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Discussion Starter #1
I have an 2008ltz400. I have recently had the jets changed and everything worked great when I got it back. I got a new air filter, took the air filter cover off, bought new thermal switch and fixed all wiring Issues. It will lose power a lot when givin a lot of throttle or will even die off. Sometimes it’s very hard to start even when it’s warm. It will not let me go full throttle it just cuts out. But sometime it doesn’t do that somtimes it will work fine but still have a little loss of power. Anyone have any ideas of what it could be. Thanks
 

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Is is jetted to have the air box lid off? There's a big difference is the proper jetting for the lid to be on or off.
 

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What jets are in it? How many turns out on the fuel screw? Sounds like something might be dirty in there. Just for snicks I would try a new plug, and do a compression test while I had the tank off.
 
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