Originally Posted by UKpatternflyer

Hi All,

Thanks for your replies. My Yamada sorted it out in an email. In fact if I'd read the instruction manual for the 200 CDi, it would have told me.

When I replaced the head on my 185, it came with the new injector. However when I set it all up to run I used the original thick walled silicone from needle valve to injector. The new one way valve relies on the fuel tube flexing under pump pressure, thereby allowing fuel to flow between the inside of the fuel tube and the outside of the nipple before reaching the small hole that's drilled across the diameter of the nipple a few mm back. That's why the "normal" orifice to the nipple is blocked. The solution is to do as YS say and use thin walled silicone which allows enough flex at the nipple to allow the fuel to flow in this manner. And it says this in the manual as well!

I didn't run the 200 after seeing the issue with the 185 head, thinking the new injector valve was somehow faulty... how did I check this.... I took a long length of thick walled tube and connected to the injector and found I couldn't blow through it!

Both engines running great now.

Thanks

Keith