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Author Topic: Nighthawk CB450 (New Age Bobber/Shortchop)  (Read 16007 times)

Offline Aetsh

  • Posts: 754
    • Youngstown Soul
Re: Nighthawk CB450 (New Age Bobber/Shortchop)
« Reply #15 on: May 10, 2010, 21:23:25 »
haven't replied in a while with the school semester ending.  I cleaned the carbs out completely and now she runs amazing.  So now im just finishing the little things.  I really like that seat idea you showed i might do something with the extra plate in the back.

one question i do have is about the front shocks:
they wont hold air for long and oil is leaking out the tops so i figured id pull them apart and rebuild them.  This has been the hardest part of bringing this bike back to life so far.  Does anyone have expierance with rebuilding these shocks.  How did you get the locktited bolt out of the bottom do i really need to remove the bolt or can I pull the C clip out of the top and just replace the oil seal.

-zack-

Great looking bike man! Mine is nearly the same (Cm400) so I'm loving your progress!

I'm having the same problem with my forks, I can air them up, but it doesn't last long, and they tend to "sag" about an inch..I'm really not leaking oil tho  ???

Offline mrkil

  • Posts: 550
Re: Nighthawk CB450 (New Age Bobber/Shortchop)
« Reply #16 on: Jul 14, 2010, 11:43:28 »
diggin this back up.

any progress since the spring?
i was lookin forward to this one

Offline Fix

  • Site Supporter
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  • Posts: 1379
  • I just want to ride my motor-cicle.
    • Ugly bike
Re: Nighthawk CB450 (New Age Bobber/Shortchop)
« Reply #17 on: Jul 14, 2010, 16:49:09 »
I kept the swingarm, so I solid mounted to the frame.  This is a harley seat, I believe it's off a dyna.  My bikes a little similar to what you're doing, so I thought it might help.

'78 Yamaha XS11

In the end all that really matters is that YOU build a bike that YOU think is radness all around.

Offline JRK5892

  • Posts: 9649
    • The Powder Pro
Re: Nighthawk CB450 (New Age Bobber/Shortchop)
« Reply #18 on: Jul 20, 2010, 20:19:31 »
def a dyna st bob seat!
Joe
"your life is an occasion, Stand up to it"
www.thepowderpro.com

recent builds: Hd street bob, TX cafe, KZ bratt, Goldwing tour, bratt wing, st fighter, road king, vriago bobber, chop, FXD, 1200 sporty, 1200xl sporty, GSXR, Royal enfield.. and more

Offline boisdarc

  • Posts: 80
Re: Nighthawk CB450 (New Age Bobber/Shortchop)
« Reply #19 on: Jul 20, 2010, 23:59:45 »
I dig it - are you putting shorter shocks on it?
if I can I only buy rearden steel and danconia copper.

Offline zlittell

  • Posts: 44
Re: Nighthawk CB450 (New Age Bobber/Shortchop)
« Reply #20 on: Sep 18, 2010, 00:34:51 »
sorry I haven't been on in a while.  The bike hasn't had much progress really :(

I am close though, I still need:
Headlight
Turn Signals
Set of working carbs
Oil seals for forks
Seat installed

I actually took the forks apart today and just need to go buy the seals and oil!

I found the solo seat at a Harley tent sale on my trip to Seattle Washington it was only like $20 out the door!  I will be removing the pan since it doesn't fit and either leaving it off or having one built by my dads friend.

I am still missing the air cutoff assembly on the side of the one carb which is why I am thinking of just buying a working set that someone has already rebuilt.  I gotta fix the floats on mine anyways.  So its either get a donor pair to snatch those parts from and set the float height myself or find a good deal on rebuilt ones whichever comes first.

Hopefully get it fully running this winter and then ill clean it up and rattle can it while I wait to ride!



-Zack-

Offline zlittell

  • Posts: 44
Re: Nighthawk CB450 (New Age Bobber/Shortchop)
« Reply #21 on: Aug 20, 2012, 23:39:42 »
Realized I have been posting in the wrong thread  ::) so heres the update I posted there to let you guys know where I am at.
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
I just got an internship and am happy to say I have money to start working on this gal again.  Hopefully more to come!

I am going to be mounting the engine up on the bench and working on that first.  Going through all the maintenance and replacing stuff.  Then start mocking it back up and buying pieces as I determine they need replaced or when I decide I need something.  Then tearing it back down and having the frame powder-coated, everything painted, and any other cosmetics finished.

I will be making my own wiring harness with just the bare minimums that allows for the new configuration of switches and such.

