High screw almost in but still rich

[Old2stroke]

I m thinking if it doesn't seal around the valve or the diaphragm in the valve is stuck..

Never seen one leak around the nozzle valve and the diaphragm is supposed to be fully open for high speed operation. Have you ever checked the inlet valve pop-off pressure to make sure inlet valve isn't leaking?

 

[Stergos Rodos]

Never seen one leak around the nozzle valve and the diaphragm is supposed to be fully open for high speed operation. Have you ever checked the inlet valve pop-off pressure to make sure inlet valve isn't leaking?

Its my next job to do. Checked only blow not suck air. If it doesn't work how can i fix it? Cut an old diaphragm and put it in?