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Author Topic: 1955 A7 Barrel  (Read 723 times)

Offline Andrew J

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1955 A7 Barrel
« on: 27.05. 2012 01:38 »
Hi, I am looking for a thin flange big fin barrel for an A7 that is either on standard or +10 as I have a set of original +20 pistons that I want to use.

     I have a barrel that will take +60 but the only pistons that I can find to fit are JP which are 6.6:1 and I wanted to use the 7.25:1 as used originally.

     Would be better if the item was located in Australia as postage from the UK would be quite high I think.

     The other option is if somebody has a set of +60 7.25:1 pistons they would like to sell or swap for a set of +20s.

     This has all come about due to believing what people say on Ebay, I bought a set of barrels that were meant to be on standard, which sat while I         
     collected the other parts I needed and have just taken them to the engineering shop to find out that they need to go out to +60,  quite 
     annoying.
 
     Thanks Andy

 
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Offline KiwiGF

  • Last had an A10 in 1976, in 2011 it was time for my 2nd one. It was the project from HELL (but I learned a lot....)
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Re: 1955 A7 Barrel
« Reply #1 on: 27.05. 2012 06:43 »
The a7 barrel I listed in the wanted section is still available, it's on STD.

I'm not sure what big fin means in respect a7 barrels, I think all thick flange a10 barrels are big fin? And all a7 barrels are thin flange?

But For the record the a7 barrel I have has smaller fins than my thick flange a10 barrel.
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New Zealand

1956 A10 Golden Flash  (1st finished project)
1949 B31 rigid “400cc”  (2nd finished project)
1968 B44 Victor Special (3rd finished project)
2001 GL1800 Goldwing, well, the wife likes it
2009 KTM 990 Adventure, cos it’s 100% nuts

Offline Andrew J

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Re: 1955 A7 Barrel
« Reply #2 on: 27.05. 2012 10:51 »
Hi KiwiGF,

You are right about all A7 barrels having the thin flange, but I require the A7 barrel with the same larger fins as your A10, I am not exactly sure when the A7 changed to the larger fin, but I am sure someone on the forum will let us know.

Thanks for tacking the time to reply.

Regards Andy
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Online orabanda

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Re: 1955 A7 Barrel
« Reply #3 on: 27.05. 2012 11:43 »
Hi Andy,
Why don't you consider having liners fitted to your barrel; then you can use the original pistons.
Richard
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Offline Andrew J

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Re: 1955 A7 Barrel
« Reply #4 on: 28.05. 2012 01:09 »
Hi Richard,

I have considered, and it will cost about $500 but I would be a bit of a waste as I would have to bore the new liner out to +20 and I think the liner will only bore to +40 so if I am not able to find a suitable barrel or pistons  I will go with the lower compression pistons.

I am not sure how much the lower compression 6.6:1 pistons would have rather than the 7.25:1 , anybody have an idea on this.

Regards Andy
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