Hello there,
I am trying to feed 100lb cover (Mohawk Via Vellum to be exact) through my Riso RZ 990u but it's jamming almost every time at the very beginning of the feed process. I've tried all combination of feed dial settings but it varies only between not picking it up at all to jamming about an 1/4 of the way in. One time out of ten it makes it all the way through.

Is this a sign of a problem with the stripper pad or feed roller, or am I just being overambitious with the paper weight? I've had jobs printed on riso elsewhere on this exact stock and often see it listed with riso print shops so it seems like it should be possible...

Thanks for your input!

Eli