Tightening block bolts. Full size 1000 × 563 pixels Tightening block bolts. Tightening block bolts. Previous imageTest fitting piston rings to find a usable set. Next imageWe decided to go with a V4 cylinder head bolt as it turned out to be similar length as two stroke. The black bolt in the picture is V4 and the lighter is two stroke original. Leave a Reply Cancel replyYour email address will not be published. Required fields are marked *CommentName* Email* Website Save my name, email, and site URL in my browser for next time I post a comment. Δ