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Rating: 3
Spitfire IV with 30mm Carbs #713180
10/30/17 9:24 am
10/30/17 9:24 am
Joined: Apr 2017
Posts: 37
Sheffield UK
S
semprini Offline OP
BritBike Forum member
semprini  Offline OP
BritBike Forum member
S
Joined: Apr 2017
Posts: 37
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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Re: Spitfire IV with 30mm Carbs [Re: semprini] #713195
10/30/17 12:59 pm
10/30/17 12:59 pm
Joined: May 2004
Posts: 3,674
Sydney Australia
B
BSA_WM20 Offline
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BSA_WM20  Offline
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B
Joined: May 2004
Posts: 3,674
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
Re: Spitfire IV with 30mm Carbs [Re: semprini] #713240
10/30/17 8:08 pm
10/30/17 8:08 pm
Joined: Oct 2007
Posts: 1,524
Auckland NZ
Ignoramus Offline
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Ignoramus  Offline
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Joined: Oct 2007
Posts: 1,524
Auckland NZ
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)
Re: Spitfire IV with 30mm Carbs [Re: semprini] #713266
10/30/17 11:51 pm
10/30/17 11:51 pm
Joined: Apr 2017
Posts: 37
Sheffield UK
S
semprini Offline OP
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semprini  Offline OP
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S
Joined: Apr 2017
Posts: 37
Sheffield UK
Now I've got it set up properly, I agree with both of your replies.


a

Moderated by  Allan Gill, Jon W. Whitley 


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