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What we ended up with was some (not all) of the rings removed from one prop guy and the others left on by another. With no real way of testing them we don't know any before-after differance. The ones...

Well what we don't need is to make it harder to get on the plane or "Calvokate". We have enough trouble with both of them as it is!

Ive been told it's to keep the exhaust gasses away from the prop on take-off. Further i've been told some people cut (machine) them off, but there is no noticeable difference. So just leave them.

It's OK, I now know what it's for.

Thanks Fred!

Do you know if the Temp of the water your racing on makes a differance to anything?

Thats what I thought to, and the thermostat vs restrictor?

I've been "told" that is you remove the thermostst the engine runs hotter.... it's against my line of thinking but "they" say the water is moving to fast to get the cooling job done. I've also been...

Can anyone tell me the purpose of the faired end on a thru hub exhaust? We use Standard 3 blade, 9 1/4" x 11"P aluminium props on a 9.9 hp and cut them up. We also jack the outboard up once underway,...

Well, time is a tickin and we are running out of time before our first major race. So needing 5 or 6 new props just to get us to the finish line (ie 20-30km per prop!), we are getting them cut by...

Thanks Mike, that’s exactly what I was after. I'll try and take some photos as I go.

When we get to the stage of looking at cup, do we ‘gently persuade’ (read: hit with hammer) the blades over...

Ours is a Suzuki, three blade aluminum, thru hub exhaust. All the manufactures here only supply three blabe, aluminium prop for this size outboard. The sports class can use any prop they can find and...

Our racing we use 9.9 hp outboards, we have two people, flat bottom, hydraulic jacking transom. We have alot of stopping & starting with some long straights.
We have to use the manufacturers...