FWIW - I think that is sort of true. The NGK's were really good but for a shorter peroid. The Delco's were almost as good but lasted longer.

But I also drive around on one engine!:lolhit:

Well, I think we are making progress.....the boat was water tested on sat and the leak seems to be fixed....I guess it was some kind of gasket that had to be made on a water inlet line that goes through the box....I didn't see it but he says it is fixed now.



Problem #2....I guess the boost pump was bad....the fuel pump can keep up under 3000 RPM but needs the boost pump after that to help supply fuel? I am not an expert on these things but that is what the mechanic is telling me. No power to the boost pump so he is going to change it....$250 for the pump...ouch..but at least we are making progress he said it should be done tue or wed as he had to order the part.

Glad to hear you are moving forward...best of luck!

250.00 is a cheap fix on a boat any day. Boating season is too shot to not be on the water.

there was a guy on here from overseas germany that had the 25ol that ran nice with a imco 3'' raised box and 525 went from 74 to 81, then he added a merc 600 sold the 525 and ended up with 4'' altogether 3'' raised box 2'' shortie with a 1'' spacer at final test of 87 or 89gps. good luck

any new progress???

I am going to pick it up in an hour.......we'll see.

All fixed !! It ended up being the boost pump that was bad. Also the leak in the ext box is fixed.

I took it out for a test run today and noticed the speedo was not working and had no GPS with me so no numbers for you. I measured the distance from bottom of pad to prop centerline.....3"......I had a M+ 23P on boat and zero issues getting on plane. Before the box, it would take a little distance to get the boat to 5000RPM where it would max out, now it gets there quick with a little blow out around 4000-4500 RPM's. I am now on the rev limiter quick with this prop.

Next time out (Thursday) I will have the GPS and a 24P B1 Labbed. Any guess on what to expect? It was 63 MPH at 4600-4700 RPM and took a bit to get the 4700 and maybe 64 MPH. I suspect I will be close to 5000 RPM's or over now.

Very glad to hear you have it sorted out! Keep us posted!

24p at 5000 rpm I'd say 68 gps to 70 gps, good luck.