Chain spacer?

I will be changing my chain and sprocket out on my WR250R for gearing purposes. I'll be going to an O-ring chain. Will I have to put a spacer behind the front sprocket when going to an O-Ring, or is there enough clearance?

The bike comes from the factory with an O-ring chain. (I think you'd be nuts to run a non-O-ring chain on a dual-sport due to inherent fast wear and short life.)

With or without O-rings the sprockets should remain in the same relative position to each other. An O-ring chain may be a bit wider, but the additional width is the same on either side of sprocket centerline. Also, why would you put a spacer behind just one sprocket and not the other? If you did that they wouldn't be aligned anymore.

Hey Thanks, I'll double check my chain, sure looks on-O-ring