Guys i'm pretty stumped on this one.
Recently bought a 16 foot peterbourough boat with a 75hp johnson stinger for a little fun with intentions of doing a little watersking.
I'm really disapointed in the performance of the motor. It can barely get the boat out of the water.
Went home pulled the carbs off cleaned them + 3 little jets at top also used compressed air to clean off.
Also was told the a planer(spoiler) on the rear of engine would help the boat plane better.
Back to the lake(7pm). Much better, boat was able to pull itself out of water,(don't know about a water skier though) ran it for about an hour, i'd say test run was positive. Called it a day.
Today i went out on the lake with boat ran decent for about 15 minutes. Then it lost all power and just doesn't seem to be all there. It ides fine, starts fine, when i take off, powers not there, it takes forever for the motors rev's to pick up, Hobbled back to the marina.
1. Compression is 140 #1 cylinder
130 #2 cylinder
2. Carbs where cleaned, twice
3. throttle linkages are operating like they should, choke as well
4. spark is strong on all 3 plugs
5. water pump is good(i pulled the lower unite apart)
Could anyone please help me out with this problem, it seems so weird.
Could a reed valve/fuel pump be playing tricks on me, i don't see much more that can be replaced?
Thanks for looking.