What's this? How do I tell if my diaphragm is still ok? Motorcycle carburetor diaphragms become torn, dry, cracked, and brittle over time. All of these signs are bad and deem replacement. The diaphragm's function is to act as a balloon when velocity in the carbs venturi increases. This pressure differentiation lifts the diaphragm and hence the slide. If the diaphragm has any holes, cracks, splits, etc. then the pressure will leak past the diaphragm and not raise the slide at the correct rate or at all in some cases. Availability: The problem is that many OEM's have discontinued carrying the Throttle Slide/Diaphragm assembly. Some vendors (K&L Supply specifically) do supply aftermarket slides. But sometimes there is just no replacement available. So then what? Have us re-diaphragm your slide. Chances are that we can either provide OEM, or aftermarket slides, or have them re-diaphragmed. We are able to service most models. Contact us if you have a special application and we will see if we have the molds for that diaphragm available.. The average price is $110 per slide and a one time $80 setup charge per order..  Diaphragm repair, the way it works:  Send us your diaphragms and we will press apart the folded retainer and slip off the retaining washer. Refit the slide with a new custom molded Nitrile rubber diaphragm and press the retainer back in place. Special jigs are used on this precision job to ensure quality. Diaphragm repairs will have an additional $80 setup charge added to each order. Each type of diaphragm needs machine shop setup. These setups are for both the manufacturing of the diaphragm rubber, and the work necessary for the installation of the diaphragm. This setup charge is incurred on each order weather you repair one or one hundred diaphragms. Keep in mind this is a low volume last resort solution to diaphragm replacement and that is why the price is as such. There is just no other way to provide this service at this time for any less. Shipping and Handling from our location to you in the US is $6.95 for the first slide + $1.00 for each additional. The turn around time is 3 weeks.