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82-CB750F Problems Galore

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calaismarie

82-CB750F Problems Galore

Had my bike sitting for months waiting for a new clutch cable, and when I finally got around to that, I did a few other things as well. Pulled carbs off & cleaned them, re-sealed rusty fuel tank, put in new spark plugs & wrapped the exhaust... And now I've got more problems than I can count.

1. POWER/FUEL SUPPLY?: I can start it up with the choke fully out, but that's the only sure-fire way to keep it on. Sometimes I can keep it going with the throttle, but even then, it bounces around all over the place. On and off, the engine sounds like it's "clacking" on one side, but then it'll go away for a bit. I did add a carb cleaner and a fuel stabilizer to the fuel, but that shouldn't be causing this kind of problem, should it?

2. ONE CYLINDER RUNNING HOT, ONE COOL: On top of that, my second cylinder is running hot enough that in the 10-15 minutes I've had it running, it's already started burning & discoloring the new exhaust wraps. While Cylinder #1's pipe is much cooler than #3 & #4.

motogrady

Re: 82-CB750F Problems Galore

Administrator

sounds like you have the carbs messed up.
inline fuel filter, clean the carbs again.

TOOLS1

Re: 82-CB750F Problems Galore

Administrator

In reply to this post by calaismarie

You have a severe vacuum leak. Also your pilot jets might still be a little plugged.
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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)

calaismarie

Re: 82-CB750F Problems Galore

This post was updated on .

From your list, it seems like you might know a thing or two about my bike. Any chance you can send me a photo of the way the crankcase breather system is all hooked up? I've got the manual, but the diagram isn't super clear. I'm pretty sure mine's not quite right.

There are two ports coming off the back of the airbox: one pointing at the battery (seen in the image with no tubes attached) and the one coming off the bottom of the airbox (shown in image with the transparent tubing). Which attaches to the storage tank under the battery? And where does the other one connect to?