I can't find a manual or get information from the distribution network. Does anybody know how to tighten the chain on a Boreem ATV 250?

 

Can you post pic's of your rear axle?

Most quads adjust the chain by loosening 4 bolts and using the rear facing adjuster screws in the axle assembly to draw the rear axle backwards in slotted holes. Then you tighten the bolts.

I've also seen rear axles mounted in clamped eccentric disks where the axle is off center in the disks. If you loosen and rotate the clamped eccentric disks the distance between the engine drive sprocket and the rear axle changes.

Whatever the method, make sure that the chain doesn't get too tight throughout the possible range of suspension travel. Often the chain tightens as the suspension bottoms.

 

Thanks. I will see if there is a way to get the pics on today