Tom, have you confirmed that you are getting fire to #3 & #4?
If so, follow Pauls directions.
> Well you definitely need to find out what is causing that before splashing
> out on a rebuild, or replacement carbs. Could be something really silly
> and simple.
>
> Assuming you have HSs remove the float chamber lids, is there about the
> same amount of fuel in each?
>
> If none in the rear then check the rear float valve and the line feeding
> that cover for flow.
>
> If the level looks about the same replace the covers, remove the air
> filters so you can see the top of the jets, connect a tube to each float
> chamber vent port in turn, blow in it gently, and you should see fuel
> bubble up out of the jet.
>
> If not the jet or pipe appears to be blocked, the sealing washer can
> decompose.
>
> If that's OK look in the intakes as you open the throttle and watch the
> pistons, they should both rise the same amount, and both be delayed by the
> dampers the same amount.
>
> What are the rear plugs like compared to the front? We've just gone
> through this same symptom for someone elsewhere and they were black and
> sooty, which eventually proved to be a .100 jet in the rear carb and a
> .090 in the front, i.e. a grossly rich mixture even with the rear jet
> wound fully up. Something which should have been obvious by a failure to
> adjust the mixture from weak, through correct to rich and back again on
> that carb. That took three months and 99 posts to resolve!
>
> PaulH.
>
>
> ----- Original Message -----
>> ... With the air cleaners off I put my hand
>> over the air intake of the front carb. It wants to choke out and stall.
>> When I
>> do this on the rear carb it does'nt act the same. Maybe there is a jet
>> clogged
>> or trash in the carb line. The engine will run with only the front two
>> plug
>> wires connected and not with the rear two only connected.
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