Author Topic: 1983 Nighthawk 550 resto  (Read 7268 times)

0 Members and 2 Guests are viewing this topic.

Offline Dnor72

  • Full Member
  • *
  • Posts: 83
1983 Nighthawk 550 resto
« on: April 10, 2017, 08:29:01 AM »
After finishing the CB350F I needed another project. I picked up this 1983 Honda Nighthawk 550 for $450. She is rough, but she does run, albeit very poorly. 47,000 miles, compression is low-ish 90-110-100-100, shoots up to 180 with a little oil added to the plug hole. Chrome is surprisingly decent, seat is okay, wheels are acceptable, brakes work, all electronics work. Gonna get her running right and then strip her down and bring her back.

Is the "Project Shop" the right place for this or should it be in the "Other Bikes" section?











Oh yah, those look nice.


And she runs
« Last Edit: May 19, 2017, 03:59:33 PM by Dnor72 »

Offline Dnor72

  • Full Member
  • *
  • Posts: 83
1983 Nighthawk 550 resto
« Reply #1 on: April 12, 2017, 08:58:31 AM »
Oil and filter change. What a PITA getting the oil bolt through the oil cooler and screwing it in. So simple, yet I kept thinking it was going in crooked and messing up the threads. Eventually got it in, shouldn't have been that difficult.

UPDATE: The oil filter I bought (Wix) was about 1/8" too tall and so the filter holder would not screw down all the way, hence the difficulty screwing it on. Got a different brand filter and it went right on no problem.

Also took the carbs off. Going to strip them down and clean them up while waiting on some rebuild kits. Aside from the throttle cable being attached way down inside the carb rack, these seem a little simpler overall than the ones on the CB350F. Rubber boots look good.






« Last Edit: May 19, 2017, 04:01:22 PM by Dnor72 »

Offline Dnor72

  • Full Member
  • *
  • Posts: 83
1983 Nighthawk 550 resto
« Reply #2 on: April 28, 2017, 07:17:20 AM »
Replaced the plugs, air filter and rebuilt the MC for the clutch (she shifts now).

Nice mouse nest in there


Cleaned the carbs and replaced all the rubber bits. These carbs had definitely never been separated before. Stripped most of the screws that keep them together and had to extract them. Replaced with OEM. Bench sync is pretty easy with these carbs.




Installed


Vac sync




Sent from my iPhone using Tapatalk
« Last Edit: April 28, 2017, 07:27:01 AM by Dnor72 »

Offline Dnor72

  • Full Member
  • *
  • Posts: 83
1983 Nighthawk 550 resto
« Reply #3 on: April 28, 2017, 07:19:28 AM »
Running not terrible. Cam chain/tensioner def needs some attention.

« Last Edit: April 28, 2017, 07:57:29 AM by Dnor72 »

Offline Dnor72

  • Full Member
  • *
  • Posts: 83
1983 Nighthawk 550 resto
« Reply #4 on: May 07, 2017, 07:19:07 PM »
Digging into the top end, to replace the cam chain tensioner, take a look at the valvetrain and re-ring the pistons.







« Last Edit: May 11, 2017, 07:16:17 AM by Dnor72 »

Offline Dnor72

  • Full Member
  • *
  • Posts: 83
1983 Nighthawk 550 resto
« Reply #5 on: May 11, 2017, 06:24:52 AM »
A couple of the exhaust valve seats could use a regrind, but that will have to wait until winter when I plan on dropping this off at the machine shop for a proper service. Cleaned everything up, checked tolerances, new valves stem seals, lapped the valves and she's going back together.








Sent from my iPhone using Tapatalk
« Last Edit: May 12, 2017, 11:53:18 AM by Dnor72 »

Offline Dnor72

  • Full Member
  • *
  • Posts: 83
1983 Nighthawk 550 resto
« Reply #6 on: May 12, 2017, 11:56:44 AM »
Valves back in place, head degreased, scuffed and painted. Valve cover polished.





Getting ready to ring the pistons and prep the cylinders.






