slipping frame
I had the same problem with my bike and I went with the sick bike part adapter.
The main problem I had was the seat tube was to wide. so I set up the big tube adapter. I did eventually loosen up, but I only put two nuts on it to see how long it would last before coming apart. I went for about four months before it started to vibrate at certain RPMs. I remembered what I did and promptly double bolted the engine and its been smooth ever since.
Something else I did was to upgrade the hardware with a grade 8 set from SBP This included all of the parts that touch the engine. I then took all of the mounting hardware (10mm nuts) and double bolted them, working one against the other, I also went down to the hardware store and got both the red and blue lock-tight and went after anything that had threads.
I got a kings adapter for my Shimano Disk brake hub and guess what? That rattled loose too. Its now held together with helacoils and red lock tight.
There is something about these little 2-strokes that just loves to vibrate anything that has threads loose, Including fender mounts and stuff you would not even think would be a problem. My advice is double bolt, Lock-tight, lock washer and recheck things before you take off. Its better safe than In ICU.
mike