Author Topic: 1945 C10 274 to 375 carb swop  (Read 210 times)

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Offline Jarch

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1945 C10 274 to 375 carb swop
« on: February 09, 2019, 07:55:09 pm »
Anyone know the correct Jet, needle jet and slide settings to run a 375 on a 1945 C10.

Old 274 carb is very warn and having given it a full service and many hours have decided to upgrade with some modern technology.

 I have sourced a really good 375 but will not rev over halfway and pops with 100 main jet.

Once again thanks in advance!

Offline Owen

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Re: 1945 C10 274 to 375 carb swop
« Reply #1 on: February 09, 2019, 08:06:37 pm »
Try the same settings as a C10L on the link https://bsac10c11c12.co.uk/smf/carburettor/carburetor-data/
« Last Edit: February 10, 2019, 01:49:18 pm by Owen »
1940 C12 (350cc)
1945 C10 & C11
1953 C10 & C11
Anyone want a B20 in need of a lot of tlc

Online timsdad

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Re: 1945 C10 274 to 375 carb swop
« Reply #2 on: February 10, 2019, 09:33:27 am »
I, personally, would use all those 375 settings for the C10L but go up two sizes on the main jet to a 140 to start with because of our modern unleaded fuel. If it's a bit rich at the very top end, then come down one size and then another if needed. The main jet size, as you probably know, only affects the very top end of throttle openings - sort of over forty miles an hour on a C10 with prevailing winds!

A main jet too small can do damage but a jet too large will never hurt anything at all.


Ray

Just a motorcyclist.

Offline Jarch

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Re: 1945 C10 274 to 375 carb swop
« Reply #3 on: February 10, 2019, 01:04:08 pm »
Thanks Ray will definitely try 140