A head shake is actually quite easy to diagnose and repair. 
First off, I feel bad for you about all the expense. I think you'll find out 
what REAL expense is if you do the 650 deal. 
Now, the head shake; do you have a windshield ? At 75, passing a large truck, 
that would be a major cause. Bad head bearings show up mostly at lower speeds 
(50~55) . Still, check for bad head bearings, tire pressures, AND, chain 
tension. A chain with a tight spot will cause a head shake. 
# a word about windshields; ever see a stop sign shaking in a high wind ? It 
loads and then pivots on it's axis and unloads one side, repeat , repeat, 
repeat. The windshield loads and then pivots the fork and unloads one side. The 
larger the shield, it gets worse. 
## on a complaint about head shake, AHM directs that all accessories be removed 
before diagnosis. (see above) [ yes, we will strip a Wing to only original 
components]
# improperly maintained chains that have a tight spot really shake a front end 
? Oh yeah. A chain drive is constantly pulling the back wheel to the left side 
and that twists the wheel to point right. Every time a tight spot yanks on the 
rear wheel, the tail wags the dog.  
"Wait for an older year" ??  NO, just an '83~'85 650. Later 750's maybe. I have 
two 700's 

--- On Fri, 7/3/09, Music and Nighthawk Nut <[email protected]> wrote:

From: Music and Nighthawk Nut <[email protected]>
Subject: [Nighthawk Lovers] Re: Trade my 85 450 for a 82 650??
To: "Nighthawk Motorcycle Lovers!" <[email protected]>
Date: Friday, July 3, 2009, 10:33 AM


Thankx Dennis for replying back:-) It would be a step up for me. I
will be able to find more parts for it if need be. The only reason I
am selling/trading it is because the other day when I got up to 75 to
go around a semi, the front end started shaking REALLY bad and I can't
find out why other than a fork problem and from what a Honda tech told
me would be expensive. He has worked on my 450 since I bought it last
year non-running and have spent $2100 on just work. I have done some
of the work, but needed help so... I am meeting the guy with the 650
Sun cause he is taking it to a bike shop to have it looked over and
get the tank creamed before he lets me see it. I will definitely hear
for the valve noise. So maybe wait huh for a older year??

On Jul 2, 9:00 pm, Dennis Hammerl <[email protected]> wrote:
> IMHO; I had a '82 CB650sc. A nice bike... just nice. no hydraulic valve 
> adjusters, five speed (not six) chain drive (not drive shaft) two valve / 
> single cam, cable operated clutch, just the last (best) of a run of 
> pedestrian four cylinder 650 bikes that started in'79. As a Honda technician, 
> I can say they had very few problems. There is one however, they tend to wear 
> the head cover and make valve noise. it can be cured with a procedure that is 
> somewhat costly. If it makes valve noise, I'd pass. Don't get me wrong, I 
> liked mine. Is it a step up for you ? Yes, but it's only about half of what 
> the '83~'85 bikes were. 21K is quite a bit for one of those. Mine had about 
> 8K on it when I sold it for $1100 back in '87.
> Me ? I'd wait for a good '85.
>
> --- On Thu, 7/2/09, Music and Nighthawk Nut <[email protected]> wrote:
>
> From: Music and Nighthawk Nut <[email protected]>
> Subject: [Nighthawk Lovers] Trade my 85 450 for a 82 650??
> To: "Nighthawk Motorcycle Lovers!" <[email protected]>
> Date: Thursday, July 2, 2009, 11:33 PM
>
> I have an offer on my 85 450 Nighthawk for an 82 650 Nighthawk. The
> 650 has 21000mi and just "needs the seat recovered" and possibly the
> master cylinder. My 450 needs another carb rebuild since the 1st guy
> didn't do it right the the gas tank creamed. It has 10685mi on it.
> Would it be a good trade since I do want a bigger bike??




      
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