Well I've now driven 1500k on my 250STXE and the rubber swing arm bushes have finally given up. I will never understand why Shineray made these bushes out of rubber

. They finally understood that you can't make the A-arm bushes out of rubber either, I think my STXE was one of the first models (June 2009) to have the A-arm bushes made from delrin and not rubber. Why on earth have they not done the same for the swing arm. They have got to be cheaper than the rubber bushes.
I have now made a new set of delrin bushes myself, complete with a new stainless steel tube to go through the frame, there will be a new stainless steel M12 bolt and safety nut as well.
If you notice that it is difficult to hold your 250 in a straight line on the road, then please have a look at your swing arm bushes. Just lift the rear axle of the ground and check weather your swing arm has any sideways movement. It should be nice and firm with only up and down movement.
This can also be a problem on the 250STIXE as well.
If anybody is interested in the dimensions for the bushes and the steel tube and has access to a lath, then let me know.
Cheers
Johnny