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#713180 - 10/30/17 9:24 am Spitfire IV with 30mm Carbs ***  
Joined: Apr 2017
Posts: 25
semprini Offline
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semprini  Offline
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Posts: 25
Sheffield UK
I've found that this bike has 9/30 (Wassell) carbs fitted rather than the usual 32mm.

Does anyone have an idea why they should be chosen, presuming it wasn't a mistake, which I doubt. The bike pulls well throughout the range and has good economy.


a
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#713195 - 10/30/17 12:59 pm Re: Spitfire IV with 30mm Carbs [Re: semprini]  
Joined: May 2004
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BSA_WM20 Online content
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BSA_WM20  Online Content
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Sydney Australia
If the owner no longer rides at 120 mph then it will breathe quite happily with a smaller carb, usually be a little more frugal & idle better.


Bike Beesa
Trevor
#713240 - 10/30/17 8:08 pm Re: Spitfire IV with 30mm Carbs [Re: semprini]  
Joined: Oct 2007
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Ignoramus Online content
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Ignoramus  Online Content
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probably starts a bit easier with the smaller carbs as well


"There's the way it ought to be and there's the way it is" (Sgt Barnes)
#713266 - 10/30/17 11:51 pm Re: Spitfire IV with 30mm Carbs [Re: semprini]  
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semprini Offline
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semprini  Offline
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Sheffield UK
Now I've got it set up properly, I agree with both of your replies.


a

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