125-130 lbs
The KTM 50 SX Junior is 23 inches, the 50 SX Pro Senior is 25.6 inches.
KTM 50 tops out around 50-52 mph my 06 ktm 50 hits 55-60mph
85 mph
As far as I know, there is no adjustment.
about £1400
You can find that info , as well as a lot more, here: http://motocross.transworld.net/2003/07/09/2004-ktm-125-sx-200-sx-250-sx-and-525-sx/
The sx is for supercross.
In the center of the head (on top of the cylinder).
under the gas tank
A KTM 65 SX should typically have a compression ratio of around 12:1 to 14:1. In terms of actual compression pressure, it can range from 120 to 150 psi when tested with a compression gauge. Maintaining proper compression is crucial for optimal performance, so ensure that the engine is in good condition and that the piston and rings are not worn. Regular maintenance and checks are recommended to keep the compression within this range.
The KTM 360 SX is still a good bike, like all other KTM's dependable but parts are expensive when you need them. Here is a link that has pictures of the 360 SX: http://www.bikepics.com/ktm/360sx/
Stock, in the ballpark of 48-50 hp