2A Power Loss

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Originally Posted by ian4002000

Sounds to me its got a fuel delivery problem and is running lean.
could be something floating around in the tank blocking the pickup pipe or a worn out fuel pump.
Take the pipe off the carby and turn the engine over fuel should pump out.
if it does it may be a sticking needle and seat, if not go back through the fuel system until you find a problem.

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I agree with Ian....sounds like lack of fuel

cookey

Thanks for the thoughts guys. We have pretty well eliminated the fuel - rebuilt the carbie, new fuel pump, cleaned lines from both tanks, cleaned the tank selection tap, seen fuel pump ok.

Have spent hours working on it and the only thing we haven't done is disassemble the distributor which is scheduled for Tuesday. Hopefully on Wednesday I can post some good news.

Howard

Problems like this can be so hard to diagnose from a distance especially when it could be in the fuel; ignition; or valve-timing dept.

Just in case it is something blocking the main jet, an easy way to eliminate it, or prove it, is to run the engine whilst it is playing-up and then pull the choke/fuel enrichment device on.

If the jet is clear the engine will run worse and flood; if it is blocked the richer mixture will cause the engine to behave almost normally.

I have had this happen to me at least twice on two different vehicles. Use high pressure air and wear eye protection when blowing out every orifice in the carburettor,

Cheers Charlie

Replaced the distributor today and all runs fine now. Looks like the centrifugal advance failed.

Howard

Thanks for letting us know.

Another possibility (still distributor) is that the top bush of the distributor has failed so the cam has considerable sideways movement so that the set points gap bears no relation to the effective gap once the engine is running. Although I think your symptoms sound more like the failed centrifugal weight spring.

John