Whats the best bottom end bang for the buck ? My 1200R won't turn that 13/19. Bog city . Put the stock prop back on and its money. Need to get some tork to spin that thing out off the hole. Already sealed the pump , ride plate and intake grate. And right now my concord 13/19 is a paper weight.

That sound incredibly hard to believe. Are you SURE that you have a 13/19 and not 14/20? You should be getting a MUCH better hole shot with the 13/19 than with the stock prop.

It doesn't make sense. Is your engine in good shape? Compression?

13/19 is defenitly not too much prop for a GPR. I put one on along with the pump plug kit and top loader intake grate. Increases my hole-shot a lot

I have been watching to see if you cured that problem or not.

You put the stock prop on and now it runs good ?

I have installed that prop on 4 different Rs and nothing but GREAT results.

Droptop,you at sea level? If so, that 13/19 should have woke it up.

Has that 13/19 been blueprinted? Where did you purchase it?

I am with all the others.. that 13/19 with a top loader should provide a quick "on-plane" jump.

The 13/19 concord is stock. I got it at parker yamaha with a billit nose cone R&D aqua vien intake and pro series ride plate. Also pump is sealed. I'm at sea level in Florida. Motor has 7 hrs. Bog city. I don't understand it but the stock prop is back on now and its fine. Its a 13/19 for sure its stamed on it.

is it part # YF-CD-13/19

could it be possible that the 13/19 he put on was not a 13/19 at all? Maybe he just got a prop that was really not pitched to 13/19. far from 13/19

The only thing I can think of is something like this. Could the impeller washer stuck to the stock impeller and you installed the 13/19 without it? Even if you did you should have no problem turning it. But if it set to close to the veins and was rubbing a little or something like that. And when you installed the stock impeller back on the washer went back on with it. I don't know and I am not saying you did this, just looking for ideas why the 13/19 didn't make a huge improvement. Beats me...

Let us know what you find out when you figure it out.

Will

[ 05-25-2003, 09:54 PM: Message edited by: Liquid Missile ]

I can't figure it out. Called Riva tech line they said it must have been droped or something b4 shpping and its out of wack. Its stamped 13/19 rite on the prop. I'm sending it back to exchange for a new one and starting over. For now the stocker is working fine so its not a mech.prob. Will post when new prop hits the water. Anyone else with input please post because i'm still scratching my head.

Drop
I had Impros fine tune the bend in my 13/19 for my GPR. I know there are others, Carl should be able to help also, that can bend your impeller to suit YOUR pwc.

You want to check your rpms at WOT with the stock prop on a quality tach and then again when you get your 13/19