GForce wrote: shit in my carb bowl?
i don't think taking a dump in the carbs will help. (just HAD to say that)
since it has just been worked on thats the first place i'd be going and asking them about it.
as for those 'wonder clean' type products.. lets say i'm sceptical.
if there is ah, foreign material, in the tank (dirt/water) it needs to come off for a wash out and the float bowls at least drained, preferably off, to make sure there is no sludge in there.
OMO is good. fuel is better.
Mr Stompy has it though - simplest things first. drain tank, replace filter.
no kinked hoses like Glen says?
make sure vacuum tap (it is a vac tap?) is working properly.. again, with no kinked hoses.
i've done this a thousand times and no-ones ever been hurt. much.