Look on Google images. Lots of photos of Yamaha Majesty trials bikes.
But the biggest tell is the quality of the brackets & welding on the Yamaha frame. If it looks like other Japanese production frames it's a Yamaha. If it looks like it was lovingly built by a craftsman it's a Majesty.
Here is a link to a litte bit of video shot at the Trials Park, https://www.youtube.com/watch?v=egXbhgsnhrg There are sections/ground to suit all abilities from beginner up to world PRO class.
May be a bit far for you. But the Trials Park, Corton, Suffolk. is great. It's right on the east coast between Lowestoft & Gt Yarmouth. Camping ground for £5.00 a night, Ride for £10.00 per rider per day.
Half way up the window when the bike is upright and on level ground is correct. As for water use, remove the radiator cap when the engine is COLD and check the level. you should be able to see the coolant in the radiator head/ bottom of the filler neck. But it shouldn't be filled right to the top. Leave an air gap.
Look for a camp site in the local area. Camping on site is ****. No Showers, toilets unusable after the first day, people tearing round on mopeds and scooters all night. All for £20.00 a night. They can keep it! We will be staying else where
Regarding gearbox oil, Beta recommend SAE 10/30, 550 cc. I however have been using a good quality 5/30 oil, about 500 cc (half way up the sight class with the bike upright on level ground) as I feel the 5/30 gives less clutch drag from cold.
Yes oil the air filter with filter oil as it is helps catch any small dust particles.
I would imagine that there should be at least four if not five steel plates in your old clutch pack. Also the bottom friction plate in your photo looks like it's coming apart. As it has lost one of the pads of friction material. As your in the USA have a look at,http://www.bultaco.com/index.html May be a better source of parts for you.
The ones on the right (all steel) aren't a full set. It should be an equal number of the two types of plate that you have there. Also those plates look pritty worn out especially the third and fourth ones down .
I don't state that it "Gets Thicker" I state the a 75w oil IS thicker at temperature than a 40w oil. The polymers in modern multi-grade oils counteract the thinning caused by heating allowing an oil to ACT like a thin 5w oil when cold and a 40w oil when hot.
Lead in gear oil? The point of highest pressure/stress in an engine has to at the big end bearing on the start of the power stroke. All the Power on one bearing with no reduction what so ever.
Beta recommend BARDAHL 10W30 oil for the Evo, which is basically the same engine as the Rev.
I have been using a high spec 5w30 as I find the clutch drags a bit less from cold. I have also found that gear changes are smother & more positive now than when I was running a 75w gear oil.
The 15w/40 should be OK for a ride or two. But the clutch may drag a bit from cold
Oil viscosity is measured by weight, hence the W in 40w so 75w oil is actually thicker at temperature than the 15w/40. A multigrade oil acts like a thin oil when cold and a thick oil when hot. I.E in this case 15 weight Cold / 40 weight Hot.
I used to use Putoline 75w gear oil but have switched to 5w/30, Beta recommend 10w/30 oil.
You will find that the gear change is a lot smother with that than 75w gear oil.
A lot of what makes them special to me is the fact that no two are exactly identical. Be it paint colour, a hole drilled slightly out, tool marks on a casting or a weld that looks like the welder just returned from a heavy liquid lunch.
It's the individualism of each and every bike that is fascinating in my opinion.
and this is what a standard Bultaco one should look like.
I would suggest that you weld a piece of steel on the end of yours for your toe and keep an eye on the on-line auction sites for a standard one. (they do pop up from time to time).
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Over here in the UK/ Europe a lot. If your on face book post up some photos on the Bultaco group. facebook.com/groups/5469154239/
http://www.inmotiontrials.com/bikes/bultaco-astro-flat-tracker/
http://www.inmotiontrials.com/bikes/bultaco-matador-mk4-1972/