Beachumb
CB750 Member
Hello all, new here. A little background. Been working/ripping my '79 750 F Super Sport for a couple years now. Its been very testing. I bought it stock with a bent and leaking valves. I started by rebuilding the top end and rebuilding the carb bank. I sent the head out where they resurface the head, block and installed new valves in the head. I cleaned the pistons, had the cylinders honed and then I installed everything. This is where the head ache started. It wouldn't start, no compression.
Turns out the shop that installed the valves, forgot about cutting them to length. So I ripped it all apart. Again. Sent the Head back, they cut the valves, installed the head. Boom, fired right up. Rip her around for a few months. Then 4th of July 2016 about 3 a.m. someone comes in the driveway and cuts everything they can find in the dark. Markers/lights/leads/batt leads/carb boots/brake lines ...... I fix, everything. Bike is ripping again and my blood that had cooled from a boil, to a simmer; is now back to normal temps......end of the summer 2017 my cylinder block cracks, bike is bleeding bad. After inspection, I believe the cam chain, which I have been meaning to replace (and should have when I did the top end for some reason I only replace the intake cam chain, was buzzing the side of the block where its thin wall and cut through the side.....SO. I am starting over. Again. And I would like this to be the last time I remove engine from frame, and go deeper than the head cover.
So I'm looking for advice or a lead on a new cylinder block. Only option I see is rolling the dice on eBay. They seem inexpensive. But are they usable?
Also, while I'm in there, I think Ill do the engine studs with some heavy duties but I can't find those either. See them for the SOHC but not DOHC. Any advice much appreciated.
Turns out the shop that installed the valves, forgot about cutting them to length. So I ripped it all apart. Again. Sent the Head back, they cut the valves, installed the head. Boom, fired right up. Rip her around for a few months. Then 4th of July 2016 about 3 a.m. someone comes in the driveway and cuts everything they can find in the dark. Markers/lights/leads/batt leads/carb boots/brake lines ...... I fix, everything. Bike is ripping again and my blood that had cooled from a boil, to a simmer; is now back to normal temps......end of the summer 2017 my cylinder block cracks, bike is bleeding bad. After inspection, I believe the cam chain, which I have been meaning to replace (and should have when I did the top end for some reason I only replace the intake cam chain, was buzzing the side of the block where its thin wall and cut through the side.....SO. I am starting over. Again. And I would like this to be the last time I remove engine from frame, and go deeper than the head cover.
So I'm looking for advice or a lead on a new cylinder block. Only option I see is rolling the dice on eBay. They seem inexpensive. But are they usable?
Also, while I'm in there, I think Ill do the engine studs with some heavy duties but I can't find those either. See them for the SOHC but not DOHC. Any advice much appreciated.