Barry Grant carb ?
 

What jets does the Demon 825 DP ship from the factory with?

82 - 88 6.5 power valve.

Are you sure? I found the specs for the 850 on the BG site but nothing for the 825. For some reason I was thinking 76/84 or 78/86.

The reason I am asking is I was rejetting my carb an had 72/86's and for the life of me can't remember why I had such a large spread.

I don't know what they ship with, but I know I run 84/92 with 4.5 pv in primary

What mill are you running?

I have bought several B.G. from here. Fast shipping.

http://search.stores.ebay.com/BARRY-...727139QQsofpZ0

I got mine from Dean Gellner 2 seasons ago for a good price.

Blown 565"...so the "BC" ending carbs...

Are you running a secondary PV???? If not, that would be the reason. If you are then thats a big spread.

No secodary PV..

With no secondary PV, you want about a 10 jet size increase in the secondaries. The PV acts like a jet that opens with a reduction in vacuum. With no PV, you need to increase secondary jetting to compensate.

You need a PV in the primaries but not in the secondaries and the way you have it is fine. If you had a PV in secondaries, it would be open anyway as soon as you were into the secondaries anyway. You're just doing the same thing with more jet and no PV.

Ok, I was fouling plugs so I am jetting down to 70's in the primary and 80' in the secondary. I am going to run the boat in the morning and take a plug reading.

I know this is the wrong time of year to jet a carb especially in Houston:angry-smiley-038:I'll deal with rejetting in the fall.

You should be able to get the specs from their website:
http://www.barrygrant.com/demon/default.aspx?page=29

825 is not listed.

Ditto!:(

I am getting some crazy readings on the plugs. 1 and 3 are a little lean 5 and 7 are a little darker than they should be.

2 and 4 are perfect. 6 is lite and 8 is OK.

could it be an air distribution problem with the intake? ZZ502/502 intake.