stick a screw driver in sprocket hole into the slits cut for tightening loosen the two bolts and jerk ATV forward
you can tighten the actual chain but that may be hard to do. my advice is that there shoulbe be some bolts in the swingarms that holg the axle in one place loosen them and move the axle back until the chain is where you want it
how do you tighten a chain on a 150 ATV
you shorten the chain links
you shorten the chain links
250x is a 4 stroke. The only 2 strokes Honda ever made were the 250R ATC and ATV.
It has an automatic chain tensioner..
It's not too bad you need to get the engine at tdc and then check the flywheel marks through the timing hole. Check out my bio page for help.
I would either talk to my local Honda shop (most shops are pretty cool about helping out someone with a little bit of info-just don't overdo it on getting some free info) or buy a manual here: http://www.atv-411.com/honda-atv-repair-manual-9.html
undo pinch bolts, rotate cam clockwise (that's the big housing that the axle runs through) and tighten pinch bolts again. Its not a cam its called the carrier and you would turn towards the front of the ATV to tighting, still allow the chain to have some slack 3/4 inch
There isn't a "timing" on a 400ex or any other atv. There is a timing CHAIN, and timing chain tensioner. -my400ex89 "go big or go home"
The official Honda website would have Honda ATV parts for sale or would at least have a list of dealerships that are in your area that sell Honda ATV parts.
take the timing chain cover off and with a wire hanger pull it from the bottom to the top sprocket so it doesn't fall.