought so will investigate