Well I've seen them rusted and still working but you can get a whole new intake piece from http://www.aircooled.net http://www.cbperformance.com http://www.800luvbugg.com any of these places have the whole intake piece.. They cost around 60 dollars.. also if you wanted to go used http://www.thesamba.com But I found the newer ones don't work to well.. The 74 model heater riser I think is one of the best since they are so huge that it takes it a while to get clogged.. Also when you start the car and let it run from being cold if you can see ice appearing all down from the base of the carb to where the heat risers are then they are clogged. Or if you drive for a couple of miles to where the engine should be warm and the intake has a coat of thin ice then yeah they are clogged.. The only other way to fix your problem is to richen your mixture but yeah I wouldn't go that route.. The mechnic that made my carb go that route opened up my jets a little bit more and I've never been able to get the carb right since..
I know you can use one of those brushes that you clean a gun barrel out with sorta.. Also a clothes hanger to get the initial knock through.. Be careful though cause you can shove a hole right through the top of an end since they tend to be fairly thinned out..
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