its just an unhappy situation that has everyone say...did u feel that?
What i've observed is that while say slow-waking, motor under load, an obvious shutter periodically travels the length of the hull. I dont feel anything at WOT or at no-wake speeds.
What might be some of the causes of a low rpm shutter?
My thoughts are:
a: at low-rpm under load, an engine misfire is simply being amplified due to the constant load on the motor. If thats so, then an electrical issue exists since its erratic? From a probability standpoint, where would I start looking.
b: there is high-resistance from the lower-unit/prop that engages, then releases? probability: IMO low.
c: deep internal crank-bearing issue?
Knowns:
- motor: 1995 88SPL w/1989 powerhead
- psi: 120+ all cylinders (checked yesterday)
- carbs: both removed and cleaned (last week)
- link n sync: (yesterday)
- splugs: all firing (checked yesterday)
- timing: set last week
- prop: 13.75x15 SS (looks to be great)
- boat: 1995 17' center console
What i've observed is that while say slow-waking, motor under load, an obvious shutter periodically travels the length of the hull. I dont feel anything at WOT or at no-wake speeds.
What might be some of the causes of a low rpm shutter?
My thoughts are:
a: at low-rpm under load, an engine misfire is simply being amplified due to the constant load on the motor. If thats so, then an electrical issue exists since its erratic? From a probability standpoint, where would I start looking.
b: there is high-resistance from the lower-unit/prop that engages, then releases? probability: IMO low.
c: deep internal crank-bearing issue?
Knowns:
- motor: 1995 88SPL w/1989 powerhead
- psi: 120+ all cylinders (checked yesterday)
- carbs: both removed and cleaned (last week)
- link n sync: (yesterday)
- splugs: all firing (checked yesterday)
- timing: set last week
- prop: 13.75x15 SS (looks to be great)
- boat: 1995 17' center console
