Author Topic: New rebuild 1963 A10  (Read 3315 times)

Offline magicflem

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Re: New rebuild 1963 A10
« Reply #30 on: 13.08. 2014 00:10 »
Don,
If I am using STD sized 9:1 JP Pistons I am now wondering if 0.005" piston to bore clearance is too little.
Regards,
Kim
1930 BSA B30-3 Side Valve Girder (being restored)
1955 BSA A10 Road Rocket
1955 BSA A10 Golden Flash
1956 BSA A10 Road Rocket
1951 BSA A10 Golden Flash
1956 BSA DB32 Gold Star Clubman
1958 BSA A10 Super Rocket
1961 BSA C15 (being restored)
1961 BSA C15 Star "America" (being restored)
1961 BSA A10 "Big Valve" Super Rocket (being restored)
1963 BSA A10 Rocket Gold Star

Online fringedweller

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Re: New rebuild 1963 A10
« Reply #31 on: 13.08. 2014 01:34 »
JP recommend 5thou unless running a sidecar, which requires a little more clearance.
I'm running 8:1 comp in the Super Rocket, plenty of power and smooth.
Crank , mains etc rebuilt by Martyn Adams of MDA eng, another South Oz company.
Some people say he is expensive , but it stays fixed.
Don

Offline magicflem

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Re: New rebuild 1963 A10
« Reply #32 on: 14.08. 2014 09:40 »
Would it hurt to go 0.006 or 0.007thou?
1930 BSA B30-3 Side Valve Girder (being restored)
1955 BSA A10 Road Rocket
1955 BSA A10 Golden Flash
1956 BSA A10 Road Rocket
1951 BSA A10 Golden Flash
1956 BSA DB32 Gold Star Clubman
1958 BSA A10 Super Rocket
1961 BSA C15 (being restored)
1961 BSA C15 Star "America" (being restored)
1961 BSA A10 "Big Valve" Super Rocket (being restored)
1963 BSA A10 Rocket Gold Star

Offline BSA_54A10

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Re: New rebuild 1963 A10
« Reply #33 on: 14.08. 2014 20:16 »
Going out another thou is basically "wearing" the bore.
It won't greatly affect the engine other than reducing the life of this bore.
I have never had a problem with JP pistons only the rings he fits to them which I never use.
Bike Beesa
Trevor

Online muskrat

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Re: New rebuild 1963 A10
« Reply #34 on: 14.08. 2014 21:19 »
My rule of thumb is for road use 4 and track (racing) is 6 using cast pistons. Forged pistons require a thou or two more.
Cheers
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
Australia
Muskys Plunger A7

Online trevinoz

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Re: New rebuild 1963 A10
« Reply #35 on: 14.08. 2014 22:19 »
Kim, are there any signs that the pistons picked up the sleeve? Such as sieze marks.
I have had good results with GPM pistons in 2 Rocket engines and a Norton Atlas as have some of my mates.
There are some here who have not.
In my low compression engines, 7.25:, I have used pistons which came in a plain unbranded box, probably Taiwanese, but looked good and so far are performing well.
As to JP, I recently did some work on an A65 which has new JP pistons fitted. They looked very good compared to the old production heavy things of the past and I suppose that I am prejudiced against the new ones.
The rings don't seem to be up to the job as the engine seemed too smokey to me, maybe time and a few miles will improve it

Trev.

Offline magicflem

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Re: New rebuild 1963 A10
« Reply #36 on: 15.08. 2014 02:53 »
This is one of the JP pistons
1930 BSA B30-3 Side Valve Girder (being restored)
1955 BSA A10 Road Rocket
1955 BSA A10 Golden Flash
1956 BSA A10 Road Rocket
1951 BSA A10 Golden Flash
1956 BSA DB32 Gold Star Clubman
1958 BSA A10 Super Rocket
1961 BSA C15 (being restored)
1961 BSA C15 Star "America" (being restored)
1961 BSA A10 "Big Valve" Super Rocket (being restored)
1963 BSA A10 Rocket Gold Star

Offline magicflem

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Re: New rebuild 1963 A10
« Reply #37 on: 15.08. 2014 08:47 »
Can I ask what rings you suggest please  BSA_54A10?
Regards,
Kim
1930 BSA B30-3 Side Valve Girder (being restored)
1955 BSA A10 Road Rocket
1955 BSA A10 Golden Flash
1956 BSA A10 Road Rocket
1951 BSA A10 Golden Flash
1956 BSA DB32 Gold Star Clubman
1958 BSA A10 Super Rocket
1961 BSA C15 (being restored)
1961 BSA C15 Star "America" (being restored)
1961 BSA A10 "Big Valve" Super Rocket (being restored)
1963 BSA A10 Rocket Gold Star

Online trevinoz

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Re: New rebuild 1963 A10
« Reply #38 on: 16.08. 2014 00:16 »
Little bit of a "grab" there, Kim.

