4 cylinder/ SOHC CB 750 E help?

[cholera]

I have a 750 E motor I'm trying to rebuild, don't have the manual is there a pdf, maybe I'll do a search in a bit.

It's old & been down for awhile, it looks good as far as I've gotten but the pistons are stuck & won't budge I'm figuring it's from sludge. I've gotten the covers & gears off the block & the clutch out. I was able to get the rocker arms out of the guides but I can't rotate the crank to reach the bolts on the cam sprocket so I guess I'm gonna cut the chain & replace it later.
I've removed the nuts I can reach but some of them are tucked under the rocker arm guides real close to the valves & I can't get a wrench around them, I'm supposing I need to pull the head and take those from underneath but I can't get the head to free up from the cylinder block--
The Saki 4 I redid was straight forward. Is there a trick I'm not seeing?

• 
  
  

[Motorcycle Forum]

[cholera]

cb750 sohc top end rebuild on a budjet - YouTube


I found this & followed it backwards. So I figured it out--that cam tower looked like it was molded but I found it wsn't--

[DrBob]

Pistons stick to cylinder walls from rust, not sludge. Make sure you hone the bores well after using a ridge reamer. Inspect the motor very thoroughly, as motors that have been sitting get rust all over the insides from the condensation in the air. This assumes that the motor is good, and the problem is indeed stuck pistons and not a tossed rod or something else fatal.

[omegajim]

good luck.