Is my CA77 Dream running an over bore motor?

[black55tbird]

I just removed the head and cylinder on my 1964 Dream and measured the bore with a caliper and it is just under 63 cm.... and I expected to see just over 60 cm. One of the pistons is marked on the side with CB77.
I don't know much about cylinders etc but these look a little thin to me.

Anyone have any clue to what have going on here?

[LOUD MOUSE]

What numbers are on the top of the piston?. .....lm

I just removed the head and cylinder on my 1964 Dream and measured the bore with a caliper and it is just under 63 cm.... and I expected to see just over 60 cm. One of the pistons is marked on the side with CB77.
I don't know much about cylinders etc but these look a little thin to me.

Anyone have any clue to what have going on here?

[black55tbird]

Pistons say Japan 3.00 on the tops. That's all I can find.

[Hoosier Tom]

You've got a 63mm big bore kit installed some time in the past, so yes, your liners would look a little thin. 4th over on a 305 is 61mm.

HT

[black55tbird]

Interesting. So since I need to freshen it up with new pistons and rings what, if anything can I do? One cylinder has a little wear so I will need to bore this out. Can I go a little larger with these cylinders? Are there any pistons and rings to fit?

Thanks, Craig

[G-Man]

Might be simpler to get a replacement barrel or liners. You then have a lot of options to work with.

G

[malcolmgb]

Might be simpler to get a replacement barrel or liners. You then have a lot of options to work with.

G

Graham is it possible to get liners in the UK I may be in a similar position.