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Author Topic: Big bore sleeve OD, standard size? Old sleeves to be replaced by new  (Read 3090 times)

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Offline PeWe

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Big bore sleeve OD, standard size? Old sleeves to be replaced by new
« on: February 12, 2016, 12:14:14 pm »
- Are the outer diameter of big bore sleeves made according to a standard?
I have an old cylinder with a very old Henry Abe 900cc Big bore kit with tapered sleeves, no need of case bore. Probably from early 70's.

I intend to replace the sleeves with new, also tapered and 67mm pistons, Dynoman 890 kit. Can I be sure that new sleeves will fit? They might be just too small, right?  (Tight crimp fit for perfect  heat transportation to cylinder.)

- Possible to measure when fitted?
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CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline BPellerine

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Re: Big bore sleeve OD, standard size? Old sleeves to be replaced by new
« Reply #1 on: February 12, 2016, 12:30:27 pm »
I can measure my nos ha sleeves for you pewe.give me a little time,then get od of the sleeves you want.billp
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Offline Jerry Rxman Griffin aka MuthaF'er

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Re: Big bore sleeve OD, standard size? Old sleeves to be replaced by new
« Reply #2 on: February 12, 2016, 12:41:12 pm »
I also have 2 spare 900 size sleeves I picked up from CycleX I can check for you. Don't think they have the taper but I have not looked at them in a long time.
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Offline BPellerine

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Re: Big bore sleeve OD, standard size? Old sleeves to be replaced by new
« Reply #3 on: February 12, 2016, 04:11:57 pm »
Quote from: BPellerine on February 12, 2016, 12:30:27 pm
I can measure my nos ha sleeves for you pewe.give me a little time,then get od of the sleeves you want.billp
my nos henry abe liners measure 74.25 od.
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Offline Retro Rocket

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Re: Big bore sleeve OD, standard size? Old sleeves to be replaced by new
« Reply #4 on: February 12, 2016, 11:02:08 pm »
I have an MTC 900 kit i'm about to use, it came with sleeves as well, haven't measured them yet...
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Offline mick7504

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Re: Big bore sleeve OD, standard size? Old sleeves to be replaced by new
« Reply #5 on: February 13, 2016, 12:41:39 am »
This might be some useless information, however, these are the specs on the LA Sleeves.
These aren't precision measurements but will be ok for comparison.
Ken at Cyclex gave me 3 of these years ago and LA Sleeve supplied the 4th one.
No case boring is required with these.










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Offline PeWe

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Re: Big bore sleeve OD, standard size? Old sleeves to be replaced by new
« Reply #6 on: February 13, 2016, 02:39:03 am »
Thank you very much guys!
I'm not really sure which bore I'll go for.  890 with tapered sleeves make it easier to fit, no need of case boring. Possible to rebore and fit 67.5mm pistons.
The cases will be taken apart anyway (Ultra crank going in) so case bore is not a huge extra. Will 915 or 970 give much extra power compared with 890?

The HA sleeves are most likely as Bill measured 74.25mm. CycleX tapered sleeves are 74mm. Dynomans might be same. I must go bigger if using the old 900 cylinder. Bigger is 74.5mm...
The tuning domino effect strikes again!
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CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline Jerry Rxman Griffin aka MuthaF'er

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Re: Big bore sleeve OD, standard size? Old sleeves to be replaced by new
« Reply #7 on: February 13, 2016, 09:02:02 am »
OK, quick measurement. The 2 that I got from Kenny ARE tapered. 70mm OD at the taper. 73mm OD under the lip (slight recess). 74.2mm OD center. 64mm ID. Thickness 5mm. Disclaimer: Cheap caliper. No markings.
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Offline 754

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Re: Big bore sleeve OD, standard size? Old sleeves to be replaced by new
« Reply #8 on: February 13, 2016, 01:37:26 pm »
Not tapered on the end , they are stepped...
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Offline BPellerine