Sent from my iPhone using Tapatalk
« Last Edit: May 12, 2017, 12:02:10 PM by Dnor72 »

Offline Dnor72

  • Full Member
  • *
  • Posts: 83
Re: 1983 Nighthawk 550 resto
« Reply #7 on: May 13, 2017, 03:55:16 PM »
Ring end gaps checked, bores in spec, honed. Just have to prep the jugs for paint and I can get this top end back together.






Sent from my iPhone using Tapatalk

Offline Dnor72

  • Full Member
  • *
  • Posts: 83
Re: 1983 Nighthawk 550 resto
« Reply #8 on: May 19, 2017, 03:57:17 PM »
Decided to just continue with the strip down and finish the top end on the build up. Plus the engine is much easier to muscle around the garage sans jugs and head.

On the jack


Lump removed


PCd frame


Detailed engine



Sent from my iPhone using Tapatalk

Offline Marks78

  • Enthusiast
  • **
  • Posts: 103
Re: 1983 Nighthawk 550 resto
« Reply #9 on: May 20, 2017, 08:14:07 AM »
Nice progress on the project Dnor72! Wish I could progress as quickly with mine. Keep up the good work and enjoy the ride!  8)
Current Stable:
1978 CB750K
1982 XT200J
1982 XJ1100 Maxim
1985 V30 Magna
1998 VT1100 Spirit
2006 GoldWing

Offline Dnor72

  • Full Member
  • *
  • Posts: 83
1983 Nighthawk 550 resto
« Reply #10 on: May 20, 2017, 08:47:55 AM »
Nice progress on the project Dnor72! Wish I could progress as quickly with mine. Keep up the good work and enjoy the ride!  8)

Thanks Marks. I've had some time off recently and I've really been going at it. Only my second resto, but I'm 1% better at predicting what I'll need for parts so that I can get out in front of it. Waiting on parts takes so much time.


Sent from my iPhone using Tapatalk
« Last Edit: May 20, 2017, 11:07:15 AM by Dnor72 »

Offline Dnor72

  • Full Member
  • *
  • Posts: 83
Re: 1983 Nighthawk 550 resto
« Reply #11 on: May 23, 2017, 04:35:03 PM »
Got the engine in the PCd frame, started wiring it up.






Sent from my iPhone using Tapatalk

Offline Dnor72

  • Full Member
  • *
  • Posts: 83
Re: 1983 Nighthawk 550 resto
« Reply #12 on: May 26, 2017, 07:56:24 PM »
Everything but the brake lights and rear winkers wired. Put the battery in and the stuff in the front did what it should... headlight, horn, signals. So many wires and connectors stuffed behind that horn.




Sent from my iPhone using Tapatalk

Offline Dnor72

  • Full Member
  • *
  • Posts: 83
Re: 1983 Nighthawk 550 resto
« Reply #13 on: May 26, 2017, 07:57:52 PM »
Gauges back together, LEDs in the instrument cluster. 



Sent from my iPhone using Tapatalk

Offline grcamna2

  • Not a
  • Really Old Timer ...
  • *******
  • Posts: 15,229
  • I love to restore & travel. Keep'em Going Strong !
Re: 1983 Nighthawk 550 resto
« Reply #14 on: May 26, 2017, 08:37:51 PM »
Great work on that beauty !  8)
Does the CB550SC Nighthawk have 16) hydraulic lifters like it's bigger sibling the CB650SC ?
75' CB400F/'bunch o' parts' & 81' CB125S modded to a 'CB200S'
  I love the small ones too !
Do your BEST...nobody can take that away from you.

Offline Dnor72

  • Full Member
  • *
  • Posts: 83
Re: 1983 Nighthawk 550 resto
« Reply #15 on: May 27, 2017, 06:18:30 AM »
Great work on that beauty !  8)
Does the CB550SC Nighthawk have 16) hydraulic lifters like it's bigger sibling the CB650SC ?
Thanks grcamna2. It does have the 16 hydraulic lifters.