Online Brian

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Re: New rebuild 1963 A10
« Reply #39 on: 22.08. 2014 06:20 »
As the subject of liners was discussed here I thought I would add a bit more.

I knew I had some A10 liners but it has taken me a couple of weeks to find them, I really must have a clean out oneday.

Anyway here are some pics of genuine Hepolite liners for a A10 plus a scan of the fitting instructions. You will see they are parrallel (no step at top) but they do have the relieved section at the bottom that John (Chaterlea25) referred to.

Offline WozzA

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Re: New rebuild 1963 A10
« Reply #40 on: 22.08. 2014 07:28 »
Kabana only $1 each....  you've had that tucked away for awhile...  *eek*
'51 Golden Flash Plunger
'57 Golden Flash Swingarm

Melbourne
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Offline magicflem

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Re: New rebuild 1963 A10
« Reply #41 on: 22.08. 2014 07:36 »
WozzA,
Have I missed something: "Kabana"? "$1.00 each"?
Kim
1930 BSA B30-3 Side Valve Girder (being restored)
1955 BSA A10 Road Rocket
1955 BSA A10 Golden Flash
1956 BSA A10 Road Rocket
1951 BSA A10 Golden Flash
1956 BSA DB32 Gold Star Clubman
1958 BSA A10 Super Rocket
1961 BSA C15 (being restored)
1961 BSA C15 Star "America" (being restored)
1961 BSA A10 "Big Valve" Super Rocket (being restored)
1963 BSA A10 Rocket Gold Star

Offline duTch

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Re: New rebuild 1963 A10
« Reply #42 on: 22.08. 2014 07:59 »

 
Quote
Have I missed something: "Kabana"? "$1.00 each"?
Maybe just a decade or two..... *smile*

 But at least it says '$', not  '£'......!
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
Australia

Offline magicflem

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Re: New rebuild 1963 A10
« Reply #43 on: 22.08. 2014 08:19 »
Ahhhhh.....
Must be showing my age - I don't read newspapers, everything is online for me!!
Sorry guys.
Kim
1930 BSA B30-3 Side Valve Girder (being restored)
1955 BSA A10 Road Rocket
1955 BSA A10 Golden Flash
1956 BSA A10 Road Rocket
1951 BSA A10 Golden Flash
1956 BSA DB32 Gold Star Clubman
1958 BSA A10 Super Rocket
1961 BSA C15 (being restored)
1961 BSA C15 Star "America" (being restored)
1961 BSA A10 "Big Valve" Super Rocket (being restored)
1963 BSA A10 Rocket Gold Star

Offline magicflem

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Re: New rebuild 1963 A10
« Reply #44 on: 29.08. 2014 03:08 »
OK.
Since we last spoke I have been busy locating another barrel that has not been sleeved. Bingo, found one and now I have decided to also buy new pistons (+60thou 8.25:1 GPM's).
The new barrel and associated bibs and bobs are with my new engineer being treated to a bit of a bore and a bit of a hone.
Now, for my next question - how do I ensure that when running in I do not overheat the engine and nip up a piston. Is it a matter of raising the needle a notch or not overreving etc..... help, I need advice!!
Regards,
Kim   
1930 BSA B30-3 Side Valve Girder (being restored)
1955 BSA A10 Road Rocket
1955 BSA A10 Golden Flash
1956 BSA A10 Road Rocket
1951 BSA A10 Golden Flash
1956 BSA DB32 Gold Star Clubman
1958 BSA A10 Super Rocket
1961 BSA C15 (being restored)
1961 BSA C15 Star "America" (being restored)
1961 BSA A10 "Big Valve" Super Rocket (being restored)
1963 BSA A10 Rocket Gold Star