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Discussion Starter #1
Got an 07 450er and it had a foam filter on it when I purchased last year and did'nt have any problems at all with bike but filter was old so i bought a new K&N as well as an outerwears filter cover for it. It has stock header with HMF silencer running with air box lid off and forget the main jet up larger than stock. After installing the new filter there is no performance issues accept it will stall often when slowing down from a hard run like stopping at the top of the dune or at the end of a mile race. Then it doesn't want to start, almost need to choke it to start it even when warm? Could it be running too lean with the new filer? Wouldn't have thought the change would make that big of difference.
 

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Did you forget a rag in the tube that goes to the carb like my buddy once did? Extreme example but look for any obstruction from the filter to the carb, did you fiddle with anything else?
 

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Discussion Starter #3
I guess i should take the filter off just to make sure, you never know lol. Other than changing out the filter, nothing else was touched.
 

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Things I would check for.

1. Check to see if your Fuel Cap is venting properly.

2. Check the flow of the Petkock Valve by removing the fuel line off the carburetor and turn it on should be a very heavy flow.

If those 2 things test good then Take a small flat head screwdriver with you and ride it till it dies and as soon as it stalls loosen that carburetor bowl drain screw to see if any fuel comes out you wanna see fuel come out with a nice constant flow. There should be a Small flat head screw at the bottom of the carburetor bowl.


If there is no steady stream or it's just trickling/dripping then you could have a clogged fuel line input screen or float needs to be adjusted... which requires you to pull the carb and take the bowl off then remove the float needle and then blow the compressed air through the opposite way that fuel flows into the float needle seat.


Also there should b a small plastic piece around the main jet that looks like a little sombrero hat it keeps fuel cupped in the bottom of the carburetor so that way when you climb hills and such it has a small reservoir for fuel to say it to keep the bike from stalling.
 

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And it could just be as simple as adjusting the idle speed screw, make sure that it’s set properly. Personally I would ditch the K&N and throw a foam filter back on there.
 
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