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It took me a while to find this site, and this is my first post. Seems like a lot of knowledgeable folks here and a good place to tap into some knowledge if needed. So here goes....
A few days ago, I bought/traded for a 1980 CB750f. The bike did not run, and all the cable controlled functions were frozen and did not move, nor did the brakes. Trans felt ok. Tank had some light rust spots in it and smelled of old gas, though it was dry. It was a gamble, not knowing if it would even turn over(dry locked), but I thought it'd be fun so I brought it home.
What I've done so far.
First I pulled the seat and battery/box. Next I pulled the airbox back so I could remove the carb bank. The air box had a mouse nest in it and was full of straw, so I cleaned/washed that out after I pulled the rusted air cleaner/spring out. I cleaned the intake boots and blasted the plugs. I put some oil in the cylinders and with the plugs out rocked it back and forth in gear-Good,the engine is free. I will start on the carbs prolly this weekend and get those cleaned up. Plan is to see if the thing will run first, then go on from there. The odometer has 21k on the clock, so the engine should have plenty of life left in it if accurate. I'll replace the fuel line, and run gas from a clean tank to do the test fire(no pun intended, heh!). I should note that the oil is full and looks new. Total gamble I know, but I think I can make it run. I'm not going to spend a dime on it until I know it will run. In the mean-time
I'm also dripping oil into the cables as I go to free them up. I found a registration from 96 and 97-I'd guess those were the last years it ran. I'll keep you posted as to progress and upload some pics as I have time.
The last project I did like this(5 years ago) was a dry locked '81 Suzuki GS450 that had sat under a tree for 12 years. I got that bike for free so nothing to lose. I restored that bike down to the paint, then sold it after clocking an additional 16k miles on it, so it had 37k miles on it when I sold it, and it still ran and looked great. In other words, I've been down this road before, but it's fun when you can take a pile of worthless junk and put it on the road again....Will see how it goes!
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Welcome  Gleado,
Seems your a bit ahead of the game an engine is an eng..Just when it comes to were this and that is.
Nice bike and year  Keep us posted and how about some before pic's fo now. 
1977 CB750 F2 Super Sport
<LET THOSE WHO RIDE DECIDE><RIDE TO LIVE-LIVE FOR JESUS>
Native American from central Cal, Kickstand UP in S.W.Missouri,
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Administrator
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Welcome to the forum. Sounds like a good plan. I would bet dollars to doughnuts that that engine is good.
TOOLS
Life is not about the number of breaths, you take, but the moments that take your breath away.
I don't have an anger problem. I have an idiot problem. Hank Hill
Never confuse education for intelligence.
Happiness is a belt fed weapon.
I just can't imagine what could go wrong.
No fire? No explosions? So whats the point of your story?
Those who are too smart to engage in politics are punished by being governed by those who are dumber. ~Plato
It couldn't be done, but the darn fool didn't know it, and did it anyway.
We all got problems. Ksharp
I like vintage bikes because they take me away from the clutter of technology that I work with everyday and back to a simpler time of mechanical elegance and simplicity.. "ninadm"
Darkwing Duck: The worst part of public transportation is the Public.
"That is awesome shit there" Re-Run
"Fear nothing, attack everything" Eric Berry
" Oh, you read that on the internet? Clearly it IS a massive problem. Of course it CAN’t be normal operation."
1976 CB 750-A X 2
1977 CB 750-A X 4
1977 CB 750-K
1976 CB 750 F
1981 CB 750
1966 Kawasaki SG 250
1981 KZ 750 LTD
1973 CB 350
1979 CM 185 Twinstar
1982 Honda XL 80
South of Eden (Kansas City MO)
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I agree. It would not seem logical to me to keep a bike around that long if it wasn't any good, but we'll see. Thanks guys for the encouragement. I'm working out of town thru tomorrow so will be a few days for pics.
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Administrator
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Welcome gleado. I like how you think! Those gambles are the most gratigying when you pull it off. 
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In case your wondering, I have 215.00 invested in the bike so it's not going to break the bank. If you notice the seat pan has curled up slightly as the old seat cover contracted with age. When I got it home I released the tension off the pan by removing the seat cover at the edges. Hopefully the plastic pan will relax back to it's original shape. If not, I'll form it to fit and use sheet metal to hold the shape where it's supposed to be, but leave enough room to staple the new cover on. In the worst case, I'll buy another seat that is has better condition foam and pan. Next step is to do the carbs.
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Banned User
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CONTENTS DELETED
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there are some very smart fellas on this forum.
With my opinion and your knowledge, we can change the world.
KEEP YOUR FISTS UP, FOR BALANCE AND PROTECTION!!!
i like fat chicks
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Nice looking bike. I bet you're going to get that thing running like a champ.
Do a search on this forum for DOHC carb cleaning. There is a good thread with several different sets of step by step instructions (including pics) on how to clean the DOHC carbs.
1981 CB750K with 900 cams
90K KM's, rebuilt head, rebuilt carbs, upgraded valve stem seals
My wife's recipe website that I'm trying to help promote: Strawberries for supper. Yes, I am a lucky man.
My cb750 video site
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Hey if that project doesn't work ill buy the gas thank! Hehe ;) sorry... That's not very positive but your tank looks flawless! I have an 82F in the same color scheme and my tank is eff'd up, I want yours! Anyway Good luck bro! This was a while back so I hope by now its up and running!
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Locked
