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31
Wanted & For Sale / Re: Wanted: A7 Pistons & Rings
« Last post by limeyrob on 27.03. 2024 08:14 »
Any use?

http://www.klempfsbritishparts.com/PISTON--A7-BSA--020-0

Post from the USA is quite cheap, can be less than UK domestic but its very size and weight dependent. Its worth calling them if these are right.
32
Wanted & For Sale / Wanted: A7 Pistons & Rings
« Last post by Biker Chris on 27.03. 2024 07:32 »
Greetings all,

During my Star Twin rebuild I find myself in need of the following, if anyone can help, please?

- piston rings +020 (Hepolite R3630/20 or BSA 67-88)
- pistons +020  (Hepolite 10030/20 or BSA 67-84)
Or high compression alternatives +020 (Hepolite 12502/20 or BSA 67-106/67-106)

I've seemingly scoured everywhere, including a few auto jumbles without much success.

It seems both high compression and 020 oversize parts are fairly allusive.

Any help would be great!
33
Gearbox, Clutch, Primary / Re: Clutch Adapter Differences
« Last post by mikeb on 27.03. 2024 01:51 »
Bergs are you aware there are TWO different 42-3170A adaptors, one for fitting a 4-spring to a plunger (larger taper diameter for moving basket inboard) and the other for fitting to an alternator b31/b33 (and maybe later goldie) - which has a narrower taper and moves the basket out. then the standard 42-3170 for standard swing arms which came with 4-springs.
Whether you got it from feked or whoever, it may well have been made by LF Harris and fit for its intended purpose.
Have a look at this thread for more info: https://www.a7a10.net/forum/index.php?topic=18402 inlcuding some measurements.

also keep in mind the different cush drive inners (across different models) can mismatch the alignment. theres a thread on that somewhere.
and if faced with this again I'd consider spacing out or machining down the inner face of the cush drive inner rather than figthing the adaptors internal taper - grinding it is posisble but not easy.
34
Wanted & For Sale / Re: Wanted Crinkle rear hub.
« Last post by Rex on 26.03. 2024 22:28 »
Pretty sure they do. It's the earlier type I need, the later Starfire etc type have the threaded ring for the speedo drive I believe.
Can you PM me a price please Bergs?
35
The past 2 weeks I've been struggling to start a Matchless single. I got it part built with a rebuilt engine that looks to have been standing and got rather dry. I've not been able to get a good swing on the kickstart as the engine is too stiff. I also wanted to prime the oil and cylinder, but as its not road registered and we are in a town centre, I couldn't push it up and down the road.
So I bought a 12v paddock starter off the web.  It is not especially well made and needed fettleing to get it to work, but its been a revelation.  I was able to motor the engine with the plug out for a good few minutes and get oil return and free things up a bit.  Then I was able to start it.  After half a dozen roller starts and about 45 mins running the engine is now free and starts on the kickstart.  I don't think I could have got to that stage on my own and my options were to buy a starter or trailer the bike to the local bike mechanics.  Since the A10 engine will be built soon and needing the same priming I opted to buy the starter. And as we all know; never pass up any reason to buy more tools!
All in its about £540 with the battery and to be honest you could make one for £100 once you see what's in one - not much. I'm quite tempted to make one and flog this one! 
If you are considering one my advice is make one if you have time, they are over priced, but they do the job.  This one will have paid for itself in getting these two rebuilt engines free and running.  I can also use it to pump out the sumps before a run.
36
Wanted & For Sale / Re: Wanted Crinkle rear hub.
« Last post by berger on 26.03. 2024 18:59 »
do these hubs have threads each end ? if so i have one
37
A7 & A10 Engine / Re: 1962 A10 GF commissioning
« Last post by Triton Thrasher on 26.03. 2024 14:15 »
There is more or less always a pool of oil in the bottom of the crankcase of a parked BSA.

Kicking or pushing the bike until oil appears in the tank return, only shows that the scavenge system is working, and has sucked oil from that pool.

I’d be more reassured by seeing some evidence that the feed side of the pump works and is sending oil to the crankshaft.  How about removing the pressure relief valve and looking into the cavity, while the engine is turned over a few times?

38
A7 & A10 Engine / Re: 1962 A10 GF commissioning
« Last post by KiwiGF on 26.03. 2024 10:14 »
Probably give you very sore legs and back if you push it that far!
10 secs of engine ticking-over would probably equal half a mile of heavy bike pushing.. ;)

Its a better method than kicking it over, about 50m was enough to get the oil flowing on mine.
39
A7 & A10 Engine / Re: Cam gear cork
« Last post by muskrat on 26.03. 2024 09:45 »
G'day Nic.
Replace it.
I like to give the corks 5 to 10 thou crush between the cork and inner cover. I have in the past placed a gasket behind the cork to give it more crush but beware too much crush will wear the inner cover.
CheeserBeezer has the in a 4 pack.
Breather cork set,  4 corks
PMG018
67-0134/5/6/7
67-0158/9/60
5.00
Cheers

40
Wanted & For Sale / Wanted Crinkle rear hub.
« Last post by Rex on 26.03. 2024 09:14 »
As the title says, I need a '51 plunger Crinkle rear hub if anyone has one for sale.
Thanks
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