Hi guys, I have an 08 yz450f and its time for a chain and sprockets replacement. I ride about 80 percent tight woods trails and 20 percent track. My gearing for the track is perfect with the stock 13/49 setup, but for the woods first gear is a bit too tall. I was thinking of buying a 13 and 12 tooth counter sprocket so i could switch them back and forth for whether i am at the track or in the woods. My logic is simply that the counter sprocket is easier to change, cheaper, and i wouldn't have to worry about needing a different size chain for every switch. That being said, i have read some bad things on the effects of a 12 tooth counter sprocket. My question is whether i would be better off with switching between a 12 and 13 on the front, or is that so much of a problem that i should be switching between a 49 and 52 tooth on the back?