4GC mystery...

Posted by Dave Harrison On 2018/6/28 4:55:33

Due to poor running and that I had a rebuild kit on hand I have removed and disassembled my 55 400, 4GC carb. Found several issues with dirt but main problem appeared to be the accelerator pump seal to be partially disintegrated and both primary and secondary float heights set too low which I have now corrected. The carb is still disassembled as I now have another issue that the accelerator pump inlet check ball is stuck in it's seat, no amount of soaking in various solutions or trying to blow out with compressed air or tapping seems to help, as everything else came apart so easily I am now of the opinion this has been driven hard into the seat during a previous rebuild. This makes me wonder how it ever worked properly in the past...?
The carb is the correct model 7007230 though almost definitely has been replaced or rebuilt at some time due to general good condition and still fresh looking gold anodising.
I have read back through several posts where the same problem has been encountered, does anyone have any opinion as to if I definitely have to get this out as I am now tempted to reassemble as it is and see what happens...
Makes me wonder if one of the professional carb rebuilders is doing this for some unknown reason...?

Regards, Dave.