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Re: Big bore sleeve OD, standard size? Old sleeves to be replaced by new
« Reply #9 on: February 13, 2016, 02:30:34 pm »
Quote from: 754 on February 13, 2016, 01:37:26 pm
Not tapered on the end , they are stepped...
would that have been cast in,or machined after?bill
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Offline Jerry Rxman Griffin aka MuthaF'er

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Re: Big bore sleeve OD, standard size? Old sleeves to be replaced by new
« Reply #10 on: February 13, 2016, 08:23:25 pm »
Quote from: 754 on February 13, 2016, 01:37:26 pm
Not tapered on the end , they are stepped...

OK Frank, whatever  ::) didn't realize you were so technical  ;)

They are cast that way Bill
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As of today 3/13/2012 my original owner 75 CB750F has made it through 3 wives, er EX-wives. Free at last.  ;-)

Offline PeWe

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Re: Big bore sleeve OD, standard size? Old sleeves to be replaced by new
« Reply #11 on: February 14, 2016, 02:51:59 am »
The sellers write "tapered" :) CycleX, Dynoman.

I measured the gap between the under slimmer part of sleeves today. 1.5mm drill could be pressed in. 2mm was way too big.
This means that the hole in cylinder diam is 73mm on this side. 70+(1.5x2)=73mm
Like Jerry's... If the cylinder is bored in steps to fit the sleeves
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Quote from: Jerry Rxman Griffin aka MuthaF'er on February 13, 2016, 09:02:02 am
OK, quick measurement. The 2 that I got from Kenny ARE tapered. 70mm OD at the taper. 73mm OD under the lip (slight recess). 74.2mm OD center. 64mm ID. Thickness 5mm. Disclaimer: Cheap caliper. No markings.
73mm sleeves with 67/67.5mm inner was made back in the 70's?

It should be easier to remove a sleeve and see. But this will my local tuner do, until theen I need a piston + sleeve kit.
Not too small is the deal for now.
Special installing measures from 70mm pistons (970cc) when bore will make holes between 1-2, 3-4..., right?
915 is the biggest sleeves without any oil leak risk to weld/seal?

CycleX sold 970cc cylinder 2 weeks ago on eBay... pity that I'm planning late.. 11:1 to fit my head would be fine
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CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline MessnerMoto

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Re: Big bore sleeve OD, standard size? Old sleeves to be replaced by new
« Reply #12 on: February 14, 2016, 09:38:59 am »
Little bit of the topic. To what diameter to bore sleeves for wiseco 836 kit?
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Offline PeWe

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Re: Big bore sleeve OD, standard size? Old sleeves to be replaced by new
« Reply #13 on: February 14, 2016, 11:12:53 am »
836 is 65mm.
But it must be correct according to Wiseco spec and piston diameter for correct clearance
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CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline MessnerMoto

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Re: Big bore sleeve OD, standard size? Old sleeves to be replaced by new
« Reply #14 on: February 14, 2016, 11:18:53 am »
I know pistons are 65mm ;) But what clearance is recommended between piston and sleeve? Should I measure each piston with micrometer and bore each sleeve according to those measurements?
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Offline BPellerine

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Re: Big bore sleeve OD, standard size? Old sleeves to be replaced by new
« Reply #15 on: February 14, 2016, 11:32:39 am »
.002 is the clearance spec for weisco 836,big jay has run them tighter,like 15,and you must fit each piston to its bore to account for any variance in diameter.billp
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Offline MessnerMoto

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Re: Big bore sleeve OD, standard size? Old sleeves to be replaced by new
« Reply #16 on: February 14, 2016, 11:51:31 am »
Thanks. OI was looking for that kind of info ;)
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Offline 754

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Re: Big bore sleeve OD, standard size? Old sleeves to be replaced by new
« Reply #17 on: February 14, 2016, 12:24:49 pm »
Do not try to size without pistons.  Usually you leave 2-4 thou for honing, you may he safe boring to .003-.004; under nomnal size.
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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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