1976 Honda CB750 - Project
1976 Honda CB750 - Project
picked up a project bike a few months ago and have been steadily rebuilding/replacing parts. figured i would post here for Azine's enjoyment since another project bike on the honda sohc bike forum is boring.
purchased in dallas off a hipster moving up north on last minute notice. said he wasn't planning on riding the bike up north once he moved. she sat in an apartment parking lot for the past 3 years, sad but true. he "cafe'd" it out by cutting off all the electrical items only to cause shorts and melt parts of the harness, nice one. nothing like having melting wires with your fuel petcock 2" away!
got home and decided to start eliminating future issues. step one...rewire the kids hack job of the original wiring harness. no pictures but just imagine your typical 35 year old wiring harness and melted electrical tape. she now has a new harness with start button under the seat, headlight, taillight, key switch and alternator charging system. all other crap, i mean safety features, were deleted.
repainted headlight bezel, mounted tach only, key switch.
carpy's exhaust 4-1 to replace for factory rusted out cut pipes.
clubman bars, ss brake line, master cylinder rebuild kit.
carbs. oh how you appear so simple when all together.
and then an explosion of parts!
we will skip the pictures, details and cuss words that go along with rebuilding the carbs (cleaned, new jets, gaskets and floats adjusted). final product....BOOM
new rubber came in the mail so off came the tires. do not underestimate the power of a milk-crate! holds the ass end of a 500# bike up just fine.
decided to start polishing the stator and clutch covers. have never done polishing before but turned out nicely. basically just sand until your fingers bleed and then hit with the buffer for the final stages...presto.
current state of chaos. i am awaiting wheel bearings and new coils this week. install those and bench sync/mount carbs. then should be able to fire and tune the carbs which i am predicting to go like crap. 0 history of tuning carbs. more later this week!!
purchased in dallas off a hipster moving up north on last minute notice. said he wasn't planning on riding the bike up north once he moved. she sat in an apartment parking lot for the past 3 years, sad but true. he "cafe'd" it out by cutting off all the electrical items only to cause shorts and melt parts of the harness, nice one. nothing like having melting wires with your fuel petcock 2" away!
got home and decided to start eliminating future issues. step one...rewire the kids hack job of the original wiring harness. no pictures but just imagine your typical 35 year old wiring harness and melted electrical tape. she now has a new harness with start button under the seat, headlight, taillight, key switch and alternator charging system. all other crap, i mean safety features, were deleted.
repainted headlight bezel, mounted tach only, key switch.
carpy's exhaust 4-1 to replace for factory rusted out cut pipes.
clubman bars, ss brake line, master cylinder rebuild kit.
carbs. oh how you appear so simple when all together.
and then an explosion of parts!
we will skip the pictures, details and cuss words that go along with rebuilding the carbs (cleaned, new jets, gaskets and floats adjusted). final product....BOOM
new rubber came in the mail so off came the tires. do not underestimate the power of a milk-crate! holds the ass end of a 500# bike up just fine.
decided to start polishing the stator and clutch covers. have never done polishing before but turned out nicely. basically just sand until your fingers bleed and then hit with the buffer for the final stages...presto.
current state of chaos. i am awaiting wheel bearings and new coils this week. install those and bench sync/mount carbs. then should be able to fire and tune the carbs which i am predicting to go like crap. 0 history of tuning carbs. more later this week!!
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check out the high bidder on my old cover...
Last edited by distortedolskool; Jan 4, 2011 at 10:14 PM.
bearings complete. carbs sync'd. new coils, wires and caps. tomorrow adjust the rear and bleed the front brakes.
bike runs much better with the 120 main jets. i have no front brake pressure yet and some very very soft rear brakes since they haven't been readjusted. do some 20 mph cruising and everything seemed well. can't wait to see if the 40mph flat spot is gone.
ngk caps with new honda coils under the tank.
bearings were placed in the freezer and knocked right in. purchased these pushers at harbor freight. worked very nicely and will come in handy again for the head bearings.
carb tune brass tubes installed on the carbs ready for balancing
carb sync device. carbs draw individual vacuum for adjustment.
bike runs much better with the 120 main jets. i have no front brake pressure yet and some very very soft rear brakes since they haven't been readjusted. do some 20 mph cruising and everything seemed well. can't wait to see if the 40mph flat spot is gone.
ngk caps with new honda coils under the tank.
bearings were placed in the freezer and knocked right in. purchased these pushers at harbor freight. worked very nicely and will come in handy again for the head bearings.
carb tune brass tubes installed on the carbs ready for balancing
carb sync device. carbs draw individual vacuum for adjustment.
