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1977 CB750 F2 Super Sport Rebuild
chrisbmxr:
Hi all.
So, as per my intro post, 4 years ago I inherited a 1977 CB750 F2 Super Sport from my late father in law.
He had owned the bike since 1995, but it was garaged in 1999 when he developed health issues. That is where it stood until I moved it to my garage last year. The bike has covered just under 22,000 miles and it looks like most of the parts on the bike are original. There are however signs that the bike has been dropped at some point. There is a small dent in the front of the tank and the left side cover is black, not Candy Presto Red like the rest of the bike. I guess this all part of the bike's history, but I may opt to completely return the bike to original eventually.
I've attached a couple of pictures of the 'starting point'. I'll try and post updates here as progress is made!
My plan is to first get the engine running. This will have its own challenges with bike having been stood for over 20 years! Then I will get the running gear sorted, and finally bring the bodywork and everything else up to standard.
Although I am not new to bike, I am new to SOHC's. So the help here will be greatly appreciated!
chrisbmxr:
Update 30.4.20
So, the past week has finally enabled me to make some progress on the F2.
I have removed the carbs from the bike. I really wish I had the knowledge to strip them down, clean them and put them back together myself … unfortunately I just don't! The throttle wouldn't actually open so I fear something has seized anyhow, so it's probably best that I let an expert work on them. That may hold me up though unless I can post them due to COVID-19. Any recommendations for someone to do this for me would be gratefully received!
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I've also been having a quick look inside the tank and the barrels using an endoscope camera. The good news is that the barrels look OK, but the inside of the tank has quite a lot of rust! I'll need to treat/remove this and flush the tank out before trying to start the bike.
I've also been doing some online retail therapy. New oil, oil filter, air filter, fuel lines, fuel filter and battery are on the way.
Spitfire:
After I'd left my 750F1 in the garage for 10 years while I worked overseas I too could not operate the throttle, turned out the float bowls were full of nasty looking gum which had glued everything together.
Cheers
Dennis
SumpMagnet:
Looks lilke a nice project :)
I reckon that will polish up nicely when it's done, and most importantly...looks complete and unmessed with. Apart from seeing a bit of life ;)
Carbs are quite complex, but the floatbowls and related assemblies are fairly simple. My advice is... take LOTS of photos when taking bits apart, as it makes it so much easier to see how stuff goes back. I made that mistake with the throttle linkages, and had a devil of a time working out how the two halves of the throttle spindles linked together. It was the one bit I missed.
Also...with floatbowls...if you take one apart at a time, you have 3 others for reference.
Also grab all the manuals and other scanned reference materials here. It's absolutely vital!
My floatbowls were also horrid....and the petrol in their had basically solidified in places, and left all sorts of nasty sticky mess. A good soak in a bucket of petrol followed by a bath in an ultrasonic cleaner did the job. Carb rebuild kits for jets, seals etc. are readily available too. I need to get 4 of them myself!
chrisbmxr:
That does it then! Looks like I'll be giving it a go myself! Stay tuned for an update.
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