The butterflies may not be properly aligned in the carb - and not be
closing correctly. You might also have a stuck or broken valve on the
butterfly - if you have the emission type. I solved a similar problem by
getting butterfly that have no holes or valves in them.
Take the carbs off and take a look at the butterflies - you can adjust
them on the spindle - relax off the throttle screws, undo the screw on the
butterfly and flick them a couple of times - then do the screw up again.
The butterflies (if Ive got the name right) are the brass coloured valves
that are on the spindles.
James
Richard Gosling said:
> Peter,
>
> You say that the idle can't be lowered below 1000rpm, even with the
> throttles fully closed. Well, with throttle fully closed the engine
> shouldn't run at all! This might suggest that air is getting in
> somewhere it shouldn't. One possibility could be where the throttle
> spindles enter the carbs - if this area is worn then it can let air in
> causing uneven idle as you'ved described. However, if air isn't
> entering the engine past the carburettor jet I can't see how then engine
> would run, as it still needs fuel...
>
> Still, one area to look at.
>
> Richard & Daffy
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