It's a bit of a weirdo bike, one year only. It also shares the head and cams with the 1983+ CB650SC. Lots of common parts in the engine.


Sent from my iPhone using Tapatalk

Offline grcamna2

  • Not a
  • Really Old Timer ...
  • *******
  • Posts: 15,229
  • I love to restore & travel. Keep'em Going Strong !
Re: 1983 Nighthawk 550 resto
« Reply #16 on: May 27, 2017, 07:30:22 AM »
I have had small experience w/ an 83' CB650SC w/ some clogged/collapsing hydraulic lifters.. I gave the customer a price(I quoted replacing all of them..)to fix the bike and he didn't come back.The bike wouldn't run very well the way it was.The owners need to use quality oil and change it regularly on these excellent high performance engines and that's rare w/ most used bike buyers.
Those lifters do get sludge,etc. in them that clogs them and then they don't work too well.I have heard of one person who removed them and somehow manually cleaned/pumped them out and he didn't have any more problems.
75' CB400F/'bunch o' parts' & 81' CB125S modded to a 'CB200S'
  I love the small ones too !
Do your BEST...nobody can take that away from you.

Offline Dnor72

  • Full Member
  • *
  • Posts: 83
Re: 1983 Nighthawk 550 resto
« Reply #17 on: May 27, 2017, 07:36:15 AM »
I have had small experience w/ an 83' CB650SC w/ some clogged/collapsing hydraulic lifters.. I gave the customer a price(I quoted replacing all of them..)to fix the bike and he didn't come back.The bike wouldn't run very well the way it was.The owners need to use quality oil and change it regularly on these excellent high performance engines and that's rare w/ most used bike buyers.
Those lifters do get sludge,etc. in them that clogs them and then they don't work too well.I have heard of one person who removed them and somehow manually cleaned/pumped them out and he didn't have any more problems.
The Honda service manual has a procedure using kerosene and a 1/16" drill bit to submerge them and pump the sludge and bubbles out. I haven't gotten there yet.


Sent from my iPhone using Tapatalk

Offline grcamna2

  • Not a
  • Really Old Timer ...
  • *******
  • Posts: 15,229
  • I love to restore & travel. Keep'em Going Strong !
Re: 1983 Nighthawk 550 resto
« Reply #18 on: May 27, 2017, 07:47:10 AM »
That's nice that the oem service manual has that procedure in it Dnor.
75' CB400F/'bunch o' parts' & 81' CB125S modded to a 'CB200S'
  I love the small ones too !
Do your BEST...nobody can take that away from you.

Offline Dnor72

  • Full Member
  • *
  • Posts: 83
1983 Nighthawk 550 resto
« Reply #19 on: May 27, 2017, 08:16:57 AM »
That's nice that the oem service manual has that procedure in it Dnor.
I haven't found a whole lot of resources online for these bikes. The Nighthawk forums aren't nearly as active as SOHC4 is.


Sent from my iPhone using Tapatalk

Offline Dnor72

  • Full Member
  • *
  • Posts: 83
Re: 1983 Nighthawk 550 resto
« Reply #20 on: May 28, 2017, 12:21:39 PM »
Prepped the front wheel for paint after cleaning up the aluminum colored bits. Good times.




Sent from my iPhone using Tapatalk

Offline Dnor72

  • Full Member
  • *
  • Posts: 83
Re: 1983 Nighthawk 550 resto
« Reply #21 on: May 29, 2017, 08:57:57 AM »
Annnnnd, the result.






Now on to the rear.


Sent from my iPhone using Tapatalk

Offline grcamna2

  • Not a
  • Really Old Timer ...
  • *******
  • Posts: 15,229
  • I love to restore & travel. Keep'em Going Strong !
Re: 1983 Nighthawk 550 resto
« Reply #22 on: May 29, 2017, 10:54:56 AM »
That wheel looks nice  8)
75' CB400F/'bunch o' parts' & 81' CB125S modded to a 'CB200S'
  I love the small ones too !
Do your BEST...nobody can take that away from you.

