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Trim at WOT

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I have another tilt/trim question. Before when cruising at WOT, I could always trim my motor out as much as I want until it would start breaking loose and then I would trim it back down a bit. This weekend when I was out, it will now only trim out about half as much as I would like and won't trim any more at WOT. If I slow down or stop, I can trim it up all the way just fine. What would cause it to not trim further at WOT like it always has before? I'm only loosing about 2 mph off the top end, so it's not a huge deal. I'm just not sure what's going on and don't want something else to happen. It's a 1990 Johnson 90 hp. Thanks

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Check the oil level. Sounds like the motor doesn't have fluid to reach top height under load. A worn pump, or worn rams can cause this. When you push it all the way out at WOT your are practically asking the T&T to "lift" your boat, and the unit might be worn enough not to be able to lift to the max.

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Thanks, what is the proper way to check the oil level?

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tilt to full up position and remove the fill plug (large straight slotted screw), fluid should be level with bottom of fill hole.

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