Been working on this sportsman 400 and I can't seem to find the reason it's bogging if I hold the throttle for 20 to 30 seconds it'll open up for a bit but the second I let off it bogs I've check the oil pump the carb and the reeds and I can't seem to figure it out any helps appreciated

 

We have the information you seek on the ATV Connection homepage here:

https://atvconnection.com/articles/a...ve-a-bog-here/

 

Thank you for the help I'm pretty disappointed in myself for not realizing sooner especially after pulling the carb apart three times the main jet was missing got a new one and it runs like a dream