I just found this site and it has been very helpful with the questions I recently needed answers to.
I have had this 81 Invader for about 10 years but have not put many miles on it as we dont get alot of snow here. I live in southern Ontario Canada.
This winter we have had alot of snow but, because the sled has sat for the last three years and not run or been moved, a few issues have come up...carb issues, which i think I have fixed but now the suspension is "locked down" but thanks to this site I have already got an answer that I am sure will fix it and then I can ride again.
I have attached a few pictures.