i have a 02 400 ex and the chain is loose, and keeps slipping off. im trying to figure out how to take out links or tightin it. so if you have any suggestions please help. thanks

 

So I suppose like everybody else on the planet you don't have an owner's manual??? If you bought it used without a manual, that tells you something about how much the previous owner didn't care about maintenance! If you lost the manual yourself, well then I'm the fool for helping you out....

The chain tightening procedure is outlined nicely in the manual, and it's real simple. If tightening it doesn't do it, then you may need to take out a link, but if your chain is stretched that much, it's probably more than time for a new chain and sprockets anyway.

There are four hex bolts at the rear of the carrier. Loosen them. Just inboard of the rear sprocket there is a collar. You rotate it forward to loosen the chain, and back to tighten the chain. One of the large C-shaped tools for adjusting shocks works really well for this. You want a little slack in the chain, like about 30 mm. Then tighten the bolts back up....it's that simple!

Best to think of chains and sprockets as disposable items. If your chain has been falling off, no doubt your sprockets are all chewd up anyway. They do need to be replaced from time to time. I do mine every year or so. It's good insurance against getting stuck out on the trail somewhere with a broken chain!