Spider and shaking above 22k rpm

JoeFo86

Seaman Apprentice
Joined
May 28, 2017
Messages
31
So I got my boat fixed up, new risers and manifolds, engine coupler, all new plugs, new starter.
Took it out for a ride everything seemed good went to get moving and as soon as I go over 2200 rpm boat shakes seriously, and it sounds like it's choking itself out. Almost as if the carb is dirty, Or bad gas? Maybe wrong pitch on prop?
Any ideas would be great.
PXL_20210624_231823076.jpg
 

Attachments

  • PXL_20210804_185124347.jpg
    PXL_20210804_185124347.jpg
    2.2 MB · Views: 3

Scott Danforth

Grumpy old guy who plays with boats
Joined
Jul 23, 2011
Messages
37,045
how old is the gas?
have you tested fuel pressure?
have you done a compression test?
did you align the motor when you re-installed it?
 

JoeFo86

Seaman Apprentice
Joined
May 28, 2017
Messages
31
how old is the gas?
have you tested fuel pressure?
have you done a compression test?
did you align the motor when you re-installed it?
Gas 1 month old, no, no idea how, no, mechanic did all work listed above. I can't afford to pay him more :)
 

JoeFo86

Seaman Apprentice
Joined
May 28, 2017
Messages
31
Ok update..
Took it out today again. Was able to go to 3k rpm. Overheated, flame arrestor has water n gas inside, carb has water on top screw, oil is clean but overfull by a quart or so... Ideas?
 

Bondo

Moderator
Staff member
Joined
Apr 17, 2002
Messages
68,255
Ok update..
Took it out today again. Was able to go to 3k rpm. Overheated, flame arrestor has water n gas inside, carb has water on top screw, oil is clean but overfull by a quart or so... Ideas?
Ayuh,..... Pump a quart off the bottom of the base, 'n figure out where the water is comin' from,.....
 

oldboat1

Fleet Admiral
Joined
Apr 3, 2002
Messages
9,193
If you have a 4BBL, when water intrusion corrected, check secondaries and throttle operation at wot.
 
Top