I just bought a used KTM SX 150 for my 15 years old son. He wants to go riding with me in the woods and trails (and maybe some enduro racing) but it was virtually impossible to find a 125/150 cc "enduro" used bike for him (well yes, but, a new the Husky TE 125 for 7,000 US$ plus...too much money!). Anyway, I bought a used KTM SX 150 and my project is to adapt it as much as possible for trail/enduro riding. I was thinking to re-gear it from 14/50 to 13/52 (thus increasing the gear ratio from 3.57 to 4, almost half turn) to increase the bottom-end. Then I plan putting a flywheel weight (8 oz) on the rotor. The idea is to make a much more friendly engine for long rides. I may modify the front suspension, but I really don't know what to do there as "suspension" always has been a sort of "black science" to me. I would be very grateful for your comments and tell me if in your opinion I am on the right path and if possible, give me some guidance on what to do with the front suspension. Thank you!