Offline Dnor72

  • Full Member
  • *
  • Posts: 83
Re: 1983 Nighthawk 550 resto
« Reply #23 on: May 29, 2017, 11:24:05 AM »
That wheel looks nice  8)
Thanks grcamna2. The masking was mind numbing. Came out pretty decent though.


Sent from my iPhone using Tapatalk

Offline grcamna2

  • Not a
  • Really Old Timer ...
  • *******
  • Posts: 15,229
  • I love to restore & travel. Keep'em Going Strong !
Re: 1983 Nighthawk 550 resto
« Reply #24 on: May 29, 2017, 11:32:45 AM »
A lightweight cast aluminum oem tubeless wheel;they are very low-maintenance and you've dressed it up.
75' CB400F/'bunch o' parts' & 81' CB125S modded to a 'CB200S'
  I love the small ones too !
Do your BEST...nobody can take that away from you.

Offline Dnor72

  • Full Member
  • *
  • Posts: 83
Re: 1983 Nighthawk 550 resto
« Reply #25 on: May 30, 2017, 04:47:30 PM »
Mounted, balanced and on.




Sent from my iPhone using Tapatalk

Offline rb550four

  • Master
  • *****
  • Posts: 2,473
  • I'm nobody's slave and nobody's master
Re: 1983 Nighthawk 550 resto
« Reply #26 on: May 31, 2017, 04:10:45 PM »
This project is coming along nicely.
I have the same machine at home...got it up and running , it's way quicker than earlier 550s, mine seems to have a collapsed lifter...waiting to see how the kero soaking works for you. Parts are... well, there are no parts available for these. It was a 3 year machine in BC but only a one year wonder in the US, but there is no extra parts in BC either.
  The 650 engine shares many of the same parts, transmission gearing is different and preferred over the 550.
  The 650 engine is a direct fit into the lighter 550 frame in these years too. I have one of the 650 s here  at the house that has been begging to get into the lighter 550 frame but I must admit that I really like the dual front disc on the 650and a couple of other beefier items not found on the 550. The carbs are different but the air box is the same so the boots to the box has to be changed at engine swap time....everything else swaps out direct, can't ask for easier than that. I just can't understand why I haven't done it here already....maybe this summer.
  Nice job.
A few Honda 500's, a few Honda 550's, a few Honda 650's, '72 cb 450, a couple 500/550/650 hybrids, and 2001 750. 
  550 Snowbike -Somebody had to do it.
  http://forums.sohc4.net/index.php/topic,101678.0.html             
http://forums.sohc4.net/index.php/topic,137317.msg1550907.html#msg1550907

Offline Dnor72

  • Full Member
  • *
  • Posts: 83
1983 Nighthawk 550 resto
« Reply #27 on: May 31, 2017, 04:50:18 PM »
This project is coming along nicely.
I have the same machine at home...got it up and running , it's way quicker than earlier 550s, mine seems to have a collapsed lifter...waiting to see how the kero soaking works for you. Parts are... well, there are no parts available for these. It was a 3 year machine in BC but only a one year wonder in the US, but there is no extra parts in BC either.
  The 650 engine shares many of the same parts, transmission gearing is different and preferred over the 550.
  The 650 engine is a direct fit into the lighter 550 frame in these years too. I have one of the 650 s here  at the house that has been begging to get into the lighter 550 frame but I must admit that I really like the dual front disc on the 650and a couple of other beefier items not found on the 550. The carbs are different but the air box is the same so the boots to the box has to be changed at engine swap time....everything else swaps out direct, can't ask for easier than that. I just can't understand why I haven't done it here already....maybe this summer.
  Nice job.
Thanks rb550four.

