Author Topic: CB 750 Rocker Arms  (Read 4026 times)

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Offline 754

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CB 750 Rocker Arms
« on: September 25, 2008, 07:55:36 PM »
Anyone out there resurfacing and regrinding the pads properly??

If not, I think it might be time..


 anyone seen any redone ?
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My next bike will be a ..ANFOB.....

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73 836cc.. Green, had it for 3 decades!!
Lost quite a few CB 750's along the way

Offline Jerry Rxman Griffin aka MuthaF'er

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Re: CB 750 Rocker Arms
« Reply #1 on: September 25, 2008, 09:34:26 PM »
Frank,

Doesn't Web Cams or Megacycle offer this service? I think this is a good topic. We need some before and after pictures and some technical info on when and why this should be done. 
As of today 3/13/2012 my original owner 75 CB750F has made it through 3 wives, er EX-wives. Free at last.  ;-)

Offline Sam Green Racing

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Re: CB 750 Rocker Arms
« Reply #2 on: September 25, 2008, 10:06:37 PM »
Megacycle do not guarantee their camshafts unless you use new or their resurfaced rockers.
When we fitted their cam, we bought new Honda ones from David Silver Spares cheaper than having them resurfaced.
Just a thought. ;)

Sam. ;)
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Offline MRieck

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Re: CB 750 Rocker Arms
« Reply #3 on: September 26, 2008, 04:28:30 AM »
 I just installed a set of hardwelded Megacycle rocker arms. They are nice but do not come cheaply.
Owner of the "Million Dollar CB"

Offline Terry in Australia

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Re: CB 750 Rocker Arms
« Reply #4 on: September 26, 2008, 06:20:53 AM »
I got some done by Wade Camshafts here in Oz, then a mate gave me a box full of really good ones for free. Oh well........... ;D
I was feeling sorry for myself because I couldn't afford new bike boots, until I met a man with no legs.

So I said, "Hey mate, you haven't got any bike boots you don't need, do you?"

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Offline Jerry Rxman Griffin aka MuthaF'er

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Re: CB 750 Rocker Arms
« Reply #5 on: September 26, 2008, 10:00:41 AM »
I just installed a set of hardwelded Megacycle rocker arms. They are nice but do not come cheaply.

Mike,

At what point do we know that we need to replace?
As of today 3/13/2012 my original owner 75 CB750F has made it through 3 wives, er EX-wives. Free at last.  ;-)

Offline MRieck

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Re: CB 750 Rocker Arms
« Reply #6 on: September 26, 2008, 01:21:25 PM »
I just installed a set of hardwelded Megacycle rocker arms. They are nice but do not come cheaply.

Mike,

At what point do we know that we need to replace?
When the hard chrome has been worn through (it usually happens on the edges of the rocker arm pad). You can see and feel it Jerry. I'd recommend them or new rocker arms if you are putting any decent performance cam. I think it was close to 500.00 for the Megacycle pieces (I supplied the rocker arms). The work was nice. GS1100/1150 rocker arms are notorious for wearing out especially if you put a performance cam in.
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Offline Jerry Rxman Griffin aka MuthaF'er

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Re: CB 750 Rocker Arms
« Reply #7 on: September 26, 2008, 09:04:59 PM »
Can anyone post a picture of a worn out rocker arm pad so the masses will have a reference?
As of today 3/13/2012 my original owner 75 CB750F has made it through 3 wives, er EX-wives. Free at last.  ;-)

Offline 754

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Re: CB 750 Rocker Arms
« Reply #8 on: September 26, 2008, 09:23:06 PM »
They have chunks missing on the surface..
Maker of the WELDLESS 750 Frame Kit
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Kelowna B.C.       Canada

My next bike will be a ..ANFOB.....

It's All part of the ADVENTURE...

73 836cc.. Green, had it for 3 decades!!
Lost quite a few CB 750's along the way

Offline Terry in Australia

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Re: CB 750 Rocker Arms
« Reply #9 on: September 27, 2008, 04:41:38 AM »
Can anyone post a picture of a worn out rocker arm pad so the masses will have a reference?

I've got a couple of worn out ones in my garage Jerry, if I remember I'll take a pic tomorrow. Cheers, Terry. ;D
I was feeling sorry for myself because I couldn't afford new bike boots, until I met a man with no legs.

So I said, "Hey mate, you haven't got any bike boots you don't need, do you?"

"Crazy is a very misunderstood term, it's a fine line that some of us can lean over and still keep our balance" (thanks RB550Four)

Offline Soos

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Re: CB 750 Rocker Arms
« Reply #10 on: September 27, 2008, 10:52:53 AM »
mabey hondaman can post one as well.
I sent him the rocker set that went with that cam i sent you terry.

To say the least it's noticeable to the feel and the eye. Or at least it was on that motor I had.


l8r
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Offline 754

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Re: CB 750 Rocker Arms
« Reply #11 on: September 27, 2008, 12:37:59 PM »
I would be happy with just the same surface Honda put on them.. guess I should check availability..

 It seems to last 50-100K in a lot of cases..
Maker of the WELDLESS 750 Frame Kit
dodogas99@gmail.com
Kelowna B.C.       Canada

My next bike will be a ..ANFOB.....

It's All part of the ADVENTURE...

73 836cc.. Green, had it for 3 decades!!
Lost quite a few CB 750's along the way

Offline MRieck

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Re: CB 750 Rocker Arms
« Reply #12 on: September 27, 2008, 01:57:37 PM »
mabey hondaman can post one as well.
I sent him the rocker set that went with that cam i sent you terry.