I will post pictures as I find time to work on it between school and work!
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Does anyone have any suggestions for rejetting with pods and straight pipes.  All I have heard is 150 main jet.  Any tips on what to buy?

Any tips on cleaning the engine without tearing it down?  Also what about painting it without tearing it down.  Really don't want to rip through the engine since I am not really skilled in that.

Should I pull the valve cover and heads to check the pistons and cylinders?  Should I also replace the gaskets in these areas.  They don't leak, but I am trying to give the engine a good look over even though it does run.  I feel like it cant hurt to put it back on the frame nice and clean in the top end!  Or am I asking for trouble?

Also if anyone can help me out i have posted a WTB.  I am looking for the cover and possibly internals for my left carb Air Cutoff Valve

Offline zlittell

  • Posts: 44
Re: Nighthawk CB450 (New Age Bobber/Shortchop)
« Reply #22 on: Aug 23, 2012, 08:50:07 »
well found the parts i was looking for.  Went through the carbs and im missing a couple seals and some of the rubber is squishy possibly from sitting in varnish.  Gonna buy a rebuild kit and im thinking just ebay for $80 anyone have any other suggestions.

Also where does everyone buy their jets?  Most of the places i have found just have parts numbers for the jets, how do i know which ones fit my bike?

Also do i need to increase the size of all the jets? Right now i have a #115 main which has to be wayyyyy too lean for the mods ive done

Offline Maritime

  • Site Supporter
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  • Posts: 5422
Re: Nighthawk CB450 (New Age Bobber/Shortchop)
« Reply #23 on: Aug 23, 2012, 09:07:18 »
I've sold my 450 so I can;t check but I had pods and Emgo's on the factory head pipes and I think I was at 130 for the Mains and 98?? on the slows. It ran pretty good and was just a touch rich but never fouled out plugs.  I got my jets from a local shop, they had a Keihin parts book and I just ordered jets from 125-135 at 2.00 ea and then started tuning. the 130's worked best and rule of thumb for a starting point is go up 5 for each mod, 5 for pods and 5 for exhaust  My bike started with a 120 main in it so it made sense I ended with a 130.  You likely won't need to change out the slow jet, but will have to adjust the mixture screws.  Pods don't effect low throttle settings where the slow does most of the work.  Cheers,

Maritime
My Build: My full figured girl: http://www.dotheton.com/forum/index.php?topic=13950.msg135199#msg135199
CX500 Low budget Bobber : http://www.dotheton.com/forum/index.php?topic=43617.0
"Beer makes you feel the way you ought to feel without beer" -Henry Lawson
"Beer is proof that God loves us and wants us to be happy." - Thomas Jefferson

Offline Maritime

  • Site Supporter
  • *
  • Posts: 5422
Re: Nighthawk CB450 (New Age Bobber/Shortchop)
« Reply #24 on: Aug 23, 2012, 09:18:35 »
Realized I have been posting in the wrong thread  ::) so heres the update I posted there to let you guys know where I am at.
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
I just got an internship and am happy to say I have money to start working on this gal again.  Hopefully more to come!

I am going to be mounting the engine up on the bench and working on that first.  Going through all the maintenance and replacing stuff.  Then start mocking it back up and buying pieces as I determine they need replaced or when I decide I need something.  Then tearing it back down and having the frame powder-coated, everything painted, and any other cosmetics finished.

I will be making my own wiring harness with just the bare minimums that allows for the new configuration of switches and such.

I will post pictures as I find time to work on it between school and work!
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Does anyone have any suggestions for rejetting with pods and straight pipes.  All I have heard is 150 main jet.  Any tips on what to buy?

Any tips on cleaning the engine without tearing it down?  Also what about painting it without tearing it down.  Really don't want to rip through the engine since I am not really skilled in that.

Should I pull the valve cover and heads to check the pistons and cylinders?  Should I also replace the gaskets in these areas.  They don't leak, but I am trying to give the engine a good look over even though it does run.  I feel like it cant hurt to put it back on the frame nice and clean in the top end!  Or am I asking for trouble?

Also if anyone can help me out i have posted a WTB.  I am looking for the cover and possibly internals for my left carb Air Cutoff Valve
I would check compression, if it is good, and there are no leaks, leave the head on.  I had to pull the head on one of my 450 motors and I ended up with a mess.  2 of the head bolts are not oil channels like the rest and depending on the life your bike had previous to you they can be rusted into the bottom end and mine were. One broke off in the bottom end and the other completely stripped out.  I was pulling the head to fix the cam tensioner bolt as it was stripped and ended up after adding up the cost, parting that engine out and gettting another for the bike.  Was not fun.  If compression is bad, you can pull the head and hone and new rings etc.  I think the parts are all still available.

