Tiny Tiger pump function

[duradad 0]

I have a tiny tiger carb that I thought i had disassembled very carefully. I want to replace the diaphragm and need a source. Also, I'm sure this carb has never been apart before,  but I  cant find any sign of the diaphragm "disc" shown on the parts list.  So, I will need this also.  I looked very carefully and can't see how I may have lost it. Any chance that this engine was running fine without the disc ?

 

I don't understand how this carb pumps fuel. The pump carbs that I have worked on usually have a port hole or hose to the crankcase and the diaphragm action is via crank case pressure. Other than the primer valve. What causes the diaphragm pump action while the motor is running ?

Edited 19 hours ago by duradad
Second question.

[Wallfish 714]

19 hours ago, duradad said:

I have a tiny tiger carb that I thought i had disassembled very carefully. I want to replace the diaphragm and need a source. Also, I'm sure this carb has never been apart before,  but I  cant find any sign of the diaphragm "disc" shown on the parts list.  So, I will need this also.  I looked very carefully and can't see how I may have lost it. Any chance that this engine was running fine without the disc ?

 

I don't understand how this carb pumps fuel. The pump carbs that I have worked on usually have a port hole or hose to the crankcase and the diaphragm action is via crank case pressure. Other than the primer valve. What causes the diaphragm pump action while the motor is running ?

Some had a small disk attached to directly to the diaphragm, some did not but had a larger disk part that covered the entire surface. Maybe post a picture of what you have.

Depending where you're located, I have diaphragms. 

 

The pulse still comes from crank pressure/vacuum. But a 2 stroke uses a reed valve to control it then and it's right through the carb that pulses the diaphragm.