CB750F: Day 25: Rolling Along

At class, it is really sitting in good company. Usually I buy dinner and eat there, by myself, though it is not lonely.
The new chain and sprockets came in so I started by removing the rear wheel. It was so simple, but I couldn’t imagine it until I had seen it: loosen the right and left alignment, there are notches that show the “setting” on each side, that is important to restore. The rear axle has a bolt with a cotter pin that I removed. Then I removed the brake link, and the caliper itself, then turned up the alignment adjusters and pushed the wheel forward and removed the chain and pulled the wheel out. The large zip ties were really helpful to hang out the brake link and caliper.
Before starting I didn’t know to find the master link in the chain and remove it first, I will do that next time instead.
The front sprocket encasement is full of centimeters of filth, that will take a while to clean it out. A non-abrasive plastic “drill bit” would nice to pull that stuff out, of course it would have to be disposable.
Tonight I did use an impact wrench for the first time, brilliant. The small one got the front sprocket bolt out and the big one got the rear sprocket bolts off, the latter were on there super-tight and the impact wrench just took them right off.
Speaking of cleaning, the front sprocket had an empty cocoon on it, and I cleaned up the rear wheel as best I could without compromising the lubrication with cleaner. Before wrenching on the bolts I tried to clean them up first to keep the tools clean.
Pat said that the rear wheel plastic pads internal to the wheel look fine, so I won’t replace them.
Today did go pretty well especially after I found out that class will continue next semester, so it is not a race to finish the bike. That said, it would be fine to make some progress, also. The headlight awaits, brake pads maybe, continued cleanup, and maybe upgraded suspension.
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CB750F: Day 24: That Changes Everything

Tonight I really wanted to see if I could make progress like the article did on polishing your aluminum engine case so I bought some Dremel attachments. The results were generally nice, but didn’t get it all the way there. Since I had borrowed the Dremel, I removed some of the crudified paint from the right horn and grip assembly for future painting. At the end of the night I felt good, that it looked pretty decent, even though it is not a perfect mirror finish.
At the end of class Pat told us that this might be the last semester, ever. As such, I’m going to shelf the polishing, and spend spring break acquiring the necessary gear to complete the most important service tasks, eg: brake fluid change, new sprockets and chain, front fork fluid, and more.
At the end of my work, I sprayed down the engine with a very diluted Simple Green mixture to get the carb spray off and ended with using compressed air to get all of that included; I didn’t want anything that the plastic wouldn’t like on there.
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CB750F: Day 23: Engine Polishing Continues

On the way to the shop I stopped at Harbor Freight and bought a 7-pack of 500 grit wet/dry sandpaper, and boy it finishes fast. The “you are going to need patience” advice kicked in tonight. It was so strange, after hand-sanding and also trying out the tiny little brash brush with the Dremel, I thought that it was getting close to the metal but Pat showed me how there was still clear-coat on there. What?!
You can’t see it, and it is very shiny, but you can feel it. It feels like the fine grain of a leather jacket, and it has kind of a different finish than the edges where you can feel that all of the clear-coat is gone. Numerous breaks were necessary, and the dish-washing gloves helped. The Dremel was pretty helpful for digging crud out of some of the tight spots, and I’ll need to buy some new tips.
Pat brought in his recommended choke and throttle lube, Remington Wonder Lube.
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CB750F: Day 22: Engine Polishing Begins

Tonight I came prepared with 600 grit wet/dry sandpaper and quickly realized two things: sandpaper doesn’t last very long and I had more work to do with the wheel brushes. It was very iterative work, the more work I did and thought that I was finished the more I noticed that more needed to be addressed. It helped to take breaks and jump around to different areas to work on, because, well you do need to be quite patient.
Without pulling the engine I still could reach plenty. I decided to do just the sides and top and tonight I think that I got close to everything I want finished with the brass brushes leaving the sandpaper for next time.
Took some pics at the end, the engine, though rough and needing to be sanded down, does look a little more refreshed than before.
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CB750F: Day 21: Engine Polishing Begins?

Intrigued by the Vintage Japanese Motorcycle Club article about using a fine brass wheel brush, very slowly, on the aluminum engine case to produce a fine and smooth finish I tracked down the brushes at Lowes and picked them up, they are the same ones used in the article, great. Before starting I wanted to remove the old cylinder carb connectors and clean the engine up. The connectors were rock solid hard; through a combination of tin-snips, razor blades, and picks, and patience, I got them off.
To clean the case, I emptied four cans of carb cleaner along with brushing it intermediately. Before starting I had lined up paper towel on the life to capture the dirt, and in the end it was totally filthy and dirty. For some reason, I failed to take a picture. Some of the carb cleaner got in the engine exhaust ports; and Pat said that it was OK.
Before starting with the brass wheel I took a “before” picture, and then removed the shift lever and cleaned it, and the brushed the side cover. It is cleaned up, but not soft and supple like the article. Bummer, well now I’m committed. Took a last picture of the other side for reference.
Continue reading “CB750F: Day 21: Engine Polishing Begins?”

CB750F: Day 20

  • Realized that I ought to post as of the date of when the work occurred and will do so moving forward.
  • Got the front sprocket count, 15 16. The crank case was filthy, 4mm think of chain oil and gunk. Cleaned it up.
  • Tried to take a photo to show the shifter lever height.
  • Cleaned up the engine hangers.
  • Couldn’t find fine brass wheel brushes anywhere; will research online.
  • Verified that fuel line fits carbs.
  • Tidied up; the number of parts and supplies has again multiplied.
  • Confirmed that WordPress reverses the image order regardless of how I select the files. This is undesirable since the images are out of order in relation to the post itself; need to find a fix.

CB750F: Day 19

Tonight was a very “in the flow” kind of night.

  • Inspected the 30A fuse. It is present, along with a backup.
  • The carb insulators that connect the cylinder head to the cars need to be replaced, they are rock hard, I think I will have to cut them off. Figured I may as well clean the metal bands.
  • The air cleaner connectors were filthy too, so I cleaned those. Apparently you don’t really need a sealer between them and the airbox, but some people use it.
  • The airbox needed a little more cleaning, just old filth.
  • The chain and both sprockets need replacing. The chain is out of measure by the guide, has kinks in it, and hangs way too low. The rear sprocket has the chain links (88) sitting in it on the top of the peak (38)!
  • Cleaned the air filter and let it air dry in the furnace (aka classroom).
  • Nitrile glove evaluation: The generics from Wal-Mart break very quickly. The MidKnight are a little better, but also break quickly. The DermaLite are excellent; you can dig chain grease off the chain guard with your fingernails and the finger won’t break until maybe 15 minutes later which is way beyond the normal use case.
  • An oil change awaits!

CB750F: Day18

Ran out of time last week so here is a picture of the reassembled rack of carburetors. For the heck of it, re-checked the previously 1-finger-tightened float bowl screws, and they were not as tight as I had left them. Re-tightened them. Decided that I had better replace the air filter so as not to gross-up these immaculate carbs. Found out that it is reusable, great. Why are there insect remains in the air cleaner box? They and the grime and crap need to be removed, so out came the brake cleaner, even cleaned up the shifter lever. Decided to re-check the carb holder (shrouds that hold the carbs on the engine manifold) and they were somehow even harder than last year. They are rock hard and must be replaced.