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I'm new to scooters so bare with me. I recently put in a new K&N air filter in my 08 400. I read somewhere that some (air/fuel) adjustment needs done to regulate gas consumption. Is this true and if so how do I go about doing this? I'm asking because it seems like my MPG has DRASTICALLY decreased since installing the air filter.
 

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Go on a DIET...............!!!!!!!!!!!!!! :lol: :lol:
 

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there are no adjustments , the computer does it all, what you probalbly have is a mif maintenance induced failure, whike you rere farkling with it, doing something suzuki didn't get paid for, you may have dropped a tiny bit of cut off filter or plastic or some other kind of detritus down in the feed me air hole and now it's not feeling so well as before , if you fix something and now it's broke, the first place to look is where you fixed it
 

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The mix is controlled by the ECU and monitored by the O2 sensor on the exhaust pipe,
it can be altered by using a computer program your dealer may have it, or by http://www.dynojet.co.uk/index.php/splash
or something like it, a cheaper and much cruder way is to get a adjustable o2 eliminator that is only really a adjustable resistance
that modifies the O2 output and fools the ECU into running the engine richer or weaker, but to be honest I doubt you have a problem
and would fill the tank and do a mileage test to be sure.
 

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Discussion Starter #6
v8eyedoc "Go on a DIET...............!!!!!!!!!!!!!! :lol: :lol:"....THAT is probably it! :oops: :lol: :thumbup:
 

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If the K&N filter makes the bike louder, this might be a psychological thing- running it harder because it sounds cool?
The only way to find MPG accurately is to keep a running tally- I made my own spreadsheet- after several fill-ups you will be able to get a good picture.
Plus I fill up each time, to make it easy. After several tanks, which eliminates overfilling sometimes or underfilling sometimes, you can get an accurate MPG.

Personally I would not run K&N. You can clean the stock filter with Simple Green many times.
I ran K&N in my Shadow because the non-cleanable paper filters cost as much as a K&N. And I was living in NW Arizona (the dusty desert) so a reusable, oiled filter made sense (cents too) :)

But others have stated that K&N allows more air to flow = larger pores = more dirt in engine.
 
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