Hi all,
I've got a 1997 19.5' Spectrum with a 4.3 LX Gen + Alpha 1 setup. I bought the boat 2 years ago. It runs great, but I can't get it to rev past 4100 rpm. Originally, I figured the boat was over-propped with a 21 pitch prop, so I bought a new Black Max 19 pitch and installed it. Still bang on 4100 rpm.
I performed a lot of maintenance on the boat this winter:
-Pulled the heads, all new gaskets from the block up
-New coil, plugs, wires
-New intake manifold, thermostat
-New fuel filter/separator & carb inlet filter
-Checked base timing, bang on 8 degrees
-Compression check: 168 - 172 across all cylinders
-Rewired all power cables (a lot of corrosion on old cables)
Engine starts, idles, seems to run perfectly. Feels under-powered on the bottom end and still will not rev past 4100 rpm.
So far I know:
-Timing appears to be good
-All new ignition components except ICM and distributor sensor
-New fuel
-Carb seems to be opening completely on full throttle
-No fuel filter restrictions
I've seen a lot of threads on this particular issue over the years, but I haven't seen any where the issue has been resolved. I'd appreciate any insights/advice.
I've got a 1997 19.5' Spectrum with a 4.3 LX Gen + Alpha 1 setup. I bought the boat 2 years ago. It runs great, but I can't get it to rev past 4100 rpm. Originally, I figured the boat was over-propped with a 21 pitch prop, so I bought a new Black Max 19 pitch and installed it. Still bang on 4100 rpm.
I performed a lot of maintenance on the boat this winter:
-Pulled the heads, all new gaskets from the block up
-New coil, plugs, wires
-New intake manifold, thermostat
-New fuel filter/separator & carb inlet filter
-Checked base timing, bang on 8 degrees
-Compression check: 168 - 172 across all cylinders
-Rewired all power cables (a lot of corrosion on old cables)
Engine starts, idles, seems to run perfectly. Feels under-powered on the bottom end and still will not rev past 4100 rpm.
So far I know:
-Timing appears to be good
-All new ignition components except ICM and distributor sensor
-New fuel
-Carb seems to be opening completely on full throttle
-No fuel filter restrictions
I've seen a lot of threads on this particular issue over the years, but I haven't seen any where the issue has been resolved. I'd appreciate any insights/advice.