Yamaha hi thrust prop

[bentley]

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

 

[spring time]

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

 

[profisher]

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

 

[bentley]

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

 

[profisher]

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

 

[bentley]

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.

 

[AlK]

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?

 

[profisher]

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.

 

[bentley]

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