Disinformation Terminator
Joined: Jun 2005
Posts: 1,930
Likes: 0
From: NorCal
For those who aren't familiar with it, the Honda CB750 was essentially the Hayabusa of its time; it was the first mainstream bike to introduce an inline 4-cylinder and an overhead cam configuration back in 1969. Its significance in motorcycle history cannot be overstated.
It is largely considered to be the source of the term, "superbike".
It is largely considered to be the source of the term, "superbike".
Last edited by TheMirror; Jan 8, 2011 at 09:05 PM.
Needs more Lemon Pledge
Joined: Mar 2005
Posts: 52,768
Likes: 2,000
From: Phoenix, AZ
For those who aren't familiar with it, the Honda CB750 was essentially the Hayabusa of its time; it was the first mainstream bike to introduce an inline 4-cylinder and an overhead cam configuration back in 1969. Its significance in motorcycle history cannot be overstated.
It is largely considered to be the source of the term, "superbike".
It is largely considered to be the source of the term, "superbike".
got everything back running but i am either not firing or partially firing on cyl #1. the header pipe remains colder than the others, you can actually leave your hand on it. if you pull the #1 wire no change in engine idle.
checked compression. i have spark. switched 1 and 4 wires with no change, one is still dead. i am going to change the plugs, set the timing and valves tomorrow to see if that helps.
checked compression. i have spark. switched 1 and 4 wires with no change, one is still dead. i am going to change the plugs, set the timing and valves tomorrow to see if that helps.
got everything back running but i am either not firing or partially firing on cyl #1. the header pipe remains colder than the others, you can actually leave your hand on it. if you pull the #1 wire no change in engine idle.
checked compression. i have spark. switched 1 and 4 wires with no change, one is still dead. i am going to change the plugs, set the timing and valves tomorrow to see if that helps.
checked compression. i have spark. switched 1 and 4 wires with no change, one is still dead. i am going to change the plugs, set the timing and valves tomorrow to see if that helps.
Needs more Lemon Pledge
Joined: Mar 2005
Posts: 52,768
Likes: 2,000
From: Phoenix, AZ
You probably know all this already, but have you looked at some of this stuff:
http://www.sohc4.net/index.php/archives/65
??
http://www.sohc4.net/index.php/archives/65
??
Last edited by stogie1020; Jan 18, 2011 at 01:44 AM.
can't stop the projects!
made a plaster mold of the tank and then laid up fiberglass. plan is for a smaller tank replica tail instead of the pin tail.
also have items to rebuild and upgrade the front forks this weekend!
made a plaster mold of the tank and then laid up fiberglass. plan is for a smaller tank replica tail instead of the pin tail.
also have items to rebuild and upgrade the front forks this weekend!
I wanna get a CB. I just know if I get one it will be yet another never ending project in the garage 
How difficult is it working with fiberglass? I made an undertail for my Daytona out of thin gauge aluminum but I want to remake it out of fiberglass (or maybe CF if Im ballsy enough).
How difficult is it working with fiberglass? I made an undertail for my Daytona out of thin gauge aluminum but I want to remake it out of fiberglass (or maybe CF if Im ballsy enough).
fiberglass is easy to work with. just watch your hardener and resin mix as you don't want it to hot, cures to fast on you.
little more tail progress and oil tank in fabrication by someone with more welding talent.
new head bearings installed, forks rebuilt with progressive springs, master cylinder rebuilt (again), clipons installed, new cables and polished top.
new head bearings installed, forks rebuilt with progressive springs, master cylinder rebuilt (again), clipons installed, new cables and polished top.
progress has been slow but steady. next up is welding the rear hoop, relocating the electronics and mounting the new oil tank.
finally finished the tail.
rear plate. yea tags are a little old.
custom oil tank.
finally finished the tail.
rear plate. yea tags are a little old.
custom oil tank.
Last edited by distortedolskool; Jun 27, 2011 at 09:56 PM.
