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Author Topic: Valve Adjustment HELP (CB450)  (Read 386 times)

Offline redrover

  • Posts: 75
Valve Adjustment HELP (CB450)
« on: Jun 18, 2017, 00:04:10 »
So I need to adjust the valves on this newly acquired (neglected) 72 CB450, as well as adjust the cam chain tension and finally set the timing/points.

I managed to get the stripped screws out... Now is there a smooth way to remove those covers?

Also, how to get to the valve behind the points? Does the entire point assembly come off for that?

Thanks in advance to whoever can help me with this.

Offline redrover

  • Posts: 75
Re: Valve Adjustment HELP (CB450)
« Reply #1 on: Jun 18, 2017, 00:31:59 »
Ok so I managed to pry open one of the covers.

I've never adjusted valves on a 450... it looks way different than any other Honda valves I've seen/adjusted. Must be the torision bars!

Does anyone know how to adjust these valves?

« Last Edit: Jun 18, 2017, 00:44:26 by redrover »

Offline cxman

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Re: Valve Adjustment HELP (CB450)
« Reply #2 on: Jun 18, 2017, 07:30:43 »
stop what you are doing you have taken the wrong covers off

you have removed the adjuster

you need to get a HONDA SERVICE  manual

you can read this to start

you can screw this motor up right here and now if you are not careful

http://www.cb450stuff.com/manual/#Valve
1978 CX650 Super Deluxe
1979 XS1100 Special
1980 XS650
1980 cx500  The Beast
1983 GL650 i
1983 cx650 Custom
1973 CB450
1973 cb750
1980 cb750
1981 cb650
1982 cb900 c
1977  gl1000
1976 gl1000 LTD
 1983 GL1100 Nekid
and a bunch of others

Offline farmer92

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  • Posts: 380
Valve Adjustment HELP (CB450)
« Reply #3 on: Jun 18, 2017, 07:33:02 »
Those don't look like valves to me...

here's a manual if you didn't have one already. The procedure should be in there.
https://drive.google.com/file/d/0B_ZumJE59-T4YjUwNjllMjgtZDNlYi00ZTcxLTgyNDEtZmIxOTlmM2ZlNTZl/view?usp=drive_web&ddrp=1&hl=en#

Edit: cxman beat me to it,

« Last Edit: Jun 18, 2017, 07:34:39 by farmer92 »

Offline Flugtechnik

  • Posts: 3017
  • My bike is not transportation, it is a respite
    • Nixon and Me
Re: Valve Adjustment HELP (CB450)
« Reply #4 on: Jun 18, 2017, 13:06:43 »
Yes!!! STOP!!!  Those aren't the valve covers.  That is the bushing that the cam spins in.  The cam is no longer supported on one side.  You could possibly have altered the cam timing and dropped the cam follower off of the valve.

Trust me.  This is how I bent a valve in my engine and instigated a rebuild.

Listen to cxman.

The valve covers are the big covers on the front and back of the engine, sort of rectangular, right next to there.  Above the exhaust and above the carbs held on with 8 bolts each.  Take those off before you put this piece back on.  If you put this piece back on with the cam follower (valve tappet) next to the valve instead of on it, you will bend the valve and you will have to take the entire top end apart.
« Last Edit: Jun 18, 2017, 13:09:33 by Flugtechnik »

Offline cxman

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  • Posts: 2233
Re: Valve Adjustment HELP (CB450)
« Reply #5 on: Jun 18, 2017, 16:34:30 »
get some help from someone that knows this motor
1978 CX650 Super Deluxe
1979 XS1100 Special
1980 XS650
1980 cx500  The Beast
1983 GL650 i
1983 cx650 Custom
1973 CB450
1973 cb750
1980 cb750
1981 cb650
1982 cb900 c
1977  gl1000
1976 gl1000 LTD
 1983 GL1100 Nekid
and a bunch of others

Offline xulf13

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  • Posts: 979
  • West of Tennessee
Re: Valve Adjustment HELP (CB450)
« Reply #6 on: Jun 18, 2017, 18:35:26 »
Oh no! Too late. Hopefully he won't try to put the cam bushing back without actually checking that the valve tapets are in place and have not slid off the top of the valve stem and is now next to its side.

