Author Topic: Custodian of an A10  (Read 1648 times)

Offline duTch

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Re: Custodian of an A10
« Reply #30 on: 30.08. 2019 00:52 »

 
Quote
The correct Imperial size is 25/32.
20mm is Metric.

 weeeell I got the 25 bit right *smile* if I'd have thought it through would've guessed it's bigger than 1/2".....
 
 
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....probably closest Imperial size is ~20mm  *smile*
was (obviously?) just a little  tongue in cheek:P
Started building in about 1977/8 a on average '52 A10 -built from bits 'n pieces never resto intended -maybe 'personalised'
Have a '74 850T Moto Guzzi since '92-best thing I ever bought doesn't need a kickstart 'cos it bump starts sooooooooo(mostly) easy
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Offline roys51a10

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Re: Custodian of an A10
« Reply #31 on: 20.10. 2019 22:56 »
Hi a bit of an update. Most of it is stripped down and just cleaned.The forks needed new seals (one was actually not leaking not bad for nearly 50 years).Converted to taper head bearings replaced wheel bearings and brake shoes. I decided to take the engine apart and check after reading about the sludge trap.Engine looks untouched,std bore, can't find piston part No anywhere to find comp ratio(67-573) also cam is 356 which i don't think is std.There's very little wear in the bearings so hopefully should be able to clean and reassemble.A few pics of so far.
Thanks Grant.
Dads 1951 A10

Online Greybeard

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Re: Custodian of an A10
« Reply #32 on: 20.10. 2019 23:17 »
Standard pistons!
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Offline Swarfcut

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Re: Custodian of an A10
« Reply #33 on: 21.10. 2019 00:00 »
Standard Cam is 67-334 on an early plunger, usually found on engines with the dished low compression pistons. 67-356 is sportier cam, a little more lively, originally found on the A7 Star Twin and then on the A10 S/A higher compression variants. Those flat topped pistons will be OK with that cam. Piston 67-572, standard bore, with oversizes 67-574 and 67-576 are all listed as 8.1. As usual the one you want appears nowhere, but 8.1 would be a reasonable guess, bearing in mind 6.5, 7.25, 9.1 were all options, but obviously with a flat top, 9.1 doesn't figure.

 Interestingly the 67-356  Cam and 8.1 Pistons 67-572 were fitted to the Super Flash.

When you come to re assembly, it is a lot easier to assemble the crank, cases and gearbox as a unit, fit this to the frame and then build the rest of the motor into the frame.

Swarfy.

Offline roys51a10

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Re: Custodian of an A10
« Reply #34 on: 21.10. 2019 00:59 »
Thanks that'll be a lot lighter way of fitting it back in.Quite a struggle getting it out.I have found the std listed as 572 but these are 573 not found anywhere.
Dads 1951 A10

Online JulianS

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Re: Custodian of an A10
« Reply #35 on: 21.10. 2019 09:03 »
67 572 is the part number for the piston complete with rings etc.

67 573 is the part number for the bare piston.