Help with a 450r

[05 rancher]

My brother is at work and im off today so he asked me to post this,so please bare with me..any help would be great.He took his 05 450R out yesterday and it ran ok,about 20 mins into his ride the quad like ran out of gas and cut off.Its started back up,and runs fine till you hit the gas,and then it dies again.he has some work done to it such as cams,revpack,full exhaust,jetted,ect.We took the plug out and it was fine,but we cleaned it up some,we ran it out of gas from idal,and then tried it again and it still did it,than we tried the gas line and started it for 10secs and let it run,and then we put the gas line on and tried it again,nothing......Also on monday he put new headlight bulbs in and thay are a little more watts then stock,could that be it.......We are stuck and its going to be a great weekend here in Nj !!!!! any help would be great.please help....Thanks Guys

[Buffalo400]

My 450r carb do the same thing in my 400ex...

My 450r carb run perfect when the motor is warm....

When he's hot, Idle is fine but when I push the gas JUST A LITTLE (the needle is still down), it die... If I pump the throttle, no problem..... only when It Idle a while, and i gentlly push the gaz, it die... I tried with a 48 and 50 pilot jet with the fuel screw and the bike didn't want run fine...

However, the bike doesn't die when my fuel screw setting was lean, the bike "pop" but don't die... So, i'm tinking to buy a smaller pilot jet, I'm going to order a 45 pilot jet...

Buy a bunch of pilot jet and try everything with the fuel screw.......


This carb suck, never seen that!

[05 rancher]

Thanks for the info......but the quad has been running fine,why would it just happen?

[speedfreaksguy]

It sounds like dirt in your pilot jet or possibly the main. I would pull the carb apart and clean it first.