Surprising....wonder why they offer the open chain then?Up date, just tried it on a motor with the cams out......
Used bent welding rod to try and push the chain down below the sprocket, didn't work
Don't want your beer or money
You must have been writing this at the same time I was writing my reply. What you are saying makes sense and seems very doable. This may be my "winter" project.OK....Let's think this thing out.
The idler gear simply reverses direction of the crank rotation relevant to the cams.
You can remove the cams, break the chain, tie the new chain to the old one, rotate the crank to pull the new chain through, rivet the new chain together, rotate the crank to TDC #1, install and time the cams. Job done.
The idler gear is irrelevant. Once the cams are timed on #1 TDC as normal everything is back to....wait for it....NORMAL....except you have a new chain.
Sometimes my brain gets so tied up that the obvious eludes me.
Going to sleep now. I'm old and need my rest.
See your 1 broken cylinder stud and raise you one.......