Bogging At Full Throttle

[NS95]

the gauge is probably off. it is a 39 pd. pressure reg. and usually reads 36+ pds. at schader. determine the reg. is good, like one guy said, clean all vst filters and the fuel pres. reg. filter while you are at it. is the bulb staying primed?

Yea the bulb is fine, just replaced it with oem mercury a month or so ago. Ill have to hit up autozone and get the loaner gauge friday and get some more accurate numbers.

[NS95]

Got a gauge on it today.
Idle=35psi
Cruise (3/4 throttle) @3500-4kRPM=20psi
4k+(full throttle)=10-12psi
I do have a video if that helps.

[EuropeanAM]

Got a gauge on it today.
Idle=35psi
Cruise (3/4 throttle) @3500-4kRPM=20psi
4k+(full throttle)=10-12psi
I do have a video if that helps.

Problem is one of the following:

-Inadequate fuel supply in the VST
-Restricted INLET screen to fuel pump
-Weak Pump (or leaking pump outlet seal)
-Pressure Regulator Problem (least likely).

Did you get pressures at 15/30/60 seconds after shutdown (also)?

[NS95]

Problem is one of the following:

-Inadequate fuel supply in the VST
-Restricted INLET screen to fuel pump
-Weak Pump (or leaking pump outlet seal)
-Pressure Regulator Problem (least likely).

Did you get pressures at 15/30/60 seconds after shutdown (also)?

How would I go about checking those symptoms? No I forgot about that part but the time I did look after shutdown it was holding pretty steady around 30-35psi @15sec if i had to guess but I can check again tomorrow.

[EuropeanAM]

Portable fuel tank, line and bulb, connected directly to the pulse/diaphram fuel pump (and a fresh fuel filter) would be a good starting point.

This will allow you to say the problem is "inside" or "outside" the cowling.

[NS95]

Portable fuel tank, line and bulb, connected directly to the pulse/diaphram fuel pump (and a fresh fuel filter) would be a good starting point.

This will allow you to say the problem is "inside" or "outside" the cowling.

Went out today and on the way back in I went to test it, and I was able to go full throttle without any hiccups. Got it up to 52mph @5200rpm. Did it multiple times to make sure and she opened up all the way. Haven't a clue on what was the problem.

[EuropeanAM]

5200 is pretty low for that engine....

[NS95]

I'll take it out again to make sure that's all I'm turning .
my manual says 5k-56k so Im sure I can find those few RPMs

[JOE54]

cooler weather needs to turn around 5900 with normal load that will be used/ what prop????

[NS95]

cooler weather needs to turn around 5900 with normal load that will be used/ what prop????

I'm not home to make sure but I wanna say tempest 25p

[JOE54]

kind boat ?????

[NS95]

92 ProCraft v-180b
its a laser2 25p prop

[JOE54]

for sure should turn laser enough tunned up running good yes sir

[NS95]

for sure should turn laser enough tunned up running good yes sir

I'm sorry..what?
ive noticed when I go full throttle it seems like there is quite a bit of tension at full. Almost feels like it's binding somewhere and doesn't want to let me lay the throttle flat.

[JOE54]

it should turn 25 laser enough rpms/ might want to check linkage on engine for full throttle operation

[NS95]

10/4