A forum for owners of Yamaha TTR250 trail and enduro bikes!

To save you the bother of using Google I've obtained these suggestions from EHow?:-

1.      Invest in a seat cover. There are several aftermarket pads and covers made of textured material that are designed to minimize butt slippage.

2.      Invest in a new seat. Not only are aftermarket seats designed better, but they utilize materials that prevent slipping.

3.      Do it yourself. Spray Super Grip on the seat, experiment with double-sided tape, or strap a rubberized fabric to the top of the seat. Those are just a few homemade options.

4.      Ride in leather pants. Leather is more prone to sticking to the seat compared to jeans or light fabrics.

5.      Modify your seat. Take it to a specialist and have the foam reshaped so that you are seated deeper in the bike. If you are good with a turkey carver, remove the seat's cover and reshape the foam. Install a new anti-slip cover to further enhance the anti-slippage effect.

Although there are more options they give sound advice.

Quite a few riders on the forums have plumped for option 5 with acceptable results for a modest outlay.

Martyn