Dude, if you're not careful and try to put this "cover" back on hoping nothing happens, please stop. When this is removed the rocker arm usually slides off and falls next to the valve stem. And if you try to put the "cover" (really a bushing like Flug explained) you will bent the valve stem as you tighten those screws. If you wonder with it is harder to turn those screws in that expected then it's too late. Flight and I speak from experience. Not proud of it myself, but I learned a lot from this motor, from having to do a rebuild.


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Offline redrover

  • Posts: 75
Re: Valve Adjustment HELP (CB450)
« Reply #7 on: Jun 18, 2017, 19:10:59 »
Thank you everyone for chiming in... I have not tried putting that cover back on.

I feel like a complete idiot, first time doing this.

I will take off the front and back valve covers (correct ones this time) and take a photo to make sure that I have put everything back in correct place before putting everything back together.

Offline redrover

  • Posts: 75
Re: Valve Adjustment HELP (CB450)
« Reply #8 on: Jun 18, 2017, 20:48:07 »
So as you can see in the photo, the rocker arm did slide off and fall off down near the valve (I remember hearing it fall... I feel like shooting myself!). Good news is that I haven't forced anything and quite certain that I did not bend the valve.

Is there a way for me to realign it from this point without tearing into the head?

Is there anyone in San Francisco or Bay Area that would like to come over to help? (I can throw you some cash for down doing so).


Offline cxman

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Re: Valve Adjustment HELP (CB450)
« Reply #9 on: Jun 18, 2017, 21:08:08 »
im glad you didnt trash anything yet

wish you were closer i could help you with that

1978 CX650 Super Deluxe
1979 XS1100 Special
1980 XS650
1980 cx500  The Beast
1983 GL650 i
1983 cx650 Custom
1973 CB450
1973 cb750
1980 cb750
1981 cb650
1982 cb900 c
1977  gl1000
1976 gl1000 LTD
 1983 GL1100 Nekid
and a bunch of others

Offline redrover

  • Posts: 75
Re: Valve Adjustment HELP (CB450)
« Reply #10 on: Jun 18, 2017, 21:17:20 »
I can see exactly what I did now, I feel like such an idiot. The rocker is loose and not positioned like the other side.


Offline redrover

  • Posts: 75
Re: Valve Adjustment HELP (CB450)
« Reply #11 on: Jun 18, 2017, 21:22:39 »
YES! I managed to realign the rocker back into place and slide that rod back through!! When I spin it, it moves the rocker up and down smoothly on top of the valve!!

So should I put this side cover back on before adjusting the valves? Should I align the rocker a certain way before doing so?



Offline redrover

  • Posts: 75
Re: Valve Adjustment HELP (CB450)
« Reply #12 on: Jun 18, 2017, 21:26:19 »
Thanks cxman, I really appreciate it... although with all of your guys' help (and maybe a little luck), hopefully I can button this bad girl back together.

Regarding gauge size for the adjustment... .004 on the front valves and .003 on the rear valves?

Offline cxman

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  • Posts: 2233
Re: Valve Adjustment HELP (CB450)
« Reply #13 on: Jun 18, 2017, 22:15:11 »
yes to putting the support cover back on carefully dont force anything
read the manual to familiarize your self with setting these
 one of the adjusters is backwards to the rest
1978 CX650 Super Deluxe
1979 XS1100 Special
1980 XS650
1980 cx500  The Beast
1983 GL650 i
1983 cx650 Custom
1973 CB450
1973 cb750
1980 cb750
1981 cb650
1982 cb900 c
1977  gl1000
1976 gl1000 LTD
 1983 GL1100 Nekid
and a bunch of others

Offline Flugtechnik

  • Posts: 3017
  • My bike is not transportation, it is a respite
    • Nixon and Me
Re: Valve Adjustment HELP (CB450)
« Reply #14 on: Jun 19, 2017, 10:29:16 »
This picture helped me when setting mine.  Basically the little notch on the adjuster should point kind of away from the spark plug.




Since you took the Cam Cover (cam bushing) off, I would also recommend that you check your cam timing to make sure that the cam chain did not shift teeth on you when it dropped down.  When you set the cam timing, you are setting the position of the intake and exhaust cams relative to the position of the crank.  The procedure is probably on Hondatwins.net somewhere.  It is unlikely that the cam shifted, but is possible.