Motor/Prop Question

Ando1001 · Post by **Ando1001** » Sun Sep 21, 2008 3:47 pm

G'Day,

I've got a small problem, so I thought i'd put it out there, to see what you all think.
I've got a 2008 Yami 50Hp 4 stoke motor on my 4.2 meter, centre console. It does around 40 km/h up on the plane at around 4700 Rpm. The motor is goverened at 5500 Rpm, however between 4700 and 5500, I don't get any increase in speed, just revs. Listening to the engine, it is doing it easy. I was wondering if anyone knows anything about props and whether or not a bigger one will give me extra speed through the top end rev range.

Cheers.

Ando

Dex38 · Post by **Dex38** » Sun Sep 21, 2008 5:16 pm

Talk with the people at Solas they willput you onto a prop that will suit your needs

All the w's.solas.com.au

rossco · Post by **rossco** » Sun Sep 21, 2008 8:37 pm

If you picked up the motor from I/O marine have a chat to them. They should have a few test props to try out. They changed my prop over after 18 hours (no marks on it mind you) gratis. Whats your current prop size. Every prop size change either adds or decreases revs by around 250 on a standard prop. Solas are also good for advice as previously mentioned.

Night Stalker · Post by **Night Stalker** » Sun Sep 21, 2008 10:56 pm

Sounds like you may need to adjust the motor hight on the transom.

Talk to the place where you bought it from.

Ando1001 · Post by **Ando1001** » Mon Sep 22, 2008 6:37 am

Yeah, it was from I/O marine, so i'll go see them. The prop is pretty marked now though, so no luck there. Thanks all, for your quick replies and advice.