That was caused by 2 things , slightly flat landing the jump ,you should be landing on the down face , you were not far off landing it in the right place , otherwise your over jumping that jump just a bit , but it was not the impact killer , the 2nd and main reason is because you are not back on the throttle right before you land , if you land OFF the gas , the bike will blow thru because basically all the weight is hitting the ground from UP , basically like you standing on a table and just jumping right off the edge , you hit the ground with ALL your weight and all the force from that fall
If you were back on the gas then the forward momentum will absorb some of the impact , because the force is now distributed between landing and moving forward , basically the same if you were on that same table , but instead of just jumping off it , you ran up to the table and used it to launch yourself off it , landing farther away on a angle instead of just down or dropping like a heavy rock , so the impact is lessened and you continue on your merry way ....make sense ???
What your goal is , is to be able to jump all the jumps on the track and on the largest its ok to bottom or slightly bottom (if the jump is 50+ ft , but not on a smaller one like that), but not from a technique caused issue , this was caused by technique , or lack thereof , watch MX videos , and listen carefully when the riders land , they are on the gas just before they hit the ground , this will take some practice to make it a subconscious decision , instead of a forced decision , but in the long run your landings will be softer/smoother and your speed will improve
If you would have backed off slightly before hitting the face of the jump (never back off the throttle when on the jump face , , but on the flat before , especially on a 4 stroke , otherwise , it will be a ride you will never forget , and you will find out what a ENDO really means) , if you backed off slightly and then landed on the down side while accelerating , you would have rocketed away , and hardly felt the landing at all
Also do not forget a 250X is heavier than a 250R ,by quite a lot , so its not going to land as gently as the lighter bike will , because the mass is more so the force of the landing will be more , and momentum will be the key to a softer hit , more so than on a R
It would be like your kids jumping in the water , and you doing it , who is going to make the bigger splash ?? , you will because of your weight/mass compared to the lighter child
Weiser , Idaho