Author Topic: 1983 Nighthawk 550 resto  (Read 7140 times)

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Offline Dnor72

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Re: 1983 Nighthawk 550 resto
« Reply #25 on: May 30, 2017, 04:47:30 PM »
Mounted, balanced and on.




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Offline rb550four

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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

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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.


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« Last Edit: May 31, 2017, 04:59:52 PM by Dnor72 »

Offline Dnor72

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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.


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« Last Edit: June 01, 2017, 09:53:22 AM by Dnor72 »

Offline Dnor72

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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.




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Offline Dnor72

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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.








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« Last Edit: June 07, 2017, 05:44:09 PM by Dnor72 »

Offline grcamna2

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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

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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

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1983 Nighthawk 550 resto
« Reply #33 on: June 08, 2017, 01:36:50 PM »
Getting my paint on.


















Do some wet sanding this week.

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« Last Edit: June 11, 2017, 06:55:21 PM by Dnor72 »

Offline Dnor72

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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.






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Offline Dnor72

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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.


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« Last Edit: July 06, 2017, 09:50:40 AM by Dnor72 »

Offline Dnor72

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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

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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

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Re: 1983 Nighthawk 550 resto
« Reply #38 on: July 05, 2017, 04:35:05 PM »
That came out nice. Enjoy riding!
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