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Low rpm on full throttle.

Josko

.
Aug 29, 2021
7
Beneteau Antares 640 Sibenik
Hi everyone,

I have Perkins Prima M50 1989,1800 hrs,the problem I have is that engine on neutral runing 2800 rpm witch is fine,and when it’s runing on full throttle it’s showing 2100,before it was running on 2600 rpm,I am not sure what’s going on,it’s a little white smoke from exhaust,fuel primary and secondary filter has changed and very little oil consumption,my opinion is that could be air in the fuel sistem so I need to bleed the air out,if anyone have any advice much appreciated,thanks.
 
May 24, 2004
6,765
CC 30 South Florida
Check fuel flow, other than clogged filters sediment in the tank can clog pickup tube. Check the air intake tube and exhaust system for any obstruction, air filter, manifold, mixing elbow, muffler and exhaust port. Check the valves lash.
 
Last edited:

Josko

.
Aug 29, 2021
7
Beneteau Antares 640 Sibenik
W
Check fuel flow, other than clogged filters sediment in the tank can clog pickup tube. Check the air intake tube and exhaust system for any obstruction, air filter, manifold, mixing elbow, muffler and exhaust port. Check the valves lash.
Will try,many thanks.
 
Oct 26, 2010
1,405
Hunter 40.5 Beaufort, SC
It could also be fouling on the prop or something wrapped around the shaft