To say the least it's noticeable to the feel and the eye. Or at least it was on that motor I had.


l8r
I have about 2 dozen with bad pads. ;)
Owner of the "Million Dollar CB"

Offline Jerry Rxman Griffin aka MuthaF'er

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Re: CB 750 Rocker Arms
« Reply #13 on: September 27, 2008, 04:55:02 PM »
Mike,

Please let us all know why a bad pad is bad considering the valves can still be adjusted. These questions I am posing are all part of a complete rocker arm lesson our guys might enjoy. Perhaps a  nice tutorial with pictures could be included on our site.

Jerry
As of today 3/13/2012 my original owner 75 CB750F has made it through 3 wives, er EX-wives. Free at last.  ;-)

Offline bwaller

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Re: CB 750 Rocker Arms
« Reply #14 on: September 27, 2008, 08:27:32 PM »
When the hardened (I believe) stellite rocker pad surface is worn through the wear then accelerates quickly and the cam lobe soon follows. Bad news. I'm not a capable enough photog and can't seem to get a decent close-up.

Offline 754

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Re: CB 750 Rocker Arms
« Reply #15 on: September 27, 2008, 09:38:11 PM »
When it comes off in pieces it can take out the cam .

 Did anyone buy NOS in the last decade, how much did they cost??
Maker of the WELDLESS 750 Frame Kit
dodogas99@gmail.com
Kelowna B.C.       Canada

My next bike will be a ..ANFOB.....

It's All part of the ADVENTURE...

73 836cc.. Green, had it for 3 decades!!
Lost quite a few CB 750's along the way

Offline Terry in Australia

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Re: CB 750 Rocker Arms
« Reply #16 on: September 27, 2008, 10:37:11 PM »
About 40 bux each mate, from David Silver Spares. Actually, that's a great price, I paid about that much when I rebuilt my first K1 (with a cooked head and roasted cam and components) back in 1982. Cheers, Terry. ;D

http://www.davidsilverspares.co.uk/parts/
I was feeling sorry for myself because I couldn't afford new bike boots, until I met a man with no legs.

So I said, "Hey mate, you haven't got any bike boots you don't need, do you?"

"Crazy is a very misunderstood term, it's a fine line that some of us can lean over and still keep our balance" (thanks RB550Four)

Offline Soos

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Re: CB 750 Rocker Arms
« Reply #17 on: September 28, 2008, 08:27:56 AM »
Mike,

Please let us all know why a bad pad is bad considering the valves can still be adjusted. These questions I am posing are all part of a complete rocker arm lesson our guys might enjoy. Perhaps a  nice tutorial with pictures could be included on our site.

Jerry

The only 1 pad i've seen that was bad was on that lumpy stick terry's got, and it chewed 1/8+ inch off of one of the lobes.

There's adjustment a plenty....... but when it's wearing down your cam lobe(s), you loose a LOT of power in the long run.

Not to mention that stellite is EXTREMELY hard.
And the area it's in, of one pad goes, the flakes can migrate to another area in the head accelerating wear on other good lobes and pads.
The oil filter would catch most of it...after it's gone through your oil pump.
So that 1 lobe and wear pad are not the only victims from the damage.

l8r
« Last Edit: September 28, 2008, 08:33:50 AM by Soos »
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(61mm)652cc 1979 cb650

Offline HondaMan

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Re: CB 750 Rocker Arms
« Reply #18 on: September 28, 2008, 08:47:25 AM »
Mike,

Please let us all know why a bad pad is bad considering the valves can still be adjusted. These questions I am posing are all part of a complete rocker arm lesson our guys might enjoy. Perhaps a  nice tutorial with pictures could be included on our site.

Jerry

The only 1 pad i've seen that was bad was on that lumpy stick terry's got, and it chewed 1/8+ inch off of one of the lobes.

There's adjustment a plenty....... but when it's wearing down your cam lobe(s), you loose a LOT of power in the long run.

Not to mention that stellite is EXTREMELY hard.
And the area it's in, of one pad goes, the flakes can migrate to another area in the head accelerating wear on other good lobes and pads.
The oil filter would catch most of it...after it's gone through your oil pump.
So that 1 lobe and wear pad are not the only victims from the damage.

l8r

Once I was changing oil on the side of the road, during a trip (before the days when it polluted things...  ::) ), and while I was pouring in the new oil, a bee flew by and touched the Castrol 20w50. It sucked him right into the tank! I wondered about it for the next 5,000 miles. When I got home, the oil pressure had dropped almost 4 PSI at speed, so even a bug in the works is hard on an oil pump. I never found his bits in the filters, even though I tried. I guess the pump turned him into realy small pieces.

On the plus side, though: I've run that same oil pump this whole 130,000 miles. Now, it does not provide enough flow to push the on-filter bypass valve open, ever. And, if I ride for more than 40 minutes, the engine shows signs of poor lube at low speeds. Guess I'd better put in that (younger) pump that you sent me, Soos!
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Offline mystic_1

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Re: CB 750 Rocker Arms
« Reply #19 on: September 28, 2008, 08:51:10 AM »
Perhaps a synthetic bee would perform better?  ;)


I'd also like to see some pics of rocker arm pads that are considered too far gone to run.  Rockers that are coming apart in chunks would be an obvious sign, but what do they look like just before that happens?

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