I am new to TT and very impressed by the members and information available. Great resource as I got an '08 DR-Z400 SM a month ago. A return after 22 years of not riding. Anyway here is the question. The bike is stock with factory sprocket and all. I put the bike in 1st gear, pull the bike back until the chain is taught, and mark the spot on the floor where the tire makes contact. Then I push the bike forward until the chain is taught again and mark the spot. The 2 spots are 3 inches apart. Chain is correct (40 mm per manual) and also looks OK when I put 2 people (300 lbs) on the bike. Is this much slack/play nornmal? If not what could possibly be wrong? Thanks for your help.