Recent Posts

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11
Amal, Carburation / Re: Odd running on a closed throttle
« Last post by Swarfcut on Today at 08:07 »
 BSA Service Sheet 216 lists Shooting Star 1" Monobloc as Main Jet 270, with Throttle Valve 376/3 1/2 and Needle Jet 0.1065. Position 3 is suggested for needle clip.

 Another basic check is the fuel level in the float chamber, this is outlined is the carb. section of the Forum. This section contains some of the finer detail of carb assembly and float height so worth a look. Also the float valve position in relation to the carb body is dependent on the thickness  and position of sealing washers. Goes without saying check the pilot jet while you have it in bits and also  the mounting flange face for bow and poor sealing.

 

 Swarfy.
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A7 & A10 Engine / Re: Oil Pressure
« Last post by Colsbeeza on Today at 04:28 »
An update on my experience with oil pressures,
I have completed my engine repair and the GF started second kick last week (my Rt knee is a bit weak). I went for first 5-mile ride yesterday.  It ran beautifully, no noises, no spitting or backfiring, and best of all No Smoke, using IMD pistons. Note all is virtually new with 1.8 thou crankshaft end-float and new big-end shells. I had also ran a cleaning drill through the LH conrod oil hole, which had been partially blocked.
I used Penrite 15W-40 Running-In oil, have a pressure gauge fitted and cartridge oil filter in return line.
Cold start gave 60psi at fast idle. Oil returning well. Warmed up and at 35mph was 30psi - no lugging, less than 1/3 throttle. On arrival home it idled at 10psi. That sounds low but common for low-viscosity oil.
My notes from a couple of years ago indicated that when I used Penrite 15W-40 I got the same oil pressures, suggesting that my rebuild has the same resistances to oil flow and everything is normal.
Back then, I changed to Penrite 20W-60 and got 40psi at 30mph and 45psi at 35mph and 20psi at hot idle.
I will probably change to 20W-60 again at 50 miles running and see how that goes.
This may help somebody.
And Muskrats fork dampers worked a treat!
Col
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Lucas, Electrical, Ignition / Re: Points, does this look right?
« Last post by Minto on Today at 02:35 »
Nice one, I'm hoping it might've sorted a misfire I had before I stripped the engine (not the reason for stripping it). Hopefully find out before the weekend
Jase
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Introductions, Member's Stories & Pictures / Re: MidlandsA10
« Last post by scotty on Today at 02:12 »
 *welcome* Tom

Your in the right place for your A projects.

Look fwd to seeing your adventures.

I’m also from the Midlands.
Born and raised in Lichfield Staffs before running away to join the circus.

S
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Lucas, Electrical, Ignition / Re: Points, does this look right?
« Last post by TimK on Today at 02:10 »
The GF refused to start last weekend so I pulled the plugs and there was bugger all spark. After checking the blindingly obvious I remembered this thread and checked whether the points spring was touching the cam. It was, so I pulled the points off and adjusted the spring - Result!

Being able to use the wisdom and experience of everyone on this forum has saved me so much effort and wasted time it's worth my computers weight in gold!
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Introductions, Member's Stories & Pictures / Re: MidlandsA10
« Last post by WozzA on Today at 01:37 »
I can see a get together on the horizon..  *smiley4*
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Clutch, Primary, Gearbox / Re: Primary Chain/Sprocket Wear
« Last post by BagONails on Today at 00:27 »
While at it, a SRM sprocket nut is a worthwhile upgrade to prevent oil seeping out via the mainshaft/final drive gear

Good idea Morris, and there's me thinking it was a design feature to keep the final drive chain lubricated.  ;)
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Clutch, Primary, Gearbox / Re: Primary Chain/Sprocket Wear
« Last post by chaterlea25 on 15.06. 2021 23:03 »
Hi Ian,
Here is the link to my repair for the kickstart stop, similar to Berger's but all in one piece
The thread size is increased to 3/8in.
Hard to believe I posted this back in 2010 *eek*

https://www.a7a10.net/forum/index.php?topic=2914.msg19637#msg19637

John
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Wanted & For Sale / 1948 A7 for sale
« Last post by Tomcat on 15.06. 2021 23:01 »
1948 A7 in good condition, going and registered. Long term owner and everything reconditioned or repaired (with receipts) after first bought. Cosmetics need attention or ride as is. The carby sticks sometimes so will need a new slide. Included in the sale is a large amount of parts collected over 18 years. $10,000
Also available for sale is a 1974 850 Commando, rebuilt with receipts, going, good original cosmetics but needs an exhaust thread repair. $12,000
Located in the Yarra Valley Victoria AU
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Amal, Carburation / Re: Odd running on a closed throttle
« Last post by BSA500 on 15.06. 2021 21:19 »
Well back to how it was and one plug seems to have failed. Strange thing it was nearly white??
Tried with spares and seems to not like slow running and spitting, didn't do that before FFS
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