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Hondo57
CB1100F
Joined: Jun 20, 2014
Posts: 2380
Location: Grand Rapids, Michigan
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 Posted:
Thu May 14, 2015 1:43 am |
 
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Is a 1981 CB 900F engine case a doughnut case? |
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Greg |
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melchiro
Silver CB900F
Joined: Aug 10, 2003
Posts: 1514
Location: Mill Creek, WA.
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Thu May 14, 2015 3:28 am |
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No..
Donuts are 1982 750-900... And 1983 CB1000C & CB1100F... And 1982-83 CB750SC Nighthawk. |
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1979 Modified CBX
1982 Modified CB-750/1100F
1983 Modified CB-750/1123F Track bike
1980 Modified GS1000GT |
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Mr20v
Twinstar
Joined: Mar 16, 2015
Posts: 67
Location: Sydney, Australia
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Fri May 15, 2015 10:34 am |
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I'd like to take this opportunity to tell you I'm completely lost.
What's a doughnut case? (& does it include sprinkles) |
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Simon_CB900
Black CB750F
Joined: Apr 26, 2014
Posts: 772
Location: Fife, Scotland
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Fri May 15, 2015 5:02 pm |
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| Mr20v wrote: |
I'd like to take this opportunity to tell you I'm completely lost.
What's a doughnut case? (& does it include sprinkles) |
Sprinkles???? Is that an Australian abomination? 
Doughnuts should have jam on the inside and a dusting of castersugar on the outside   |
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Simon.
\'81 CB 750/900 mongrel  |
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sonicrete
Red CB1100F
Joined: Aug 19, 2003
Posts: 15472
Location: Lancaster,Ohio
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Fri May 15, 2015 7:09 pm |
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Just to the outside of where the topend oiling is bolted on. The is a mark in the case of a donut that indicates the heavy duty. |
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headless
CB1100F
Joined: Sep 03, 2008
Posts: 2066
Location: Eugene, OR
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Fri May 15, 2015 7:58 pm |
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Here's a picture that I lifted from JJAM. The donut is to the right (below in the pic) the oil port.
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Cary |
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Hondo57
CB1100F
Joined: Jun 20, 2014
Posts: 2380
Location: Grand Rapids, Michigan
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Sat May 16, 2015 12:14 am |
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Jim said a non doughnut is okay for street mods and for most riders. For racing you need the doughnut case. |
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Greg |
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Bone
Black CB750F
Joined: Oct 20, 2014
Posts: 877
Location: Canberra, Australian Capital Territory, Australia
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Sat May 16, 2015 12:38 am |
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Thanks for the lesson on the nomenclature. I now know I have a doughnut case and a D head |
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1981 CB750F (gone, but not forgotten)
1982 CB900FC
1981 CB900F2B |
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Hondo57
CB1100F
Joined: Jun 20, 2014
Posts: 2380
Location: Grand Rapids, Michigan
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Sat May 16, 2015 1:05 am |
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I wonder if an 81 900F has a D head? |
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Greg |
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headless
CB1100F
Joined: Sep 03, 2008
Posts: 2066
Location: Eugene, OR
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Sat May 16, 2015 1:48 am |
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| Hondo57 wrote: |
| I wonder if an 81 900F has a D head? |
Yes, it does. I have only seen non-D heads on the '80 900c. |
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Cary |
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nugget
Twinstar
Joined: Mar 12, 2014
Posts: 227
Location: new york
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Mon May 18, 2015 2:11 pm |
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what's a d head ?
Thanks Jamie |
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thx113
Friend of the Board
Joined: Apr 23, 2005
Posts: 3522
Location: Western Australia
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Mon May 18, 2015 2:23 pm |
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| nugget wrote: |
what's a d head ?
Thanks Jamie |
Head with a D shaped exhaust port rather than a round one. The centre code will be 461 as in 12010-461-750. This head was first used on the 82 CB900's in Australia.
I also have a set of NOS silver 81 CB900 crankcases that I'm sure are doughnut cases. |
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Running 0.06mm to 0.09mm valve clearances since 1983 and proud of it.
CB750 FB
CB1100FD Super Boldor
VF1000RE x 2
VF1000RF
Black scooter (06 CBR1100XX)
Red scooter (94 VFR750FR)
CT110 Hyper Sport |
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DonR
CB1100F
Joined: Feb 17, 2009
Posts: 2105
Location: Oz
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Mon May 18, 2015 10:31 pm |
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| melchiro wrote: |
No..
Donuts are 1982 750-900... And 1983 CB1000C & CB1100F... And 1982-83 CB750SC Nighthawk. |
My 81 has a donut case. |
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Hondo57
CB1100F
Joined: Jun 20, 2014
Posts: 2380
Location: Grand Rapids, Michigan
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Mon May 18, 2015 10:54 pm |
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Maybe I would be lucky and my 1981 USA is a doughnut case? I am not sure what I am looking for in the pic Cary posted. Can anyone be more specific on where exactly the doughnut is? |
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Greg |
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1100russ
CB1100F
Joined: May 17, 2010
Posts: 2978
Location: williamsburg, ohio
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Mon May 18, 2015 11:01 pm |
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Circled (kinda  ) in red.....
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CB1100F The Hot Rod
CB985F The Track Bike
XR100 Teaching Bike
Suzuki GSF1200 The Mistake
CB900F Who Knows what it\'s going to be |
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Hondo57
CB1100F
Joined: Jun 20, 2014
Posts: 2380
Location: Grand Rapids, Michigan
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Mon May 18, 2015 11:25 pm |
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Thanks Russ, I'll have a look but I don't think I have that:-( |
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Greg |
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1100russ
CB1100F
Joined: May 17, 2010
Posts: 2978
Location: williamsburg, ohio
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Mon May 18, 2015 11:55 pm |
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Just bought a set on ebay for 51 bux delivered! Score! |
_________________
CB1100F The Hot Rod
CB985F The Track Bike
XR100 Teaching Bike
Suzuki GSF1200 The Mistake
CB900F Who Knows what it\'s going to be |
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Hondo57
CB1100F
Joined: Jun 20, 2014
Posts: 2380
Location: Grand Rapids, Michigan
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Tue May 19, 2015 12:34 am |
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Thumbs up! |
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Greg |
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