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check your spark plugs. If they are black, you need a lower main jet. If they are much cleaner, with only a small amount of grey, you need a larger main jet.

The owners manual for ALL metric bikes says oil must be JASM (?) rated.

If you buy aftermarket, use Amazon prime for free returns. Other than that, you're likely only going to find a used one

Yeah, getting that right isn't intuitive at first.

Might be cheaper to fix than replace. Get a quote!

Why do you need to replace yours?

Hey. I had the same issue with that light. I opted for not running driving lights. Bought a different brand for my honda 919 and everything works perfectly. Your issue is likely in the headlight circuitry, not your skills.

Look on ebay or marketplace?

Not exactly. This bike at idle will drain the battery faster than the charging system can replenish it. It isn't a modern car charging system. These old charging systems go bad for a variety of reasons (carbon build up, brushes wear down, wires become brittle, R/Rs fail) so don't be too...

Sounds like you need to empty the bowls. Might have gotten something in there and the agitation of the bike will eventually send it to the jets. When you shut the bike off, it settles to the bottom of the bowl again, allowing it to start and run... until it gets back to the jets.

It's a 750 but you don't have to open the throttle all way. Like he said, learn the bike. You can look for a list of things to check on the bike before you buy it (does it start easily cold, any rust in the tank, etc.).

To know the RPMs? I think there are apps out there that listen to the motor. Can't vouch for accuracy.

I'm not sure I understand your question. If the manual says use moly there, use moly there.

That specific grease is resistant to high heat and high pressure. It is mandatory to use that and avoid other grease or lubricants.

So true. That 500rpm is so ridiculous. But at 800 RPMs, is your oil pump running optimally?

I didn't use a delicate RPM gauge, just the stock one on the bike. But you do need something to set the idle correctly.

So, from the engine and on decel only? In need to think about that one.

To the experts, would the rear shock bushings being worn out make that noise?

It was the fuse box at the handlebars of a cb750k/c.

Luis, how are ya'? I bought a cb750 part from you last year and I got that red beauty in person. Still looking pristine! Sorry to hijack the thread, back to Luis's question....

Good to hear!

Poor carb sync can cause symptoms similar to vacuum leaks, poor fuel delivery, and electrical issues. Best to do that to narrow down troubleshooting.

Yikes. I have no experience with 90s nighthawks, but assuming your carbs are completely clean, you might have to sync them up.

Hopefully someone with a deeper knowledge than mine comes in. All I can suggest is starting with that fuse and start chasing it both directions until you find an obvious issue like frayed wires grounding, two heat leads touching, etc.

You will know soon enough.

Damn, nasty crease. You don't seem to have anything to lose trying to knock that out.

What circuit is it blowing?

Old crow, how bad is the dent? Brickhouse Builds did a video using an innertube to push a dent out and it worked pretty well.

Your 6k limit is exactly what mine did. The fact it revs slowly past 6k but not quickly tells me valves. But it could also be piston valves holding the carb needle having friction on the way up. Might try polishing the piston valves and caps.

Sounds like valves out of spec to me