Just wanted to post a pic of my homegrown drive sprocket holder. I got the idea from an old thread on this forum, while researching ways to remove the front sprocket. The manual says to break the nut loose while holding the rear brake pedal, but My bike is currently an engine and frame on a bench right now, so that wasn't going to work.
Attachment 20150216_134421.jpg not found
It's, a piece of the old chain, bolted to a 4ft piece of 2x2 board. Chain end gets attached to the sprocket, and the other end got zip tied to the tail of the frame. Then I had both hands to use a 3 ft cheater bar on the nut.
In hind sight, if I wanted a multi-use tool, I should have used pipe for the handle. The sprocket teeth and the bolts in the wood did a number on the end pictured. It still got the job done though.
or another alternative for holding the drive sprocket
80 KZ750 H1 - the Kaw calf
79 KZ750 Twin - Miss Nov 2008 KZR calander
79 KZ750 Twin parts bike
78 KZ650 C2 Parts Bike
75 KZ400 Wife's old bike sold
81 KZ440 A2 LTD Wife's new bike
84 Honda 450 Rebel Wife's newest bike