Yayyyy. Another 550 NH on the board! I did get to ride this one a little before breaking it down and it is certainly not slow. I think it's going to be a great rider.

eBay has tons of used parts and when I really need something I'm there trying to find the best of what's available. It's challenging buying greasy parts sight unseen. Like you said there are NO new parts for this bike. I found piston rings on CMSNL, bearings at David Silver, a new NOS tensioner and repro front signals on eBay and that is about it for new bits. Everything else is reconditioned and/or rebuilt. I did pay attention when buying the bike as to what was looking good (chrome, exhaust, body panels, wheels, seat, etc) knowing some items would be hard to get.

What are the symptoms of a collapsed lifter? Mine ran rough and was pretty noisy before taking off the top end. I think it's the tensioner/cam chain, but ya never know. I do like that dual disc up front on the CB650SC.


Sent from my iPad using Tapatalk
« Last Edit: May 31, 2017, 04:59:52 PM by Dnor72 »

Offline Dnor72

  • Full Member
  • *
  • Posts: 83
1983 Nighthawk 550 resto
« Reply #28 on: May 31, 2017, 05:02:18 PM »
Here's the tappet page from my Clymer:


And Honda:


The Honda manual mentions a special tool while the Clymer shows an alternative method.


Sent from my iPhone using Tapatalk
« Last Edit: June 01, 2017, 09:53:22 AM by Dnor72 »

Offline Dnor72

  • Full Member
  • *
  • Posts: 83
Re: 1983 Nighthawk 550 resto
« Reply #29 on: June 02, 2017, 08:05:51 PM »
Rear wheel painted, bearings installed, tire mounted and balanced. Waiting on the swing arm  from the powder coater. Guess I'll do some painting on the side covers and tail section this weekend.




Sent from my iPhone using Tapatalk

Offline Dnor72

  • Full Member
  • *
  • Posts: 83
1983 Nighthawk 550 resto
« Reply #30 on: June 07, 2017, 05:38:27 PM »
Rear end back on. We have a roller. Top end is next.








Sent from my iPhone using Tapatalk
« Last Edit: June 07, 2017, 05:44:09 PM by Dnor72 »

Offline grcamna2

  • Not a
  • Really Old Timer ...
  • *******
  • Posts: 15,229
  • I love to restore & travel. Keep'em Going Strong !
Re: 1983 Nighthawk 550 resto
« Reply #31 on: June 07, 2017, 07:10:12 PM »
Yeah  8)
75' CB400F/'bunch o' parts' & 81' CB125S modded to a 'CB200S'
  I love the small ones too !
Do your BEST...nobody can take that away from you.

Offline rb550four

  • Master
  • *****
  • Posts: 2,473
  • I'm nobody's slave and nobody's master
Re: 1983 Nighthawk 550 resto
« Reply #32 on: June 07, 2017, 08:19:02 PM »
Mine was a mess when I bought it, like usual, beaten, run hard and put away wet. PO did some work to it, all wrong, also usual. I did clean the carbs ,new plugs, oil , the usual stuff.... got it running and sync'd the carbs properly hoping the tapping sound would go away. It didn't, but even so I wanted to feel it on the road to see if I thought that I might be able to like it as much as the rest of the 550s around here, immediately notice that there was no lack of power by comparison , even with with an engine issue.
  Tinkered a bit more with it ( but not enough to blow it up) and it only got faster. I notice that top gear was a little less exiting than the rest of them leading up to it ,went on line and asked the night hawk guys what was up and found out about the differences between the 550 and 650 gearing and 650 implant potential. I hate the handle bars, so I had an extra set that are lower and put them on....there hasn't been a decent set of stock bars on a Honda since 1979 650 as far as I know..
  Yes , I have that manual and did read bleeding the lifters, I just haven't done it yet cause I was distracted with the idea of 84 650 engine transplant with improved gears, and for some reason work always gets in the way of a better time that could be spent with motorcycles. but it's still on the list of things to do.
 Your machine is coming along nicely.
A few Honda 500's, a few Honda 550's, a few Honda 650's, '72 cb 450, a couple 500/550/650 hybrids, and 2001 750. 
  550 Snowbike -Somebody had to do it.
  http://forums.sohc4.net/index.php/topic,101678.0.html             
http://forums.sohc4.net/index.php/topic,137317.msg1550907.html#msg1550907

Offline Dnor72

  • Full Member
  • *
  • Posts: 83
1983 Nighthawk 550 resto
« Reply #33 on: June 08, 2017, 01:36:50 PM »
Getting my paint on.


















