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Author Topic: carb measuring  (Read 3284 times)

Offline RGP750

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carb measuring
« on: June 13, 2024, 05:23:59 PM »
HiAll
I'm rebuilding a 1971 cb125 twin and it should have 18 carbs (not literally) I have got my 20 carbs mixed up with them.
I believe the 18 and 20 is the choke size in MM .
where should I be measuring? is it the width through the inlet?
Cheers Rich
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1972 500/4
1973 CB175
1972 CB175
1959 BSA Super rocket
1927 960cc Matchless 'v' twin
1969 750 K0

Offline Johnwebley

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Re: carb measuring
« Reply #1 on: June 13, 2024, 05:35:00 PM »
Normally it's the height,

On the CB200 the venturi is narrow, but the full height,

On the 500,the venturi seems circular,

Hope this helps

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Offline RGP750

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Re: carb measuring
« Reply #2 on: June 13, 2024, 06:32:43 PM »
Thanks John I'll take a look at that.
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1972 500/4
1973 CB175
1972 CB175
1959 BSA Super rocket
1927 960cc Matchless 'v' twin
1969 750 K0
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