My 750 GT running extremely rich

J

Jotabene

New member
I have a 750 GT (1969) which runs extremely rich. I have the following carburetor setting.
Main jet: 115
Idle jet: 55
Needle jet: 265N
Needle: V3
I have check and set the float level to 24mm and I have also replaced the choke plungers with new ones. Which out any effect.
When I put the needle in the first notch (the top one, standard is the middle) it became slightly better but still too rich. With the needle in the first notch I also disconnected the rubber manifolds, running only with the trumpets. This didn't improve anything.

Anyone having an idea of what can be wrong?
 
How about NEW needles and needle jets?

V3 needles haven't been available for quite some time, needle jets are rarely replaced... always look "OK" once through the ultra-sonic, but in reality are usually totally knackered.

I may be able to supply new V3 needles and 265N jets in the near future, have to see what the suppliers say.

piet
 
Thanks Piet,
It's the needle jets that have "eroded". I will check around in Sweden for new ones. If I don't find any I will be interested when you get them. 
 
Really no point in replacing the jets only, just does half the job...

Going to take a while yet, but I'll let everybody here know.

piet
 
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