Author Topic: Yoshimura Cam help  (Read 1191 times)

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Offline 550Resto

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Yoshimura Cam help
« on: August 08, 2017, 12:43:51 pm »
Hello all, I recently was able to score a Yoshimura Cam from a co worker who had used this in his 78 550 back in the late 70s early 80s and then sold the bike but hung on to the cam. My question is what's a good way to remove the lithium grease he's applied as it's sticky and gooey at this point and is the slight what looks to be rust on one of the lobes ok?

He said he contacted Yoshimura back when he first got the bike and wanted a cam that he could run stock springs with and this is what they sent him. Part number looks to be 121. Not sure if anyone has info on this and whether or not it was a good deal at 50 bucks? He was also running a Kerker 4 to q, pods and 145 mains which was the only way he said for it to wake up. He gave me the pods and jets as well.

Any and all help appreciated!

Offline 550Resto

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Re: Yoshimura Cam help
« Reply #1 on: August 08, 2017, 12:44:30 pm »
Came in the original box to!

Offline flybox1

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Re: Yoshimura Cam help
« Reply #2 on: August 08, 2017, 12:45:21 pm »
I'd reach for the kerosene.
sweet deal  8)
'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

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Offline Stev-o

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Re: Yoshimura Cam help
« Reply #3 on: August 08, 2017, 02:59:28 pm »
Great deal!  The surface rust should not be an issue if you cant feel it with your finger after you get it clean.
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Offline sinister902

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Re: Yoshimura Cam help
« Reply #4 on: August 09, 2017, 05:35:02 am »
camrector recently dug up all the info on degreeing in this cam, hopefully he sees this and chimes in.

Offline MRieck

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Re: Yoshimura Cam help
« Reply #5 on: August 09, 2017, 05:38:17 am »
Every Yoshimura street cam I have installed use 105 lobe centers.
Owner of the "Million Dollar CB"

Offline 550Resto

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Re: Yoshimura Cam help Possibly Toast
« Reply #6 on: September 04, 2017, 07:46:21 am »
 :-\ So I got to removing the grease on the cam and found a love that looks shot. Is this whole cam no good now? Picture of the issue.

Offline BPellerine

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Re: Yoshimura Cam help
« Reply #7 on: September 04, 2017, 08:09:05 am »
if it will polish up without anything sticking up to score things up it may be ok,are the lobes in that condition?bill
1978 CB 750K ard and webers
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Offline BomberMann650

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Re: Yoshimura Cam help
« Reply #8 on: September 04, 2017, 08:58:35 am »
There bave been worse looking cams shared on here.
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Offline FunJimmy

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Re: Yoshimura Cam help
« Reply #9 on: September 04, 2017, 11:27:49 am »
Fill it up with JB Weld and run the wheels off it.
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Offline 754

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Re: Yoshimura Cam help
« Reply #10 on: September 04, 2017, 11:37:28 am »
It's an oil retention  groove.
All the parts in my 1914 twin HD look like that all over..
« Last Edit: September 04, 2017, 10:23:30 pm by 754 »
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Offline bwaller

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Re: Yoshimura Cam help
« Reply #11 on: September 04, 2017, 04:46:18 pm »
I wouldn't be happy with it.

Offline ts354

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Re: Yoshimura Cam help
« Reply #12 on: September 04, 2017, 05:29:37 pm »
Ha, I just took out my cam today and I have the same pitting on the lobes.  What causes it? 

Offline BPellerine

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Re: Yoshimura Cam help
« Reply #13 on: September 04, 2017, 05:33:31 pm »
rust forms on them if they have been sitting in a damp space for awhile.bill
1978 CB 750K ard and webers
another anfob

Offline SOHC4 Cafe Racer Fan

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Re: Yoshimura Cam help
« Reply #14 on: September 04, 2017, 05:57:09 pm »
I wouldn't be happy with it.

I wouldn't either.
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Offline MRieck

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Re: Yoshimura Cam help
« Reply #15 on: September 04, 2017, 06:07:51 pm »
Me either....it sucks man but reality is harsh.
Owner of the "Million Dollar CB"

Offline 754

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Re: Yoshimura Cam help
« Reply #16 on: September 04, 2017, 10:24:05 pm »
I pay 50 any day for it..
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 disco

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Re: Yoshimura Cam help
« Reply #17 on: September 04, 2017, 10:25:43 pm »
Looks to be off to the side a bit, so rocker won't be riding over worst area. Maybe a good machine shop could weld & re-grind?
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Offline 754

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Re: Yoshimura Cam help
« Reply #18 on: September 04, 2017, 10:29:16 pm »
Looks like the journal  looks like 95 percent intact to me..
 40 year old stuff .....get used to it , or get a modern bike..
 Things will get worse, time is not on our side...
« Last Edit: September 04, 2017, 11:01:19 pm by 754 »
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 mj1176

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Re: Yoshimura Cam help
« Reply #19 on: September 04, 2017, 10:50:04 pm »
if you decide you don't want it send it my way  8)

Offline uksparky

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Re: Yoshimura Cam help
« Reply #20 on: September 04, 2017, 11:10:03 pm »
Clean it up with 400 grit paper/wd40 and don't worry it's not spinning 16,000 rpm lol
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Offline 550Resto

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Re: Yoshimura Cam help
« Reply #21 on: September 05, 2017, 09:12:34 am »
Is anyone interested in this cam? I don't think it'll be the route I'm taking and if someone else would like to see if they can get it fixed or repaired I'd be willing to let it go cheap.

Offline 754

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Re: Yoshimura Cam help
« Reply #22 on: September 05, 2017, 09:17:58 am »
60 bux plus shipping.. .is my offer....and I don't have a bike that it fits.
I would have no qualms running it..
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 Bodi

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Re: Yoshimura Cam help
« Reply #23 on: September 05, 2017, 09:35:18 am »
I would go over it with an oiled flat fine India stone to remove any high spots and then use it with no worries. There's lots of good surface left, your rockers will be worn in to the original cam anyway, it will run fine... worst case would be some wear on that lobe and its rocker so you would need to adjust clearance fairly soon and see if it keeps getting wider. It is not going to self destruct or cause expensive damage anywhere else.
For a race bike I would be much less inclined to use that... but I would install new or hardfaced rockers with a "new" cam as well.

Offline 754

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Re: Yoshimura Cam help
« Reply #24 on: September 05, 2017, 09:41:55 am »
I agree , but I think it's a journal, even less to worry about. I would not fill the pit.
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

 

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