Topic: Engine Swap

[Big C]

I am attempting to bring a '76 750A back to life. The bike has 4,000 miles on the clock and I was told that it had been in storage for 30 years. Not much wear on anything, original tires, original gas in the tank (nice!) and the engine was frozen. I figured that I could sort that out, but what a mess! The pistons in cylinders 1 and 4 are all the way down, and cylinder 1 is badly rusted with a 2" deep pile of rust flakes and crud in it. I am trying to decide whether to either attempt to repair it, part it out, or buy a different engine.

Will a standard 750 engine fit the frame? I would welcome your thoughts on this project. Thanks!

[raymond10078]

Can you - or have you tried to pull the cylinder?  You can replace the cylinder/pistons without removing the engine . . . .

I believe that a standard 750 can be fitted - maybe someone else will chime in . . . .

[Big C]

I haven't been able to get the cylinders loose yet. The cylinder assembly seems to be pretty well stuck. I have soaked the bores for several weeks with oil. Would you suggest that I bang on the pistons with a chunk of wood? I wouldn't be too concerned about damaging the pistons or cylinders, just don't want to damage the con rods.

[raymond10078]

Try this:

http://forums.sohc4.net/index.php?topic=84354.0

http://www.google.com/cse?cx=partner-pub-9323359806520211%3A1305160748&ie=UTF-8&q=stuck+cylinder&sa=Search&siteurl=forums.sohc4.net%2F&ref=&ss=2721j1294147j13#gsc.tab=0&gsc.q=stuck%20cylinder&gsc.page=1

[Sam Green Racing]

Take the advise of Prospect in that thread and remove the bottom end and disconnect the rods so that you don't do any damage to the bearings.
A five speed motor MIGHT fit but the earlier K model chain alignment might be out a bit, the later F model should be ok.

Sam.

[Big C]

I will take your advice regarding the bottom end. Thanks!

[MikeKato]

Big C

PM sent

GL!
Mike