DT150 Bogging on first plane
Hi. My 2002 DT150 is bogging down when I come up on a plane for the first time during a days' use. It happens like this. I put the boat in the water and it starts up fine. Runs a little rough for a minute with low rpms sometimes and can be enough to throw the oil alarm at times, then it clears up or I shut it down and start back up to clear it. I then idle out through a no wake zone for about five minutes. Sometimes it's letting out a lot of smoke when idling through the no wake zone. Then I throttle up to get the boat on a plane, it bogs down. It gains rpms slowly until the boat planes then the motor clears up and runs fine. For the rest of the day, I can go to my spots and shut the motor down for long periods, start it up and it runs up through the rpms when planing off without a single hitch.
Can't be plugs since it did this even when I replaced them last year. There is no water in the fuel. I thought about fuel pumps, but my thinking is that if it was fuel pumps, it would do this every time I plane off. I could be wrong though. My next option would be injectors, but then again, wouldn't it do it every time with injector problems also?
I've also thought about the extra smoking through the idle zone could be the engine getting too much oil at low rpms and fouling the plugs, causing it to bog down that first time plane and burning the oil off of the plugs then clearing up. But how is the pump pushing more oil than needed at those low rpms? I just remembered seeing an arm going to the oil pump from the throttle linkage when looking at the pump one day. I wonder if it can be adjusted.
Would really appreciate some input if anyone has had any experience with this. Thanks!