6 Comments

1. wesley chow

   Posted April 1, 2010 at 4:31 PM

   hi martin, I have some questions regarding keihins.I have a 72′like yours, it has the
   original 1300cc, I’ve also changed the carb(single stromberg), to twin S.U.’s., then
   opt for PRI Keihins.my question, are you just running the stock fuel pump., and also,
   what are you doing for operating a choke, for those cold mornings ? Thanks’
   Wesley.

2. Martin Aveyard

   Posted April 1, 2010 at 7:23 PM

   Hey Wesley,

   I’ve blocked off the stock fuel pump on the block and run an electric fuel pump mounted in the rear fender. I’ve put a fuel pressure regulator in the engine bay set at 1 psi, as the carbs would have been gravity-fed on a bike.

   I had, at one point, made up a bracket and connected the choke via cable to the stock choke position on the dash, but I was never happy with the operation of it so I’ve removed it and just open the hood to manually open the choke right now. Not an ideal solution, so I’ll probably look at it again, probably with a more flexible cable and a return spring on the choke lever itself.

   Martin

3. Rafael

   Posted June 17, 2014 at 9:34 PM

   Martin.

   I have a 76 Spitfire 1500. I am installing a Keihin CR29. I had the adaptor made. Question. What do you use to support the Carb at the bottom. The carb is somewhat heavy. Also, what do you do with vacuum hoses and Air Pump? Do you still need it?

   Thanks

   Rafael.

4. Rafael

   Posted July 23, 2014 at 10:39 AM

   Martin.

   Thanks for your answer regarding the carb support. Would you happen to know what Kehin’s model you are using. The CR29, CR31 o CR33 for your 1500cc engine? Would it really make a difference which is used? The difference is so little. Let me know.

   Rafael.

5. Garrett

   Posted August 30, 2016 at 6:27 PM

   Martin,
   I am starting on this conversion for my 1980 Spitfire…these pics are great!

   My question is, what kind of Black hose are you using to connect the manifold pipes to the venturis?

   Also, as Rafael asked above, is there any special support or do the manifolds and hoses support everything?

   THANK You!!

6. Martin Aveyard

   Posted May 4, 2017 at 4:38 PM

   The black hoses are just approx 2″ silicone hose and they do all the supporting of the carbs – no support from below required.