XV750 Diaphragm

Question:

I need a Diaphragm, it is hard to get. Do you know or can direct me to any one? We have moulded one for now, but don’t know how long it will last. My bike is in great shape & clean as, I have done a lot of work to it. That is all I need now, I ride alot and luv it, Cheers! Rosie {Rosie, Victoria, Australia - 1981 XV750 Yamaha Virago}

Answer:

Rosie, I am not sure if you mean the petcock or carb diaphragm on the XV750, but here is the information I have for both.

Petcock Diaphragm

Fuel petcock diaphragm is available from K&L Supply located in California, US. K&L part number 18-6634.

Yamaha also sells it included in a kit of 3 pieces, part number 10L-W0092-00-00, Fuel Cock Valve Set.

This set also fits:

  • 1982 & 1983 XS400
  • 1982 & 1983 XS400 Seca
  • 1984 and 1986 XV700, XV700CS and XV700SS Virago 700 models - not sure if these were available in Australia
  • 1982 & 1983 XJ750 Maxim
  • 1981, 1982 and 1983 XJ750 Seca
  • 1983 XV750MK Midnight Virago and XJ750MK Midnight Maxim
  • 1982 & 1983 XV750 Virago 750
  • 1982 & 1983 XV920 Virago with shaft drive
  • 1981 & 1982 XV920R Virago with chain drive.


Carburetor Diaphragm

It is more likely that you are looking for the Hitachi carburetor slide diaphragm. The Hitachi carburetor diaphragm of the US model, OE part number 4X7-14940-01-00, Diaphragm Assembly has been discontinued by Yamaha. I assume the Australian model’s has been discontinued also.

Your only options now are to look for used parts or complete set of carbs, locate some NOS parts or find a new source for new Hitachi carb parts.

The problem with rubber parts located inside a carburetor is that when you finally locate them they have either been stored dry and are cracked or they have been sitting in old fuel for years and have gone mushy.

If you decide to go with used parts, it is important to know that the carbs on your bike also fit the:
  • 1983 XV750MK & XV920 Midnight Viragos
  • 1982 & 1983 XV750 Virago 750
  • 1982 & 1983 XV920 Virago with shaft drive
  • 1981 & 1982 XV920R Virago with chain drive

So when you are searching for used and NOS parts, keep in mind that not everyone knows that the parts fit other bikes or what the Yamaha part number is.

A good place to locate used and NOS parts is eBay.



For new parts you can try these sites: Cameron Carburettor Parts in the UK or MotorcycleCarbs.com located in the US. I have heard good things about both of these sites. Supposedly the guys at MotorcycleCarbs.com have found a way to get brand new slides with diaphragms for Virago Hitachi carburetors.

The later Virago 750s, 1988 and later, have Mikuni Carbs. Parts for these are still available. If you are feeling ambitious, you should be able to swap your Hitachi carbs for a later Mikuni set, but you will need to change to the later model carb holders and may have to adjust the jetting, fiddle with the cables and venting tubes to get it perfect.




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