Yesterday I was determined to get that seat out. After a lot of rocking and shaking , it finally came free . Turns out that the bolt that the seat locks onto was slightly bent.
After careful and precise application (a couple of hard whacks ) of a finely calibrated adjustment tool ( ball peen hammer) the offending part moved into alignment.
Problem sorted....
check the exhaust pipe right out of the head.. Prone to cracking and breaking off . ANOTHER factory defect from Massimo Poor Quality .. I implore you to bypass the fan switch and run it 100% when key is on .. MSUs have massive overheating issues that blow head gaskets and warp or crack heads.. And Massimo WILL NOT WARRANTY IT