Power loss on Suzuki LT250R

[XFactor45]

I have a 85 LT250R quad racer. It runs very strong low and mid range up to about 3/4 throttle. When cruising at 3/4 then going full throttle it starts to pull real hard then almost dies until I back off throttle to about 3/4 where it runs great. Bike hasn't been ridden in years. I have tuned it up, rebuilt carb, mixed fresh gas, cleaned air filter and changed the oil. It has plenty of fuel flow and starts easily. Just will not run past 3/4 throttle. Could use some help. Any ideals? Thanks for any help.

[fmftrx300ex]

its leaning out check to see tht ur main jets not varnished orgummed up and if not try a bigger jet. also be shur to check for carb boot cracks or crancase leaks

[XFactor45]

In my haste to get it running I didn't tighten the main jet and it fell off into the bottom of the bowl. Way to much fuel at full throttle.