I am looking for some help here.
I have an 04 LTZ400. Yoshi Exhaust/K n N air filter.
Here is my issue. Bike starts and idles perfect, Takes throttle well until I guess about 1/2 throttle. Anything above 1/2 it bogs out, it does not stall but bogs as if it has had the fuel turned off. This happens while just sitting in the garage or out on the trail. If you play with the throttle the whole time, its much better. Almost normal, but if you hold it at or anything over 1/2 throttle it bogs out like its run out of fuel or been shut off, then after 3 seconds it takes back off then bogs again.
I have read about these issues on here and have tried as many things as I could.
-Tried with fuel cap off ( Same thing)
-Changed spark plug ( Was black and sootie)
-Tried with no air filter at all ( Same)
-Adjusted Air/Fuel scew ( 2 1/2 turns out) ( same)
-Check fuel petcock, seems to be working as it should, if you suck on the line going to it fuel streams out o in the On or Res position, and always runs on the prime
-Choke cable seems to be moving well not pinched and works well when starting on cold morning.
Please help, its my sons quad and it would be nice to have running correctly.