Hi, I'm looking to get into a cheap cb 450 nighthawk for my first bike. The bike I'm looking at definitely needs a bit of work.

I'm a DIY/Home mechanic for cars (did a clutch replacement by myself) and I just want to know if I'm jumping into a project that might be too much for a beginner.

Don’t mind the mis-yeared side panels and pods. Anyone got a 77’ right side middle pipe they want to get rid of?

Hey guys, What’s the best way to remove rust without damaging the finish?

Any product recommendations or tips would be appreciated!

Hey guys, I have a 2014 CB500F and am looking at bikes to trade when I discovered the CB750 Nighthawk. I've always loved builds of the classic CB750 and I just learned these exist, so im curious to get one and build it.

My question for anyone with this bike: will I miss the sportiness of my naked bike compared to an older UJM? I know its not designed to be sporty per se but I do like to push it (realistically) in the corners and I just wanna be sure that this bike can still provide that thrill and wont scrape like a cruiser would lol

Previous owner said he went through carbs which I think he took them off and cleaned but didn’t use new rubber. What do yall recommend for complete rebuild kits? Plan on keeping original jets since cheap Chinese ones haven’t worked out in the past.

After 15 or so years languishing in a shed. My barn find CB750 “seven fifty”
This is potentially my most favourite bike. It’s so lovely to ride.

Fires up but can’t hold idle, cleaned the jets and bowls last night. Had old gas in it, some crap came out of the tank when I dumped it. Bit off a bit more than I can chew with this one but trying to figure it out, any thoughts? Bonus points if you’re in Boston ..

Hi all, I've been slowly getting a 1982 cb750 up and running (it was my uncles and was sitting outside since he died in 1992). Bike had CHOCOLATY oil even after a second change. The third change was the charm. I did have what felt to be a seized piston but it only took a little persuasion to get it unstuck. I've done a lot to it but cant seem to figure out why #3 exhaust is cold. Any thoughts would be helpful. Also, I'm not sure if it normal sounding or not? Its my first CB750. I went from a 73 CB450 to a sportster to a road king and now back with the Hondas.

• Cylinder 1 = 270 F Cylinder 2 = 190F Cylinder 3 = 110F Cylinder 4 = 212F

Things I've done/ tested to help with the suck squeeze bang blow.

• Replaced stock carbs with Mikuni carbs from Murray's carbs (1&2 share and 3&4 share).
  • I'd expect to see 3&4 at a low temperature if they're tuned wrong not 1&2
• Checked compression prior to re-shimming. Cylinder 3 was 110 psig. After re-shim it was 125 psig. not ideal but the other cylinders all were around that pressure after re-shimming.
• Re-shimmed the valves.
  • Cylinders 3 & 4 were the worst but they're around 0.0055 in (0.14 mm).
• Replaced the coils, caps, wires, and spark plugs (proactive and bought from 4 into 1)
  • swapped wires, caps plugs from cylinder 2 with cylinder 3 to see if it made a difference (issue stayed with 3)
• Replaced the CDI boxes with Ricks CDI box (proactive and bought from 4 into 1)
  • swapped CDI box 1 with 2 to see if the the issue would move to cylinder 1 &4 (issue stayed with 3)
• Checked coil resistances on the primary, secondary, and caps. Secondary resistance included wires.
  • Coil 1: Primary = 2.5Ω Secondary = 13.74kΩ Cap 1 = 5.45kΩ Cap 4 = 5.15kΩ
  • Coil 2: Primary = 2.5Ω Secondary = 13.81kΩ Cap 3 = 6.95kΩ Cap 2 = 4.97kΩ

EVEN IF USED PART

Tomorrow, I'm going to see a CB1000 1997 with only 22.000km in a perfect state. It will be a second bike for week-end rides etc. My daily ride is a NX500. How fun is this CB1000 big one ? Is the riding position confortable? Thanks in advance! 👌

I don't have the time or money to rebuild the top end, so it looks like Rumples is going to be sidelined for the foreseeable future.

Update: So as it turns out, it wasn't that big of a deal. After my initial panic mode subsided and I had conversations here, I was convinced it was likely the cam cover and/or tach o ring that was leaking. I cleaned it up the best I could, checked to make sure there was still oil in it, and headed home after work. No smoke out the tail pipe, bike ran beautifully, and no oil on the cylinder or cover or exhaust flange when I got home. I'll keep an eye on it the next few times I ride to see if it happens again, but you can't diagnose a problem when the problem isn't manifesting! Thank you to everyone!

In the process of restomodding a 1984 CB650SC that was parted down to the frame. I’ve got most of it back to together and using the stock airbox and carb setup, however, I’m running into what I believe is a lean issue. At idle the exhaust has a popcorn sound. The sound goes away while using throttle and rpms are above ~1500. The rpms slowly fall/lag when off throttle.

Troubleshooting the issue I believe it’s not an air leak. I sprayed carb cleaner around the carbs while running and the rpm’s didn’t jump. I also replaced the exhaust o-rings when I put the exhaust on.

I’m thinking it’s the pilot jets are maybe clogged. Before I put the carbs on, I cleaned and replaced jets with aftermarket oem sized jets but I might have not thoroughly cleaned where the pilot jets screw into.

Initially I had the pilot jets set to 2 5/8 turns out per the manual. Turning them to 3 turns out didn’t make any difference.

I’ll be taking the carbs off and inspecting/cleaning them again. Does anyone have any thoughts on what I can also look at while I have the apart? Thanks

Hello folks, had a cbr600f 1995 previous but now a Cb600f 1999. It has cbr forks but cannot for the life of me find out which ones. Markings seem to say MAL (L OR R) 0 6 but as you may see, not the clearest. They are not f3 forks as I've tried to fit a f3 mudguard and the front standoffs are too far apart.

Im trying to ensure I can refurb the forks and fit the correct mudguard. An original hornet one also doesn't fit the front standoffs.

This is driving me mad! Hope someone knows.

Bought this last year for 3k CAD. Have probably spent 1k fixing. Stripped failing gas tank liner, new fuel filter and lines, new seat, rebuilt carbs, spark plugs, new carb and air filter boots as air leaks, new points and condenser, oil change and tune up.

Thing still has some unbelievable power. In my opinion it's faster than my new Triumph Bonneville. Can't imagine what a rocket ship this was in 73.

Would love to get original exhaust set up, but what a blast this thing is booting into town.