I agree that resto-modding rather than restoring
might be the only practical way to get this beast back on the road.
Lorenzo, you've seen the pictures of my 350 Bullet, it is a 1961 model, originally with the same 17" rims as used on the MM. A previous owner converted it to off-road specification and had a 21" front rim and 18" rear rim laced onto the old hubs. This does indeed raise the bike overall, though more so than would be the case for this MM if Mike were to fit a 19" wheel. The PO's solution was to have alloy blocks welded onto the centre/center stand to restore clearance. I kept these wheels (or at least the rear one and the 21" rim from the front but with a different set of forks which raised the front end a little further (more on that shortly) which meant that even the alloy blocks weren't enough. The answer then was to fit an Indian Bullet centre stand (along with the Indian side stand for personal preference, Hitchcocks have a kit with all the parts for this).
You can get various length fork stanchions. The Redditch factory fitted 1" longer for 17" wheel models, MOST Indian forks will be the correct length for 19" wheels. However my 350 came with a very early set of Enfield India disk brake forks which were shorter even than normal Indian Bullet forks. Fitting a set of the latter resulted in the fitting of the Indian center stand above.
Yes, the 17" front mudguard/fender won't fit over a 19" wheel, so use the fender and stays for a 19" wheel. The rear fender has more clearance, I think, so converting that to an 18" rim should be feasible. An 18" rim on the rear and 19" rim on the front will give a far better choice of tires. For the redundant speedo drive boss, new speedometer drives from India are cheap enough, I'm using one as a blanking plug! Probably best to stick with the rear to drive the instrument. If Mike still has the original Smiths chronometric speedometer it will need a rebuild most likely, and it can be re-calibrated to suit any increase in rear tire size while it's being overhauled.
Azcal, (and Mike) a word of caution regarding top yoke/triple trees, I suspect the existing ones are probably re-usable. If not,
beware of fitting a post 2002 Indian triple tree as they changed the steering stops and steering lock. Trying to fit one in a Redditch frame does this.
Also be careful with forks from India as plain top versions won't fit screw-in top yokes. The set I linked to earlier should be fine.
A.