Originally Posted by DCChadow
Have searched for the topic for a couple days now...but no luck.
I found several cracks in the diaphram while i was inside the carbs...looked everywhere that i can think to look....are there aftermarket replacements for the spirit 750 diaphram or is it a dealer only 108.00 each piston situation? I dont mind used ones but im not finding that either...
I can normally find my answers...but im out of places to look....
This is from the Wolfs bike shop:
Motorcycle carburetor diaphragms become torn, dry, cracked, delaminated, hard, and or brittle over time. All of these signs are bad and deem replacement. The diaphragm's function is to act as a bladder when velocity in the carbs venturi increases. This pressure differentiation lifts the diaphragm against the spring 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. Also delamination is a sure sign that more damage is surely on the way.
As for my solution for this problem of holes in diaphragms I think I may have a cure for this common problem. First, disassemble the diaphragm from the slide as far down as possible. Second, go to your local NAPA parts store and purchase a can of spray rubber coating. Third, paint your diaphram with the rubber coating with a thin coat on both sides, allowing to dry over night.