Quote:
Originally Posted by jpoole
I too have an '09 wr250x and my FE jumped from 62mpg to 72mpg when I started running without the airbox side cover! I had no other changes made and the bike was totally stock. I thought it was just 'cause it was new and breaking in so I put the cover back on and to my surprise the mileage went back down around 62. I went to a 48t rear sprocket for some low end grunt but the mileage dropped to 57ish. I put a 14t up front (with the 48t still on back) which should be a ratio somewhere between stock and where I am now and if it doesn't get much better, I'm going back to the stock 42t rear.
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with a 48t sprocket if it was 42 stock youre not right to lower the rpm at cruising speed ..
you need a smaller one at the rear . or bigger one in front