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Classic, Vintage & Veteran For Coventry and Meriden Models. Anything pre-Hinckley goes.

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Old 10-04-2009, 09:04 PM   #1 (permalink)
Grand Prix 250
Main Motorcycle: 1967 T120
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Location: Chicago, IL
Posts: 73
Other Motorcycle: 1966 Ducati Mk3 Diana
Best Carbs For 750 Conversion

I am doing a big bore kit on my t120 and am wondering if I am good with my Amal 930's, or should I spring for a set of 932's? This is a road bike that will not see more then 6000 rpm and usually less.

Thanks in advance,

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Old 10-04-2009, 09:15 PM   #2 (permalink)
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Main Motorcycle: 70 T120R Bonnie
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Location: Columbus, OH!O
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Other Motorcycle: 72 Norton Combat
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according to GPZ. Unless your going full out with Lumpy Cams, big
valves and whatnot. The 930's will do just fine. They will of course
need richer jets.
You have a Sonny Routte or Morgo big bore?
"Thanks to denial, I'm immortal" -Phillip J. Fry
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Old 10-04-2009, 11:31 PM   #3 (permalink)
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Moto Grand Prix
Main Motorcycle: T120RT
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Join Date: Feb 2006
Location: in my house
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Other Motorcycle: T140V,T140D,T140E,T140J
Well for what its worth 1970 650cc T120R came with 930 carbs,
1970 '750' T120RT's came with 930 carbs, 1973 thru 1978 T140V's came with 930 carbs.
Now with that in mind whatyouthink?

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Old 10-05-2009, 12:05 AM   #4 (permalink)
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Supersport 600
Main Motorcycle: 62'DBD34
Join Date: Aug 2009
Location: Queensland Australia
Posts: 157
Other Motorcycle: 1970 Morgo T120
Extra Motorcycle: Classic Sidecar Outfit
My 1970 Morgo Bonny runs 30mm carbs. Unfortunatly they are Amal 930s but they have been re-sleeved so the normal 5mm of slide play has been corrected.

I use 200 mains and run the needles on the highest setting.
The bike gets ridden quite hard and performs very well.
This will vary with fuel, cams etc.

If you look at curves for choke size you will find it's nearly all relative to RPM. If you are racing and spend most of the time around 5500-7500 then 32 or 34mm carbs may be better BUT you will suffer at low RPM. Given the choice i would use 30mm Dellauto's. (I won't consider those ones from the people who brought you 'Pearl Harbour')

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