Author Topic: What cam is this?  (Read 1226 times)

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Offline ev0lve

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What cam is this?
« on: August 09, 2015, 05:13:04 pm »
Not sure how to identify it - thoughts? Compared to a stock cam it looks a bit... lumpy  ;D

Came out of bike with a 900cc Henry Abe kit in it. No other work (I can identify) done to the head.





Let me know and thanks!

While I'm at it - nothing special about this designation on the rods? They look stock to me but WTH do I know? :)
« Last Edit: August 09, 2015, 05:19:04 pm by ev0lve »

Online scottly

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Re: What cam is this?
« Reply #1 on: August 09, 2015, 05:48:57 pm »
Megacycle 125-65? R.C. stands for Russ Colins...
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Offline BPellerine

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Re: What cam is this?
« Reply #2 on: August 09, 2015, 06:10:54 pm »
the rods are rc shotpeened rods said to be stronger than stock because of this,is the marking on the cam under the washer?I would have a look around that motor might have a ported head etc.bill
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Offline Retro Rocket

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Re: What cam is this?
« Reply #3 on: August 09, 2015, 06:15:01 pm »
Megacycle 125-65? R.C.

That was what I was thinking Scott, I wasn't sure so I sent him here to the hipo section, someone here will know for sure... ;)
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Online scottly

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Re: What cam is this?
« Reply #4 on: August 09, 2015, 06:19:51 pm »
It looks like one of the early billet cams, not a welded regrind. The info on Satanic Mechanic states "lobe clearancing needed"; after seeing those lobes, I can understand why. 
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Offline Jerry Rxman Griffin aka MuthaF'er

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Re: What cam is this?
« Reply #5 on: August 09, 2015, 06:42:59 pm »
RC used stock rods for 2 upgrades. Bushed small ends and/or larger bolts. Believe both were shot peened. Gonna be stronger than stock.

That's a BF cam!  ;) What's under the washer on the other end?

Is the rest of the engine OK? The HA kit OK?  Yes and yes, put it back together!! AFTER you do the head  ;D ;D The rings are available from Total Seal and I can get you the part numbers.
As of today 3/13/2012 my original owner 75 CB750F has made it through 3 wives, er EX-wives. Free at last.  ;-)

Offline ev0lve

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Re: What cam is this?
« Reply #6 on: August 09, 2015, 07:15:13 pm »
Like an easter egg with chocolate and unobtanium in it  :o

edit: I can't spell chocolate
« Last Edit: August 09, 2015, 08:19:46 pm by ev0lve »

Offline ev0lve

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Re: What cam is this?
« Reply #7 on: August 09, 2015, 07:53:56 pm »
The rings are available from Total Seal and I can get you the part numbers.

I've got this - same as yours?
Top Ring 203778
2nd ring 201336
Oil Ring 3 piece 001549

BF cam?

« Last Edit: August 09, 2015, 07:56:24 pm by ev0lve »

Online scottly

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Re: What cam is this?
« Reply #8 on: August 09, 2015, 08:08:37 pm »
Big F**king cam. ;)
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Offline Retro Rocket

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Re: What cam is this?
« Reply #9 on: August 09, 2015, 08:09:13 pm »
The rings are available from Total Seal and I can get you the part numbers.

BF cam?

Big F&%#ing cam... ;D  Beat me too it Scott... ;)
750 K2 1000cc
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Offline ev0lve

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Re: What cam is this?
« Reply #10 on: August 09, 2015, 08:09:39 pm »
Haw!

Online scottly

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Re: What cam is this?
« Reply #11 on: August 09, 2015, 08:16:19 pm »
Let us see some pics of the ports; with the goodies so far, one would guess that some head work had been done?
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Offline ev0lve

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Re: What cam is this?
« Reply #12 on: August 09, 2015, 08:18:16 pm »
I'll get some pics next time I'm down at the space - nothing I recall looking worked over but...

Offline Jerry Rxman Griffin aka MuthaF'er

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Re: What cam is this?
« Reply #13 on: August 09, 2015, 10:35:41 pm »
Henry made 2 pistons. Show me a pic of yours. If it's the 'other' one then we just need to verify the ring land width.
As of today 3/13/2012 my original owner 75 CB750F has made it through 3 wives, er EX-wives. Free at last.  ;-)

Offline ev0lve

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Re: What cam is this?
« Reply #14 on: August 10, 2015, 01:56:03 am »
Henry made 2 pistons. Show me a pic of yours. If it's the 'other' one then we just need to verify the ring land width.

These might do the trick?



Offline PeWe

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Re: What cam is this?
« Reply #15 on: August 10, 2015, 04:10:33 am »
That's the right one for mentioned rings from Total Seal.
Top Ring 203778
2nd ring 201336
Oil Ring 3 piece 001549

I have the older model that I need one oil ring for, 1 piece. See photos
The ring heights are same as my old HA 900. 1.5 1.5  2.8 mm
I'm not sure about the piston diameters. - Are your newer model of same diameter as mine?
Mine are over 67mm over the skirts.

If I know that I can order a ring kit too.

Answer from Total Seal end of June this year
"Those items would make up a 67mm set with a 1.5 1.5 2.8 combo. They are not in stock but can be made up. We would need about a week to complete and would be a cost of $196.87 for a 4cyl set."
« Last Edit: August 10, 2015, 04:12:33 am by PeWe »
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CB750 K2-75 Parts assembled to stock K2

Offline Jerry Rxman Griffin aka MuthaF'er

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Re: What cam is this?
« Reply #16 on: August 10, 2015, 02:37:07 pm »
would be a cost of $196.87 for a 4cyl set.  FUKN OUCH!! Gotta do what you gotta do sometimes..... ;) A heckuva lot cheaper than starting over with a new big bore kit though!

Yep, those are the same as the one I sent them a few years back to measure.
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: What cam is this?
« Reply #17 on: August 10, 2015, 06:37:59 pm »
Looks like a SCHLONG duration cam...
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Online scottly

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Re: What cam is this?
« Reply #18 on: August 10, 2015, 07:06:35 pm »
257* @ .040" lift. The rule of thumb is to add 50* to .050" lift to get advertised duration, but I've never seen a rule of thumb for .040"..
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Offline MRieck

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Re: What cam is this?
« Reply #19 on: August 10, 2015, 08:12:12 pm »
God those Abe things are big, clunky junky stuff. ;D
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Offline ev0lve

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Re: What cam is this?
« Reply #20 on: August 10, 2015, 08:40:26 pm »
It was a surprise for sure - guy I bought it from thought it "maybe" had an 836 kit in it.

Offline 754

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Re: What cam is this?
« Reply #21 on: August 10, 2015, 09:12:47 pm »
I bought a 900 kitted bike..turned. Out to be an oilburning 836....wahhhh...
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 ev0lve

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Re: What cam is this?
« Reply #22 on: August 10, 2015, 09:28:16 pm »
Did you want it?

Offline PeWe

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Re: What cam is this?
« Reply #23 on: August 10, 2015, 10:25:33 pm »
257* @ .040" lift. The rule of thumb is to add 50* to .050" lift to get advertised duration, but I've never seen a rule of thumb for .040"..

I timed my last cam, measured both at.040 and .050, the latter about 7° less on all numbers.
CB750 K6-76 1005cc JMR Billet block.
CB750 K2-75 Parts assembled to stock K2

 

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