Thread size and pitch RT Desmo decompressor

[IanHood]

Does anybody know the thread size and pitch of the decompressor hole in a 450 RT Desmo head? I don’t want to use a decompressor but need to find a suitable blanking plug.

Ian

[LaceyDucati]

Ian

M10 x1mm the same as a 10mm spark plug.

Nigel

[IanHood]

Thanks Nigel - so I’m thinking of using something like this with a copper washer. That should be fine I assume.

[IanHood]

…and by the way Nigel, I received the springer head back today. Here’s another advertisement for you - a lovely guide and valve job but I would defy anyone without a microscope to identify where you carried out the welded repair to one of the valve cover bosses. Outstanding work!

Ian

[LaceyDucati]

Ian

Glad you are pleased with the work and thanks for your kind words.

That plug should work. It will leave a small recess in the chamber, but as long as it's no worse than a second plug or decompressor, I'm sure it won't cause any issue.

Nigel