No low-end Power...help!

[Atreyu]

After a long day of riding, my quad will not wheelie at all. It has no bottom end power. It was fine all day and just started doing this. Could it be the clutch? Or maybe compression? Any help would be good...thanks.

[sled_ed 300ex]

Did the temperture change at all,some times if its cooler at night maybe theres not enough air coming in.

[Greg Z]

air leak?

[Atreyu]

Checked for air-leaks..didnt find any.

[pnut420]

Its hard to tell what you mean by no bottom end, is it running real bad and sputtering or is it just lacking power. It could be alot of things, valves might need adjusted, rings are going bad.

[Atreyu]

Lacking power. Runs fine

[stonerider250x]

is it smoking any

[adrenaline]

mines been doing the same thing...like it runs fine no sputter or smoke or anything..but all low end torque is gone..it used to be hard to keep the front end down now it stays down..(well i wont say it stays down but its not the same doesnt come up as much) and theres no torque..i was riding with another 400ex hes stock mines jetted, wb slip on, and k&n...he took me fof the line..idunno im thinking my valves need to be adjusted? if u find out whats wrong with your let me know man..thanx

thats really wierd what kinda terrian were u riding in? try it tomorow after u get home from work/school and see what it does.

[Aceman]

Check your valve clearance and compression test your quad. Squirt some oil in the spark plug hole and compression test it again, if compression comes up significantly you need rings.