Hi Andy

Many thanks for such a prompt reply very much appreciated.

Yes apologies I wasn't as specific as I should have been for the following reasons:

1) My son has put a MC21 Engine in his MC18 R5 (no Generator, Flywheel or Carbs) and was having a bit of trouble with the Generator and Flywheel, the MC18 generator was loose as the screws had bottomed out on the MC21 Crankcase and the Flywheel had been lost, however, now after a long search it has reappeared today (Bike been in total bits for 20+ years plus a move and I had promised to put this query on some time ago).

So I take it in the shorter term he could use all the MC18 R5 flywheel, generator and matching pulser coils and either shorten the Bolts or put some spacing under them as he just wants to get the Bike running initially and MOT'd? But afterwards source MC21 flywheel, generator, matching pulser coils, PGM-III Unit and carbs to get the required balance and performance.

2) For my own part I am planning a project to transfer the bits from my existing MC18 R2J to a set of MC21 Crankcases and MC21 Crankshaft & Conrods and was just going swap all the parts across.

Hence why I was so vague, so once again apologies I probably should have put this as 2 seperate questions.

Many thanks

Phil