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Messages - Mr G Weston

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1
Singles / Amal 10TT9 carb
« on: 18 June, 2018, 18:51:10 »
I have a 500 ZB33 A competition engine, with an Amal 10TT9 carb. Runs well but I have noticed that when moving the throttle from shut to accelerate the carb has a flat spot and misses a couple of beats at the same spot each time. has anyone any ideas how to cure this problem. cheers Gray.

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Singles / Re: Valve Clearance ZB 33 A
« on: 08 April, 2018, 20:59:12 »
Hi Julian

Thought you might be interested to see the bike.

3
Singles / Re: Valve Clearance ZB 33 A
« on: 08 April, 2018, 15:03:55 »
Julian,
           You are a star! Thanks for sending me the information. I had set the tappets at .008 and .010 not knowing what cams had been fitted, but the engine sounds too tapperty, so .003 on both should quieten things down a bit. Many thanks Graham 

4
Singles / Re: Valve Clearance ZB 33 A
« on: 08 April, 2018, 09:57:52 »
Hi Julien, Thanks for the most useful information. I was told that since the engine had factory fitted GS barrel, head, valves and 1 3/16 " 10tt9 carb, then the valve clearances and ignition data would be different to a standard iron barrelled B33. Many thanks Graham.

5
Singles / Valve Clearance ZB 33 A
« on: 07 April, 2018, 14:40:32 »
Hoping someone can help me. I have a ZB33A competition engine with a plunger frame which was made in 1950.  My question is what are the correct valve clearance  and ignition timing BTDC figures for this engine?  Since the engine has a factory fitted  B34 all aluminium barrel and head do I set the valve clearances at the standard B33 setting, or do I set them for a Goldstar engine? 

I am told this configuration was only produced by BSA from 1950-1951 does this make my machine a rare model?

Any help would be appreciated.

Graham

6
Singles / Re: ZB33A
« on: 23 January, 2018, 15:11:09 »
Hi Julian,
             Thank you very much for the information you have sent, it is very interesting to read. Regards Graham

7
Singles / ZB33A
« on: 21 January, 2018, 13:41:08 »
Hi, I have a 1950 plunger framed 500 ZB33. Stamped on the crankcase is the following, ZB33A 5785 and it has a frame no- ZB31S.7016. The letter HC is also stamped on the crankcase.
  My question is, what does the A stand for and as the engine has a cast alloy head and 1 3/16 Amal 10TT9 carb, was it used for racing or competition? Also were ZB34 cams, barrel head and carb fitted by BSA before exporting to America in 1950. It was sent to R Child Co, Nutley New Jersey USA.
 Any information regarding the above would be most interesting to me. the bike is used on dry roads and is a joy to ride.
regards Graham

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