black bonnie is on to something. It is easy to ride way too tensed up. We tend to lean into the bars and grip them way too hard. And we also tend to either lock our elbows or to hold them locked in a "chicken wing" position with out shoulders all scrunched up (medical term). It is worse without a windscreen.
Try to achieve an arm position where you are just laying your hands on the controls gently and let the elbows fall straight down. There should be a significant bend of the elbow. In my case it is about 70 degrees, but everybody is built differently. If you can't do this with the bars you have then get some risers or some bars that will let you do it.
In the best of circumstances, and I am also your height, after a few hours I get pain in the lower part of my neck and at the top vertebrae of my back. Long before that it was time to get off and stretch out on the ground, or better yet, on your back on a picnic table.
Someone said that the more you ride the better it gets. I believe that because you simply CAN'T ride a lot all tensed up and you have to learn to relax more - or you simply aren't going to be able to ride much.
One more thing. A Throttle Rocker will help you relax your hand and the forearm muscle. And that helps because......."de leg bone 'connected to de hip bone, the hip bone 'connected to de............." Well, ditto with the hands, arms, neck and back..........
Monte

:-D
[ This message was edited by: mecscc on 2006-07-05 15:06 ]