Here's the jist: got the 1995 SPL88 motor with an 18' CC boat. (first boat owned), after couple runs on the water, power was flat, inspection revealed a heavily burned piston. (see pics)
I got a line on a 1986 88SPL powerhead, 200 bucks. compression 105ish psi. swapped powerheads. It gets me around but rpms never get past 4200rpm with a std 15pitch prop, light gear and just me. (with clean carbs). It runs, but its got the tell-tale piston slap tick goin on.
back to the original 95 powerhead. the pictures show both cylinder sides.
all pistons are already 030 over, and I placed an 010 feeler gauge between piston and wall in pic, and later fit an 024 between 1 of em.
As I have far more time than money at the present time, I was intending to send the block to get bored to 040, get a set of 040 pistons, clean up the passages, grab a gasket set and reassemble. All with the hope of getting 140/150 psi from it and ultimately my cruising speed and reliability up again.
While I'm full aware that going cheap always has its perils, it would not be beyond me to simply hone and re-ring the 'good' side, get the charred side bored and refit with 040s. (yes, to save on cashflow).
I have not torn the motor down as of yet, but that'll be happenning tonight.
I guess the pertinent question is: Is there a ship-sinking hole in this approach thats obvious that I dont see. Is the motor itself past reliable overbore tolerance? etc.
thanks
I got a line on a 1986 88SPL powerhead, 200 bucks. compression 105ish psi. swapped powerheads. It gets me around but rpms never get past 4200rpm with a std 15pitch prop, light gear and just me. (with clean carbs). It runs, but its got the tell-tale piston slap tick goin on.
back to the original 95 powerhead. the pictures show both cylinder sides.
all pistons are already 030 over, and I placed an 010 feeler gauge between piston and wall in pic, and later fit an 024 between 1 of em.
As I have far more time than money at the present time, I was intending to send the block to get bored to 040, get a set of 040 pistons, clean up the passages, grab a gasket set and reassemble. All with the hope of getting 140/150 psi from it and ultimately my cruising speed and reliability up again.
While I'm full aware that going cheap always has its perils, it would not be beyond me to simply hone and re-ring the 'good' side, get the charred side bored and refit with 040s. (yes, to save on cashflow).
I have not torn the motor down as of yet, but that'll be happenning tonight.
I guess the pertinent question is: Is there a ship-sinking hole in this approach thats obvious that I dont see. Is the motor itself past reliable overbore tolerance? etc.
thanks
