Measuring setback properly

[Check85]

85 checkmate starflite
restored/ no bow foam1250 dry
Repowering to a 250 xs TM2

Trying to determine setback.

when determining setback do i measure from the drain plug end of hull to LU nose?

i see alot of discussion regarding the TM2 lower not performing as per incorrect setup and in meed of 16-24” min setback

Looking at pictures. One pic is from the drain plug which is 6” set forward/towards bow from the transom. Second pic is showing the setback from transom to drain plug end of V in hull
So from drain plug to jackplate i have 16”

Currently turning a 21 TRO4 on my 200 xri to 64mph at 6100 is perfect conditions. runs 60 turning 58-5900

IMG_1049.jpeg

IMG_1051.jpeg

[Bryanmc57]

I've always considered setback to be measured from the back of the transom to the front of the transom brackets (or more simply, from the front of the jackplate to the back of the jackplate).

[Check85]

So what your saying is measure the jack plate mounting surface to the engine surface. That would be typical in the sense of when your ordering a jack plate

From what i gather the TM 2 lower needs 16” plus and the measurement is from the pad/end of V in the hull to the front of the Lower unit tip

I feel i will be ok but just wanted to confirm measuring setback correctly

[Savage]

From the FAQ at the top of the forum page........Click on this >>>>> Gen-2 Torquemaster GENERAL setup guidelines

[Check85]

From the FAQ at the top of the forum page........Click on this >>>>> Gen-2 Torquemaster GENERAL setup guidelines

savage. Great to see you poke in on this. I did read that FAQ

im still a little unsure. When referring to a “light hull” would a starflite fall into that category? Dry weight is around 1200-1300. Judging on these bass boats that run Gen2 lowers, and weighing double that i sense im good?

would like to hear from maybe someone with first hand experience regarding the hull

currently the boat drives like its on rails, with the xri. Love it

would like to get some kick back if the gen 2 will cooperate for me.

just want to maintain hole-shot and consistency throughout the power band. really not looking to squeeze out top end, to sacrifice driveability.

if the set up is correct for the gen2, does it behave differently then say a gen 1?

[Savage]

I think you will be fine with the Gen 2 Torquemaster, when you get the height set right. Even if you could somehow gain 10 MPH by switching from a 200 HP to a 250 HP your top speed wouldn't concern me. I like my Gen 2 Torquemaster better than any Gen1 that I have ran.

[EuropeanAM]

Setback is measured from the end of the KEEL in your case, to the nose of the gearcase.

Keel should be parallel to ground (level). Anti-ventilation plate should be parallel to the ground (level).

Then measure from edge just below bildge plug to the nose of the gearcase. That's your setback.

If you would, please take a moment to review the Announcements at the top of the Forum, and be sure to provide the Required Info (serial number) when posting. Thanks!

[Check85]

Don

appreciate the clarification. Always reads more clear when a question is answted directly vs reading in the FAQ����*♂️

So as per my picture, im at 28”, although the motor is not perfectly perpendicular to the ground, from what i can share, it would need to be lowered another 2.5-3”, at least the xri. Which leaves me at 25”ish. Not sure how the pro xs gen 2 will sit, but if its 24” or so now, u think the gen 2 should perform adequately

Regarding my hull weight,1300 dry, stock checkmate starflite, which im probably little less the thn stock, 1200 lbs,
your first instinct , would a gen 2 LU even be a topic of discussion for me?

[Check85]

I think you will be fine with the Gen 2 Torquemaster, when you get the height set right. Even if you could somehow gain 10 MPH by switching from a 200 HP to a 250 HP your top speed wouldn't concern me. I like my Gen 2 Torquemaster better than any Gen1 that I have ran.

Savage, can you elaborate, what do you mean by saying “your top speed wouldnt concern me? What would concern you?

You basically sayin, go for it. Youl love it?!

I think theres more to gain then just 10mph. But as i mentioned the repower is not really for top end, rather gas consumption, and dialing in the boat with a more reliable newer 2 stroke. Seems like it will be getting harder and harder in the years to come to find a 2 stroke with the 4 stroke phenomenon

[Savage]

I would be concerned if the top speed was 90+ MPH. I'm not concerned at low 80 speeds.

[Check85]

I would be concerned if the top speed was 90+ MPH. I'm not concerned at low 80 speeds.

gotcha. Yea i dont see 90 happening

I just know the requirements for this Gen 2 and wanted to confirm i wont experience any of the negatives i have read. That was my reason for posting

regarding Hull weight, set back etc.

I feel I am a candidate for this lower, and will benefit. Just looking for peoples feedback/knowledge

what is considered a “light weight” hull. In terms of lbs?

[blackboat]

let's see the boat!

[Check85]

let's see the boat!

how to post pics?
faq link

[Savage]

how to post pics?
faq link

Go to "General Forums" >>>>>> Help with Boards/Posting/Videos, etc.

[Check85]

Go to "General Forums" >>>>>> Help with Boards/Posting/Videos, etc.

[Check85]

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[Check85]

resizedimage 3.png

[Check85]

let's see the boat!

as requested BlkBoat

[EuropeanAM]

There is a very detailed setup post in the FAQ Section for the Gen-2 TM on these engines. I can tell you that a good starting point will be the 3rd hole and leave jackplate right where it sits. You'll likely only move UP from that point, but it will give you a good starting set of data (provided you're running a suitable prop).

[Check85]

There is a very detailed setup post in the FAQ Section for the Gen-2 TM on these engines. I can tell you that a good starting point will be the 3rd hole and leave jackplate right where it sits. You'll likely only move UP from that point, but it will give you a good starting set of data (provided you're running a suitable prop).

don. Yea im dialing in my setup. Im still wrapped up so im “fudging” my numbers If anything im shootin on the lower side to play it safe

I am trying to get comparison measurements of the XRI lower to the gen 2 lower. Any info on this?
xri serial OG201960
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