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Mailman,
Jim raises a good point.
I'd also check the fuel filters - modern filters are designed for fuel under pressure from a fuel pump, while yours is a gravity feed system. I'm thinking there's maybe not enough fuel seeping through to keep the revs up. You could take the filters out of line, and run it without them for a while to see if it improves.
Another thing you might check is how the carbs are plumbed. Do you have double banjoes on both carbs, with the main fuel line going to one carb, then a pipe from one carb to the other, then the second one going to the reserve tap on the tank? - a loop if you like. If this is the case, you could open up the reserve while up at 3000 rpm, and see if more fuel flowing (from both main and reserve) helps. If they're not plumbed this way, then please describe how they are.
I don't think it's electrical at this stage.
You could take the plugs out and check their colour. If they're black and sooty, it's most likely the choke Jim mentioned. If they're white, it more likely fuel starving.
Hope this helps.
Pete
[ This message was edited by: OzBloke on 2006-12-25 16:38 ]
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