Hello,
I had plenty of problems with the old and battered 3249S (same as the 3131S)
of my 409, until it was properly rebuilt by a specialist; I bought a Carter
NOS spring-operated auto choke on eBay and subsequently bought from
other USA dealers the kit to rebuild the Carter. The starting trouble in my
car (for which I pestered fellow users of this Forum too many times...),
however, was not due only to a malfuctioning, badly rebuilt carburettor but
also to a maladjusted distributor; once the distributor was fixed, the car
drove quite well and did never have any more starting/running troubles.
Then I bought a NOS 3131S, that will be checked and installed on my rebuilt
318, then I found another used 3131S. In fact you will find anything that
you will need on eBay and I must recommed the eBay shop of Falcon Sales (
http://stores.ebay.com/Falcon-Sales-e-Store ); they sold me all the parts to
rebuild my 318 (
http://www.stefanopasini.it/Bristol_...ken_engine.htm )
and were quite helpful. I think they might have parts for the 313 as well.
All the best
Stefano
(VERY junior member)