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Reply to "Chesil Speedster - my planned winter overhaul of '98 build"

Gentlemen, many thanks for all your answers. Much appreciated as always. Given the state the current fuelling is in, there are so many things I need to do just to get back to a good basic setup (service the carbs, new gaskets, widening the gap in the 911-style shroud to remove any chance of air leaks etc), that I'll do all of that before I start on differing jet sizes etc.

I've disassembled the carb fully and cleaned it today - OMG!

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I presume this gelatinous gunk is old fuel sitting and 'reducing' like a good jus..One of the problems of more ethanol in our fuel?

I'll be sending off for a full gasket/O-ring service kit but the question about jet sizes above was because Dellorto UK offer the same service kit with two differing (new) jet sizes. In looking more closely today whilst cleaning everything, I find my Dellorto DRLA 40 actually has chokes/venturis sized 34. And the main jets which had 175 stamped on the long top part of the screw actually had 145 jets inserted in the bottom:

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So it all looks a little more reasonable. I'm learning on the job, here, so it's all fun. At least the dirt and gunk everywhere explains why the car would only run roughly on idle jets and as soon as I hit 3k revs the car would misfire and lose power like fuel starvation. I'm looking forward to getting this all

However, there will be an extra expense of new floats - one is split so I might as well replace both (they're around £46/$63 each over here).

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The service kit is £122/$161 for dual carbs:

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Total cost (including manifold gaskets) - £219/$300. Not cheap, but this should see the carbs sorted for the next decade. I'm guessing nothing has been changed on this for 20 years.

On another topic, the rocker cover gaskets and flange seals arrived today so I'll fit them tomorrow.

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