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friday
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new zealand
Joined: 09/11/2016
Posts: 9

Hi guys , Ive been reading Duane Aushermans site about defective pistons etc and early vs late cylinders.

can anyone tell me how to identify the differences for these early cylinders ?
spigot diameter and sleeve length etc

Ive done a forum search that only mentions 1976 spigot change from 97mm to 99mm , different animal .
TIA cheers

Daves79x
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VBMWMO #9030
Joined: 08/09/2015
Posts: 326
As Mounted on Bike

As mounted on the bike, the early cylinders are 'sculpted' on the bottom edge where they meet the crankcase. They have a projection where the oil return tube runs. The late cylinders are straight across the bottom. That's the only difference I know of. The early style to late style change seems to have occurred about the same time the right side oil hole was drilled from the factory.

Dave

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Dave

friday
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new zealand
Joined: 09/11/2016
Posts: 9
alrighty thanks, so thatd be

alrighty thanks,
so thatd be 1960 change . I know of a frame and cases for sale with no forks here in NZ . theres some cylinders on ebay that are from seized motor so Im only guessing they are the early LH oiled motor pre 1960 .
the cylinder spigot would be less than 97mm diameter wouldnt it ? cheers

schrader7032
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VBMWMO #7032
San Antonio, TX
Joined: 10/27/2006
Posts: 6666
I'm not sure I've heard what

I'm not sure I've heard what the spigot size is for the /2 cases. I know of no changes in that dimension throughout the run of the /2s. The 97 and 99mm I believe you're referring to are about the change in the middle of the /6 series, going from the '75 to the '76 model. I don't think that applies here.

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Kurt in S.A.
'78 R100/7 '69 R69S '52 R25/2

waldoverkill
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VBMWMO #8020
Joined: 05/23/2011
Posts: 27
Nice to see another Kiwi on

Nice to see another Kiwi on here

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