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Author Topic: CB750: What motor oil to use?  (Read 10232 times)

Offline BArTY

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Re: CB750: What motor oil to use?
« Reply #10 on: Sep 27, 2012, 15:51:33 »
Crazypj, do you notice any issues with clutch slippage using Rotella T Triple? I'm doing an oil change this weekend and think I might switch over. Is adding ZDDP necessary or more of a precaution? Should I be adding ZDDP to any oil I use? Thanks guys!
My bike doesn't leak, it marks it's territory.

Offline crazypj

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Re: CB750: What motor oil to use?
« Reply #11 on: Sep 27, 2012, 19:32:47 »
I've had some clutch slip on 378 motors, but, I think they would slip even with conventional oil.
I have used Rotella without ZDDP, it may be just an added precaution but my Katana seems to notice the difference
'you can take my word for it or argue until you find out I'm right'
I gave my girlfriend an orgasm the other night, but, she spat it back at me
 Some humans would do anything to see if it was possible to do it. If you put a large switch in some cave somewhere, with a sign on it saying 'End-of-the-World Switch. PLEASE DO NOT TOUCH', the paint wouldn't even have time to dry
 It’s not worth doing something unless someone, somewhere, would much rather you weren’t doing it  (Terry Pratchett)
CB360's,  http://www.dotheton.com/forum/index.php?topic=11736.0
XS650,  http://www.dotheton.com/forum/index.php?topic=11922.0

Offline djelliott

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Re: CB750: What motor oil to use?
« Reply #12 on: Sep 27, 2012, 20:16:45 »
I haven't noticed on the 350 (bored out from 325 to 358ish) but I did replace the friction disks and alloys with Barrnett parts.
71 CL350 Cafe build thread.
http://dotheton.com/index.php?topic=13543.0

Vitnage Motorcycle Podcast at http://www.clevelandmoto.blogspot.com

Offline crazypj

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Re: CB750: What motor oil to use?
« Reply #13 on: Sep 27, 2012, 21:24:54 »
Barnett are pretty 'grabby' and slightly thicker than stock so will have slightly more spring pressure.
I use stock plates and heavy duty springs.
In my experience, ALL  70's Honda clutches slip at high rpm
'you can take my word for it or argue until you find out I'm right'
I gave my girlfriend an orgasm the other night, but, she spat it back at me
 Some humans would do anything to see if it was possible to do it. If you put a large switch in some cave somewhere, with a sign on it saying 'End-of-the-World Switch. PLEASE DO NOT TOUCH', the paint wouldn't even have time to dry
 It’s not worth doing something unless someone, somewhere, would much rather you weren’t doing it  (Terry Pratchett)
CB360's,  http://www.dotheton.com/forum/index.php?topic=11736.0
XS650,  http://www.dotheton.com/forum/index.php?topic=11922.0

Offline b.flash

  • Posts: 9
Re: CB750: What motor oil to use?
« Reply #14 on: May 12, 2015, 20:36:27 »
I have used Castrol 10-40 for over 40 years in all my bikes.
(And I am a Amsoil dealer, and still use Castrol 10-40)
Non-synthetic? So is that the consensus? 10/40 conventional motor oil is best.
(I take it synthetic causes clutch issues?)
1979 CB 750F

Offline b.flash

  • Posts: 9
1979 CB 750F

Offline jpmobius

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Re: CB750: What motor oil to use?
« Reply #16 on: May 12, 2015, 23:09:20 »
Rotella.  (NOT synthetic) I don't use any sort of additional additives.  Viscosity to suit your climate.  Take enough engines apart that have familiar oil history and you will be a believer.  A couple of years ago I put some in the trans of a two stroke when I didn't have anything else on hand.  Made an absolutely noticeable difference for the better!  That bike didn't have any trans issues before, or so I thought - super surprised at the improvement. No effect on the clutch detected.  Use it universally now.
« Last Edit: May 12, 2015, 23:12:18 by jpmobius »
Mobius


On a long enough timeline, the survival rate for everyone drops to zero.

1973 RD350 Yamaha build  http://www.dotheton.com/forum/index.php?topic=66498.0

Offline Tune-A-Fish©

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Re: CB750: What motor oil to use?
« Reply #17 on: May 12, 2015, 23:12:00 »
Valvoline 10/40 is my choice for basic oil and if fresh build old inline 4 I use Yamalube 10/40
"I didn't come here and I ain't leavin"  Willie Nelson

"love hard, live fast, die fun" Kacey Musgraves

"Like a Wreckin Ball!" Eric Church

Offline crazypj

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Re: CB750: What motor oil to use?
« Reply #18 on: May 13, 2015, 02:44:25 »
and for further reading:
http://classiccars.about.com/od/maintenancetips/a/Zddp-Debunking-The-Urban-Legend-This-Motor-Oil-Additive.htm

 ZDDP has been reduced to about 1200ppm in most oils
From what I've been able to find out, optimum is around 17~1800ppm, higher concentrations can lead to excess wear and corrosion (2200+ppm)
As I'm not a chemist, I add 2oz instead of 4oz so clutch keeps working  8)
'you can take my word for it or argue until you find out I'm right'
I gave my girlfriend an orgasm the other night, but, she spat it back at me
 Some humans would do anything to see if it was possible to do it. If you put a large switch in some cave somewhere, with a sign on it saying 'End-of-the-World Switch. PLEASE DO NOT TOUCH', the paint wouldn't even have time to dry
 It’s not worth doing something unless someone, somewhere, would much rather you weren’t doing it  (Terry Pratchett)
CB360's,  http://www.dotheton.com/forum/index.php?topic=11736.0
XS650,  http://www.dotheton.com/forum/index.php?topic=11922.0

Offline The Jimbonaut

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Re: CB750: What motor oil to use?
« Reply #19 on: Sep 25, 2017, 15:38:18 »
I'm having a few clutch issues and think it might be down to a heavier oil I used (20W 50).  I found this Rotella T Triple oil in Canadian Tire -

http://www.canadiantire.ca/en/pdp/rotella-t-15w-40-diesel-motor-oil-946-ml-0287929p.html#srp

- but it's listed as a diesel engine oil.  Is that gonna work?
"I'm telling you Donnie, nuthin' but nuthin' but right"