# Merc Props

**URL:** <https://forum.bigfishtackle.com/t/merc-props/104655>\
**Category:** Boats & Motors\
**Created:** [June 11, 2007, 2:47am UTC](https://forum.bigfishtackle.com/t/merc-props/104655 "2007-06-11T02:47:59Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Mike\_K](https://avatars.discourse-cdn.com/v4/letter/m/ac91a4/32.png) [@Mike\_K](https://forum.bigfishtackle.com/u/Mike_K)\
**Post date:** [June 11, 2007, 2:47am UTC](https://forum.bigfishtackle.com/t/merc-props/104655/1 "2007-06-11T02:47:59Z")

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I just purchased a new tracker with a 40hp, merc outboard, EFI. My problem is I fish at higher elevations such as Otter Creek reservoir. I believe I have a 10 pitch prop on now and I cannot plain my boat. I tried an 8 pitch but that made my engine vibrate. Can anyone with same engine advis?