If compression is good, set the valves, they are easy if you take your time, use a feeler guage and set them right in the middle of the specs.  you can clean and paint the motor without taking it apart. Just mask off the parts you don't want to paint. 

Cheers
My Build: My full figured girl: http://www.dotheton.com/forum/index.php?topic=13950.msg135199#msg135199
CX500 Low budget Bobber : http://www.dotheton.com/forum/index.php?topic=43617.0
"Beer makes you feel the way you ought to feel without beer" -Henry Lawson
"Beer is proof that God loves us and wants us to be happy." - Thomas Jefferson

Offline zlittell

  • Posts: 44
Re: Nighthawk CB450 (New Age Bobber/Shortchop)
« Reply #25 on: Aug 25, 2012, 22:13:55 »
Disassebled the carbs for their second cleaning.  Got kind of held up this weekend since I didn't want to spend all my money haha and had to replace the lower ball joint in my work car :(.  Which still isn't finished, but being pressed at my buddies house.  Was gonna clean the carbs tomorrow in my friends dads parts cleaner but that will have to wait till next weekend now.

Figured out a list of parts that should really get me set up on the engine and carbs!  Other than possible syncing and rejetting once I have it back in the frame.
Degreaser
Accelerator Pump Rebuild Kit
Carb Rebuild Kit
Bowl Drain/Overflow screws and seals
Top Cover Screws
Air Cutoff Cover Screws
VHT High Temp Paint
Exhaust Header Nuts
Valve Cover Bolt Seals
Floats

is my list of stuff to buy immediately after my next paycheck or as soon as I can.  Which should put me WELL on track for finishing motor stuff up.  Leaving just Clamps for Overflow Tubes, Intake Boots and Bolts, Exhaust Header Nuts, Valve Cover Bolt Seals, Pod Filters, and Overflow and Gas tank Lines left on the list for various things to pick up with any extra money or my next paycheck.  This all should keep me some what busy for a couple weekends.  I am hoping to get her degreased and painted before it starts to get too cold.

-zack-
« Last Edit: Aug 25, 2012, 22:15:37 by zlittell »

Offline zlittell

  • Posts: 44
Re: Nighthawk CB450 (New Age Bobber/Shortchop)
« Reply #26 on: Aug 27, 2012, 15:37:47 »
Whats the opinion on durability of spray on paints.  I will be using VHT for all of it.  I dont have a choice on engine im not breaking it done to get powder coated.  But like brake calipers, frame, rims, etc.  I would rather not have to save up for a powder coat but if its that much of a difference i will have to.

Sent from my DROIDX using Tapatalk 2

Offline JRK5892

  • Posts: 9649
    • The Powder Pro
Re: Nighthawk CB450 (New Age Bobber/Shortchop)
« Reply #27 on: Aug 27, 2012, 15:45:23 »
well i own a powder company so i always powder but on stuff like your calipers i would def powder them as paint will peel off... wheels i coat mainly because of durablility... on your frame you can get away with paint if you are really really careful with it... i would use an epoxy base paint on it however
Joe
"your life is an occasion, Stand up to it"
www.thepowderpro.com

recent builds: Hd street bob, TX cafe, KZ bratt, Goldwing tour, bratt wing, st fighter, road king, vriago bobber, chop, FXD, 1200 sporty, 1200xl sporty, GSXR, Royal enfield.. and more

Offline zlittell

  • Posts: 44
Re: Nighthawk CB450 (New Age Bobber/Shortchop)
« Reply #28 on: Aug 27, 2012, 16:19:15 »
Looks like i might just splurge and powder! Haha.  What about the engine how does that hold up to the heat.  My buddy used the vht on his autocross car and its been holding up but i dont know

Sent from my DROIDX using Tapatalk 2

Offline JRK5892

  • Posts: 9649
    • The Powder Pro
Re: Nighthawk CB450 (New Age Bobber/Shortchop)
« Reply #29 on: Aug 27, 2012, 16:56:57 »
i use dupi color 500* and it holds up awesome, just be sure you use the right paint, do not use 1200* as that cures in operation temp... your motor will never see close to that
Joe
"your life is an occasion, Stand up to it"
www.thepowderpro.com

recent builds: Hd street bob, TX cafe, KZ bratt, Goldwing tour, bratt wing, st fighter, road king, vriago bobber, chop, FXD, 1200 sporty, 1200xl sporty, GSXR, Royal enfield.. and more