Some Help PLEASE!!!

[KEVIN300A]

I have a stock 04 450r and the quad starts up first kick and idles great. After 1/8-1/4 throttle it wants to quit. It was running excellent and just recently did this with no changes to the quad...

things I tried: cleaned the carb and air filter, changed the plug, changed the coil, changed the comp.... I am pretty lost any ideas would be great.... also checked the valves and adjusted... It is not losing ignition that was also checked thanks in advance

If you have a friend with a 450R I would try his coil. Maybe yours is weak.
Also take the rear boot off the carb and make sure the needle is coming up when you give it throttle.

[warr72]

Check for cracks or leaks in your intake. Also maybe a dose of bad gas, as I had some bad gas and did the samething in my 08. I also had to change a headgasket on an 05 that had pretty much same symtoms.