Hi
I need some advices
I have MVVS 61 DFS- diesel The contra piston clossed to the end if I try to open it, it sound not good and the rpm goes down even I change the needle.
When I try to close the needle it rpm goes down.
The best tuning I get is when the engine vary to maximum rpm and then go down back and force
it not stay at full rpm (screaming)
I try prop 14x6 and 13x8. At 13x8 I get 8100 rpm but the sound is not steady screaming (rpm goes up and down)
Thanks
Barkai