Yamaha hi thrust prop

Discussion in 'Buy / Sell / Trade / Wanted Forum' started by bentley, May 12, 2019.

  1. bentley

    bentley Active Member

    I have a older Yamaha 9.9 woth a hi thrust prop, looking to trader the prop for a normal prop, if any body out there has one I will trader them this one, or purchase. Thanks
     
  2. spring time

    spring time Well-Known Member

    Is it a high thrust motor because I think they are geared differently than a normal 9.9 and you won’t get the performance out of it
     
  3. profisher

    profisher Well-Known Member

    Yep high thrust gearcases are designed for the high thrust props. You should change the gearcase as well to match the new prop.
     
  4. bentley

    bentley Active Member

    I have no idea, if it has a high trust gear case, I’ll check into this. Thanks
     
  5. profisher

    profisher Well-Known Member

    If the gearcase is as wide as the hub of the high thrust prop it is a high thrust gearcase.
     
  6. bentley

    bentley Active Member

    So it looks like it’s a high thrust, the T in the serial number represents a high thrust model. I would be interested in trading or making a deal, if somebody has a need for a high thrust kicker, I think this one is 1993, 4-stroke, electric start, log leg.
     
  7. AlK

    AlK Well-Known Member

    I don't see a problem using a regular prop with a high thrust gear case, if it were the other way, then yes the high thrust prop would put a lot of strain on the regular gear case.
    Can someone shed some light on this?
     
  8. profisher

    profisher Well-Known Member

    The gearing in the leg will mean you will run out of rpms on the engine before you make any speed with a normal prop on it. It is geared lower, kinda like a crawler 1st gear in a pickup. Not that low but lower than a regular leg.
     
  9. bentley

    bentley Active Member

    Thanks for the advice guys, still wouldn't mind trying a different prop on it, if anybody has one kicking around. PM me
    Thanks,
     

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