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Just an update for posterity in case it might be helpful. My friend had his 750 on the road for a few weeks, still prone to being way lean and cylinder #1 is not firing well (temp on the pipe is signficantly less than the others). Plus he has a valve cover oil leak, so I have his bike back...

While the carbs were on the bench I looked into the pilot screws. 2 of them were at the OEM 2 3/4 adjustment, the other two were way lean because the pilot head pointers were set to the same position but getting the oddballs to the OEM adjustment meant they would need to unscrewed almost half...

Front wheel bearings replaced, they press in the usual way- rust coating the inside of the wheel from the water leaking in sheesh. So washed it out with alcohol, cleaned everything up and got the front end back together. I ran the engine a bit, the leak I thought was oil turned out to be gas...

Got the forks sorted; made a oil seal installation tool out of 1 1/2" PVC pipe on the lathe, used a pair of bar clamps to press in the seals. Only had to replace one slider, the others in good shape. I chickened out and filled the tubes upside-down, cut down a funnel for a tight fit over...

There oughta be a law... man the oil seals gave me a fun time on the forks, had to chew up one of them with a screwdriver before it would move and it took some hammering for sure. The solidified gunk in there smelled like dirty diapers when I wirewheeled it out but almost no damage at all to...

Finally got a break with this bike- got the forks off, not only is there oil in them (dirty but recognizable), but the bottom screws came out without drama.. unbelievable. Might be all they'll need is new seals and fork oil. The last technical issue I'm working on is an oil leak somewhere...

Ugh my salvage ebay forks were nasty nasty, could not budge them with air impact and oxy/acetl torch so drilled the heads and punched. At least they were cheap. That worked fine but when I flipped the 1st one back upright and the fork stroked & sprayed the grey watery oil all over my bench...

It is in fact a Nighthawk. With the weather mostly bad progress has been slow, but I did get a warm enough day to get the carbs in and hooked up, replaced the rusty plugs and put in some 0% ethanol gas and started up. It ran fairly well, all 4 cylinders firing and the pipes heated...

The af mix screws are all against the stops, butterfly closed positions are close- doesn't seem like anything is really crazy. No idea how the thing will idle- I guarantee my guy has done no tuning whatsoever on this bike and it clearly hasn't run properly for many years. Going to replace his...

Got the carbs back in today- throttle retract cable had parted via rust..sheesh, so got him a new set of cables too. New ones fit fine. I used a 37" carpenter's bar clamp to seat the carbs- worked well; the plastic pads on the clamp jaws are quite soft, one jaw on the carb, the other (w/...

Cleaned the carbs today- f'ing mess. 2 enrichener jets clogged, 2 main jets clogged, 2 slides stuck not all on same cylinders. Used .010" copper wire to clear the jets, blew everything out with carb cleaner and compressed air- all passages clear now, slides move properly and diaphragms move...

Front calipers now feel great with new rings, gonna work well. A warm day today, so dug the carbs out of the bike. DIdn't break anything and gained a lot of admiration to the engineers & designers, some very elegantly fit stuff in there, much easier to get them out than the carbs on my old...

Grease did the trick, doesn't need very much either. I tried a couple different 10mm zerk fittings on the brake line inlet, an odd thread pitch- maybe too fine so that didn't work. So I fit an 8mm zerk in the bleeder, and stacked a bunch of 10mm copper washers onto the brake line bolt to plug...

Ooo fun, never though of pumping in thru the bleeder port with a plug in the inlet, thanks! I don't mind using a tube of cheapo grease to get the pistons moving. I was kicking myself for tossing the old Bandit brake lines I was thinking of rigging something hydraulic but your idea is better...

Hi all, I'm a Suzi/Yamaha guy but am repairing my friend's '92 CB750. Its the usual sort of thing; he bought the bike in good shape, parks outside uncovered all the time, infrequent maintenance, rides it only the good weather etc. I rescued the bike when it wouldn't start and left him...