Do some wet sanding this week.

Sent from my iPhone using Tapatalk
« Last Edit: June 11, 2017, 06:55:21 PM by Dnor72 »

Offline Dnor72

  • Full Member
  • *
  • Posts: 83
1983 Nighthawk 550 resto
« Reply #34 on: June 14, 2017, 06:03:11 AM »
Got the rear cowl/grab rails on and the signals and brake light connected.






Sent from my iPhone using Tapatalk

Offline Dnor72

  • Full Member
  • *
  • Posts: 83
1983 Nighthawk 550 resto
« Reply #35 on: July 05, 2017, 01:39:02 PM »
Pretty much done with the Nighthawk. Runs very well, haven't got it up to speed yet. Will register it next week. Had a couple oil leaks to track down, one from the pan and one from a cam puck. Gonna be a great rider.


Sent from my iPhone using Tapatalk
« Last Edit: July 06, 2017, 09:50:40 AM by Dnor72 »

Offline Dnor72

  • Full Member
  • *
  • Posts: 83
Re: 1983 Nighthawk 550 resto
« Reply #36 on: July 05, 2017, 01:48:44 PM »
It ended up being more a refurb than a resto. The only new parts on it, besides bearings, tires, brakes, piston rings and the cam chain tensioner are the front and rear signals. Everything else is original and refurbed to be as good as it can be without replacement. It looks good, but has some flaws.

Offline grcamna2

  • Not a
  • Really Old Timer ...
  • *******
  • Posts: 15,229
  • I love to restore & travel. Keep'em Going Strong !
Re: 1983 Nighthawk 550 resto
« Reply #37 on: July 05, 2017, 03:12:48 PM »
Thanks for sharing the journey Dnor  :)
75' CB400F/'bunch o' parts' & 81' CB125S modded to a 'CB200S'
  I love the small ones too !
Do your BEST...nobody can take that away from you.

Offline SOHC4 Cafe Racer Fan

  • Speak up, Whipper-Snapper! I'm a
  • Really Old Timer ...
  • *******
  • Posts: 15,733
  • SOHC/4 Member #1235
Re: 1983 Nighthawk 550 resto
« Reply #38 on: July 05, 2017, 04:35:05 PM »
That came out nice. Enjoy riding!
1975 CB550K1 "Blue" Stockish Restomod (http://forums.sohc4.net/index.php?topic=135005.0)
1975 CB550F1 frame/CB650 engine hybrid "The Hot Mess" (http://forums.sohc4.net/index.php/topic,150220.0.html)
2008 Triumph Thruxton (http://forums.sohc4.net/index.php/topic,190956.0.html)
2014 MV Agusta Brutale Dragster 800
2015 Yamaha FZ-09 (http://forums.sohc4.net/index.php/topic,186861.0.html)

"There are some things nobody needs in this world, and a bright-red, hunch-back, warp-speed 900cc cafe racer is one of them — but I want one anyway, and on some days I actually believe I need one.... Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba." Hunter S. Thompson, Song of the Sausage Creature, Cycle World, March 1995.  (http://www.latexnet.org/~csmith/sausage.html and https://magazine.cycleworld.com/article/1995/3/1/song-of-the-sausage-creature)

Sold/Emeritus
1973 CB750K2 "Bionic Mongrel" (http://forums.sohc4.net/index.php?topic=132734.0) - Sold
1977 CB750K7 "Nine Lives" Restomod (http://forums.sohc4.net/index.php?topic=50490.0) - Sold
2005 RVT1000RR RC51-SP2 "El Diablo" - Sold
2016+ Triumph Thruxton 1200 R (http://forums.sohc4.net/index.php/topic,170198.0.html) - Sold