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"Size of what? chainwheel, crank length, Bottom bracket spindle length? Not possible to say in any case, as manufacturer specs can change, even in a model year. Take to a bike co-op or bike shop for advice or search online for "replace crankset".
Depends on the part. Lots of maintenance parts are available for older Yamaha units but no dealer is going to stock them waiting for someone to walk in the door looking for 35 year old parts for everything Yamaha ever made. That's what the big Yamaha warehouses are for. Call your local dealer or try Rock River Powersports in Wisconsin, they run Yamaha's MX racing program. If they can't get it, it's not available.
The "hubs screw is called an axle, and you did not really ask a question. Unless you want to depend on the pegs to hold your wheel on you will need to get a longer axle and take apart the entire hub to replace it.
impossible to tell you without knowing the bike brand and model and year, although you have provided that 1999.
If you take into a bike shop, which is the usual place to purchase the parts you need, they will be able to tell you what size Bottom Bracket will fit your bike, also what options you will have for replacement cranks and bottom bracket. This could be a very complicated issue when replacing with parts that are 11-12 years newer, the shop will be best equipped to give you all your options.
Can you explain why you think the tires are too big? Do they NOT fit the rims? What condition was this bike in when you bought it? If the brake pads line up with the rims then the wheels are correctly sized for the frame.
Is the clutch lever sized or is the plates sized?
Usually the plates inside sizes, all you have to do is select gear 2 or 3 without starting the bike's engine,operate the clutch lever and push the bike,it should release, the rear wheel should now rotate freely with clutch lever in operation and in gear.
Hope this helps!