motor issue

bike is an 08 outlander 800 xt. it has a programmer, hmf pipe, clutch kit, extreme belt, & 30 in silverbacks. problem is it runs about 3-4 hrs them it’ll lose power & wont pull. won’t even turn up enough to lock up clutch. after last ride it would run 40 min & have basically same issue. checked fuel pressure & at 45 min mark it would fluctuate from 20-45. changed fuel pump now it runs 3-4 hrs. wtf any ideas besides buying a real bike

motor issue

bike is an 08 outlander 800 xt. it has a programmer, hmf pipe, clutch kit, extreme belt, & 30 in silverbacks. problem is it runs about 3-4 hrs them it’ll lose power & wont pull. won’t even turn up enough to lock up clutch. after last ride it would run 40 min & have basically same issue. checked fuel pressure & at 45 min mark it would fluctuate from 20-45. changed fuel pump now it runs 3-4 hrs. wtf any ideas besides buying a real bike