Need help with no. 6 drives on 42 fountain
 

I need some advice on where the drives should be trimmed at 2007 42 lighting with 700sci and #6 drives when driving? Using the drvie indicator I only go from 6 to start out to 5.5 when on plane. Is this right? I know they don't need much trim any help would be great.

4 3/4 - 5 too much more and the props will blow out.

shouldnt you be at 1 when you take off? drives all the way in

A #6 boat is reversed.

This should give you a starting point. Drives in and tabs all the way down to plane off. I get the most efficiency with the drives tucked all the way in until 3000 with the tabs at 2.5. Come out 1/2 click from 3000-4000 with the tabs at 3, 1 full click from 4000-4500 with the tabs at 2.5 and 1.5 clicks to wot with the tabs at 2.5. Pull the drives in a half point at wot if there is a cross wind.

On the drives indicator all they way down is below the 6 so when you say 1 click do you mean one number?

You have to remember that the drive trim indicators are reversed on a #6 boat. Sounds like that may be your problem. BTW......I have been to Ogden, UT. Very nice up there in the mountains. Where in the heck to run a 42 like that? Sorry, I just had to ask.

correct, 1 click = 1 number from all the way in on the drives and all the way up on the tabs. If yours is like mine, 7 is in on the drives and 1 is up on the tabs.

You can also look at smart craft. They have a digital trim setting if you toggle through the pages. On our 38\700 and 6's shows on the mechanical gauge I dont trim too much over 6, but the smart craft will show 7.4 just a little bit more accurate than the mechanical gauge. They are not calibrated the same, so that can be confusing. Also..the trim on the throttle, up is up and down is down. The individual trim switches on the dash to make the drives go up you have to push what would be normally the down side of the switch.

Thanks for all your comments, it was a big help. aTX427 my boat is set up the same as yours so thanks for the help. FtnDlr we have lakepowell about 5hrs away, flaming gorge 3 hrs away and lake havasu 10 hrs away. We also have a couple small dams close by to play at.Thanks again for the comments.

No problem...so how did it run?

The best I have seen is 104 mph @ 4900 elevation. Still trying out props from hering. Came with 37.5x17 6 blades. Bought a set of 35x17 6 blades, but think I need to go down to 33x17 6 blades. Need more rpm's.

104mph is solid at elevation. I think the 33's will be way too small. There are four 42's with 700's on our lake. Three are running 37x17's. Mine is the odd-ball running 37.5x16.75, which are the same prop's they run on the 850sci boats. You should consider keeping the 37.5's and getting the Whipple ECU / pulley upgrade. It should pull those props another 800 rpm's and the boat will jump on plane.

I already have the whipple kit did that before I bought props. I am only turning about 5300 rpm that is why I wanted to know how much trim to give the boat. I can trim up the boat to get more rpm's but doesn't get any faster, so that is why I think I will try proping down. By the way I put the air tubes on my drives, now it jumps right up on plane. Do you have the drive tubes?

No air tubes here. If you are turning 5300rpm's mid summer, you will probably hit the limiters in the spring and fall. I have not maxed mine out lately, but would expect a 5-8 mph loss mid summer.