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A 10 Piston differences #721046
01/04/18 2:24 pm
01/04/18 2:24 pm
Joined: Jan 2009
Posts: 440
Germany North
expresidente Online content OP
BritBike Forum member
expresidente  Online Content OP
BritBike Forum member
Joined: Jan 2009
Posts: 440
Germany North
Hy
Looks like i have to get some new Pistons for my "Dark Star". Got two offers for new old stock ones. They are both + 0,40 for Super Rocket, one with number 67-1605 the other is 67-1606.
What is the difference; maybe compression ratio? The seller dont know...
so, who can enlighten me?
thanks in advance
Dieter

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Re: A 10 Piston differences [Re: expresidente] #721078
01/04/18 5:01 pm
01/04/18 5:01 pm
Joined: Nov 2009
Posts: 244
UK
V
VicCyclone Offline
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VicCyclone  Offline
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V
Joined: Nov 2009
Posts: 244
UK
More than likely they are the same piston The number stamped on the piston should be 67-1606 which is the part number of the bare +40 piston casting. 67-1605 should be the part number of the complete +40 piston with rings, pin etc. This number is usually not stamped on the piston but is printed on the box or a label. However these numbers were hand stamped at the factory so who knows. If they look the same and measure the same, then they probably are the same. I've got an odd A50 piston somewhere with the wrong number stamped on it.


VicCyclone

1965 A50 Cyclone Clubman
1966 Victor GP
1967 Victor Special
1968 Victor Special
1968 A65L

2009 HD FXDC

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