450t Carb Diaphragms

[jeffasaurus2]

So after much of your standard maintenance,
- Complete carb rebuild, tear down, soak, o-rings, bench sync, etc.
- Valves Adjusted
- Replaced Intake and Head boots + O-rings
- Sealed airbox, new filter
I still seem to have a vacuum leak. After much deducing I believe it to be coming from the Caps on my CV carbs.

I realize that this is a diaphragm problem and not wanting to spend the $100+ on new diaphragm's found this, http://www.jbmindustries.com/Yamaha650.html

I'd like to know if anyone has tried these, can speak of their quality, or if it is even worth my time. Does anyone have any other suggestions for me to avoid replacing the diaphragms?

I will admit that while rebuilding the carbs I did them both at once and failed to mark the diaphragm that went with its respective carb so I'm going to try to switch the diaphragms in the carbs and if that doesn't help then I'll switch the caps as well, essentially trying all possible cap-diaphragm-carb combinations.

I would still like to know thoughts on the replacement rubbers linked to above though!

 

[Nessism]

Inspect the diaphragms carefully before you do anything. Tears and holes should be obvious. A visual inspection should be fine. If you find damage I'd just get a used diaphragm. They aren't that hard to find.

 

[jeffasaurus2]

I've definitely gone over the diaphragm with a fine tooth comb, no tears, holes, rips or any sort.

I figured that where the cap clamps down on the outer ring of the rubber isn't sealing properly considering a thirty year old piece of rubber.

Where would you recommend I begin my search for a used one?

 

[jeffasaurus2]

Any suggestions?

 

[Nessism]

I suggest you find something else to worry about. Those diaphragms are fine.