My Yerfdog is identical to yours-05 model ,no reverse (bought mine as a basket case and rebuilt it) The BX125 is an 05 as well. Once again the sprockets are "identical" other than the tooth count. It would make no difference with the motors anyway as this was a direct gain on the same engine and machine so we know you can get a 16 tooth sprocket for your Yerfdog. I don't know how fast the spiderbox was with the Howhit -I didn't run the GPS on it till the motor change just to prove to my wife that it was faster with the 16 tooth than the 13 tooth. And I think I've already found a supplier with the 15 tooth for $20. I can't really tell much of a difference on the bottom end as it still climbs the same, It does feel like it has a better mid-range now as that's the rpm's most used when running our trails.
Ckau do you know how fast yours is with the stock 13 tooth sprocket in mph's?
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