Depends on the NRV you have chosen...If it is a YS style check valve you are OK.


As for inside the fuse...it should be fine with a YS style check valve....Some versions out there are small ball types...the YS version is a light silicone flapper.

I would say your engine is very very rich.....at 2.5 turns open. But I don't know without hearing it....Peak it out and back off 200-300rpm from the peak valve.

The DZ engines have a very flat repsonse on the Needle valve and sometimes you can move 1/4 turn with little to no change in RPM....you want to be on the lean side of this flat spot...200-300rpm short of the Peak RPM


Troy Newman
Team YS