I finally GPS'ed the new boat.

[XClutchboy725]

It could be a worn out "B". I have the same hull. 78 MPH with Mag-bronze Agressor "B" turning 5800.
Going to test with the new Stainless "B" done by Jack next weekend!

[Mr. Crusader 83]

Well the tach was set on number 3 on the back. So i moved it to 4 and we will see tomorrow what the new rpms are.

[flat broke]

If you know what brand and model of tach it is, it's likely that someone on the boards, or one of the many parts retailers could positively identify which setting the tach should be in with a V8. If you don't know the make/model, post up a pic and you still might get some info.
Chris

[HBjet]

71.4 with a stock pump at 6200rpms:jawdrop:
Wow, I have 25mph on that turning 5900-6000rpm on a stainless Berk B with 700+ HP.
I would certainly check the tach, and then check the pump.
Hope it is just the tach.

[ck7684]

But what if it were a "C" or "C/D"??

[Bense468]

Figure 300-400 rpm for each full impellar change (a to B) etc.
Something is still wrong. Like Randy said, he has 25mph on ya and spinning less RPM with a "B". If not tach, your pump will need gone through.

[Mr. Crusader 83]

Heres the results.
I had a good friend take a look at it yesterday.
Tach is 700 rpms off at 3500. So roughly 1000rpms off at 6200.
Timing was only at 25 total degress advanced. So we moved it up to 36. And richened up the carbs some.
It was hard to start before. Especialy if it sat all week. Now it fires right up. I cant wait to take her out on friday.

[Bense468]

Throw a new tach in.

[78Southwind]

Heres the results.
I had a good friend take a look at it yesterday.
Tach is 700 rpms off at 3500. So roughly 1000rpms off at 6200.
Timing was only at 25 total degress advanced. So we moved it up to 36. And richened up the carbs some.
It was hard to start before. Especialy if it sat all week. Now it fires right up. I cant wait to take her out on friday.
So what were Fridays results?:idea: