Maintenance & Technical > KX450F / KX250F

kxf450 vs kx500: Fuel Consumption....

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sintax:

I'm kinda planning out my next bike a season or two in advance. I am wondering if there are any KX5 converts that are running newer 450's (08 09). Looking for an honest feel for how they compare on fuel consumption, esp on one of the new EFI bikes.

Anyone have any input?

KXcam22:
This is not a very scientific observation but I have been riding my 07 450 on the same trails and terrain as my KX500.  I find that the fuel mileage is about the same, not a huge difference.  If anything the KX might get a bit better mileage but thats only a gut feel.  The 450 needs a larger tank, but so far I have not run out.  Hope this helps. Cam.

gwcrim:
Theoretically, the two stroke would use more fuel.  It fires every revolution vs. ever other of a four stroke.

GDubb:
The only modern fourstroke that I have ridden was my friends fourtrax 450R. I was hitting the rev limiter constantly (wishing it would rev like a 2stroke) which I would assume is sucking alot of gas being wrapped out all the time. I dont know if riding a fourstroke BIKE would be the same but on my K5 I spend most of the time in mid range rpms or low rpms in tight woods so it probably does decent on fuel consumption. Only time I have ever had room to really go WFO is at the dunes where I would assume the K5 would guzzle some gas. Are bikes like cars where they design them to go a certain distance on a tank of fuel and size the tank accordingly? Probably not but just wondering out loud.


-G

jfabmotorsports.com:
This definitely isn't scientific either. 2002 kx250 2.2 gal, 2008 kx250f 1.9 gal, 2009 kx250f 2.1 gal. I looked the 250's up because they are primarily designed for one reason, motocross, unlike the 500's, with huge tanks, that got used for everything except motocross. So I'm thinking Kawasaki designed the 250's to go about the same distance on a tank of fuel....30min +2 laps. It's just a thought.    JFAB

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