My 450r has a stock airbox lid and a k&n air filter and it bogs out bc of not enough air flow. I put 5 air vents in it and it still isn't getting enough air. I got 6 more vents should I put them in the lid to or does anyone have any other ideas? i thought about the k&n power lid but someone said that it still allows water into the box and i dont wont that. Could this solve my problem? By the way it has never been jetted. Thanks

 

If it's never been jetted, try going back to a stock lid. Sometimes it's the velocity of the air that matters, not the volume. And you'll get a ton more velocity with the lid back on and no holes in it because the air is restricted to a smaller intake hole. So, the air moves way faster. Just tape the holes shut and try it. It's worth a try and cheap to do. Made a huge difference on my 250X. When I bought it, the guy before me had a big hole cut in the top of the lid. I closed it up and that thing took off like a bandit.

 

Yeah, if it's stock with a k&n and it bogs I seriously doubt it's because of not enough air flow.

 

then what could be causing it to bog out?

 

Well, if it's too lean it will have big power losses that could feel like a bog. Occasional back firing is a common symptom of being lean.

Most 450's run slightly on the lean side from the factory. I just don't see you running rich especially after you've increased air flow to a stock engine. Most all recommend a larger jet (more fuel) to compensate for the extra air your giving you quad with the K&N and holes.

 

sounds like high speed jet stopped up , clean the carb thoroughly and try the lid the factory way..... my 75 cents.