Starting problems

steved1957

New Member
Hi, 3lt very difficult to start from cold, it will eventually run on tickover but won't rev, when it does eventually run normal it has plenty of power and really smooth.
It has a brand new SU Carburettor on it, inline fuel filter is clean, it has a good spark, fuel in the float chamber, i don't know a lot about SU carbs so would appreciate any pointers as to what it could be.
Thanks Steve
 
I haven't looked at that but will have a look tomorrow, as i say once it gets warm it runs sweet, plenty of power, it will start and tick over for maybe 30 seconds and then dies, i was beginning to think condenser, have one coming Friday will try that if i don't succeed before then.
 
Also check that the mechanical advance in the dizzy works smoothly, even when cold. Remove cap, you should be able to turn rotor easily against a spring, if not investigate - screw inside under the rotor might need oiling.
 
There is oil in the carburettors?
The damper only does something when the car is being driven. It slows dropping of the piston due a sudden change in manifold pressure, replacing an accelerator pump on conventional carbs.
 
The damper only does something when the car is being driven. It slows dropping of the piston due a sudden change in manifold pressure, replacing an accelerator pump on conventional carbs.
In essence you are right, but it actually works the other way , it slows the lifting of the piston slightly when the throttle is opened, this means the depression on the jet increases and enriches the mixture for acceleration. Dropping of the piston is hardly affected at all.
 
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