Jetting problems

[fatboy666]

Lately my 450 has been sputtering and breaking up. I hit a few jumps today and when I landed it bogged way down. I don't think it was jetted right.

My motor is bone stock minus a DMC alien exhaust with air box lid on. Tried to take lid off and it ran terriblee. It's got a brand new plug in it so that's good as well.

I live at sea level here in south jersey. Anyone tell me what size jets I'm supposed to have?

[Ichoptop]

Did it start doing this when you did the exhaust? or has it been doing this the whole time or maybe a gradual build up?

If it just started without mods then its not a jetting issue...
if it has always done it then it may be.

little more info please.

[fatboy666]

I bought the quad already popped and jetted. It doesn't do it all the time, but when it does it's noticable. I read something about running them with it on reserve helps and I just took it out out and tried that and seemed to help a little bit.