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Hi Brian Here.
Iv'e posted a similar reply regarding flat spots on accelerating from idle under a topic "reusing carb gaskets"
If the carbs are the amal Mk2 concentrics (930 series) then never reuse the gaskets.
So if your carbs have been stripped for cleaning and new gaskets were not fitted, it coul;d be your problem.
the reasoning is:-
the float chanber gasket not only seals the float chamber it also seals the drillway for the idle jet fuel pickup.
If you remove the float chamber casting you will see a drilway going to the bottom of the float chamber, this is the idle fuel pickup.
Now if the floatchamber has been removed and the old gasket used, it may seem to have sealed (I.E. no leaks) BUT if the gasket is damaged near the drillway then the idle jet cannot suck up enough fuel. The idle air adjustment could then have been incorrectly set in order to get the thing to idle, but with the throttle is increased between idle and 1/4 throttle the carb is using the idle jet and throttle cutaway.
but as i just discussed the idle adjustment is incorrect.
So in conclusion, it's worth fitting new carb gaskets and then checking the idle adjustment.
hope this helps
Brian
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