penton motorcycle

my brother and his son rode this in the 70. . and had stored it there crawl space. he gave it to me and i had a mechanic fix what ever it needed. about 10-12 years ago. i rode it at barbers about 8 years ago. got it out last week to clean and get ready to sell. dumped very old fuel. fueled up kicked twice fired rite up . rode in yard runs and rides well. as far as year or engine size you probably know more than i do sorry. one guy told me it is a 78 250 mc5??? hate to sell. just have way to many toys. On Apr-24-15 at 06:59:26 PDT. seller added the following information: my mistake . i have been told this is a 76. to 78 175/ MC5. you check it out and make sure what your bidding on. thanks steve