the big question

**Buzzin half dozen** · 02-25-2021, 08:49 PM

Whats the difference between a mercury 150 and a 150 black max xr2? has anyone ever dynoed a 150 xr2 whats the power at the prop?
thank you and god bless your souls

**LakeFever** · 02-25-2021, 09:05 PM

It depends on what year 150. The 150’s came in 2.0, 2.4, and 2.5L sizes. The XR2 is a 2.0L that was sold for a coupla three years in the late 80’s. Compared to a 150 black max 2.0L of the same vintage the XR2 came with a few upgrades; bigger carbs, better tuner and plate, and a few other doo dads. The XR2 made around 160hp maybe a bit more. I had a 2.0L that I ran for one year, great motor. I still have an XR2 I have yet to run

**KIRCHNER** · 02-26-2021, 04:24 PM

Originally Posted by LakeFever

It depends on what year 150. The 150’s came in 2.0, 2.4, and 2.5L sizes. The XR2 is a 2.0L that was sold for a coupla three years in the late 80’s. Compared to a 150 black max 2.0L of the same vintage the XR2 came with a few upgrades; bigger carbs, better tuner and plate, and a few other doo dads. The XR2 made around 160hp maybe a bit more. I had a 2.0L that I ran for one year, great motor. I still have an XR2 I have yet to run

i have a 83 150 2.0, looks like it just came out of the crate. ran 65 on a shadow bb.

**Capt.Insane-o** · 02-27-2021, 07:18 AM

xr2 had the 200 tuner and larger carbs, great little motors.

**Muskoka2** · 02-27-2021, 10:12 AM

Originally Posted by Capt.Insane-o

xr2 had the 200 tuner and larger carbs, great little motors.

So what's the diff. with my Daughter's '02 150 XR6?

**David** · 02-27-2021, 10:48 AM

XR6 was a 2.5L, XR2 was a 2L. More cubes meant more torque. The XR2 had the standard gear case, 2:1 gears. The XR6 could have the standard gear case with 1.87 gears, or the smaller 4.25” gear case with 1.78 gears.

**XstreamVking** · 02-27-2021, 11:13 AM

Probably wrong, but didn't the XR bass motors come with a timing adv. box that gave a few degrees more above 5700-5800 rpms?

**David** · 02-27-2021, 12:14 PM

I had an XR4. It had a timing box that retarded the timing to limit HP. I don’t know if the XR6 was the same. If it matters, the XR4 was 2.4L

**Muskoka2** · 02-27-2021, 11:38 PM

Originally Posted by XstreamVking

Probably wrong, but didn't the XR bass motors come with a timing adv. box that gave a few degrees more above 5700-5800 rpms?

I believe my Daughter's '02 XR6 shows a 5,800 r.p.m. red line!

**LakeFever** · 02-28-2021, 05:33 AM

XR2’s sound nasty, one of the meaner sounding stock fishin motors

**Muskoka2** · 02-28-2021, 08:43 AM

Originally Posted by Muskoka2

I believe my Daughter's '02 XR6 shows a 5,800 r.p.m. red line!

Correcting myself-5,600 r.p.m.!

**David** · 02-28-2021, 11:36 AM

When I had my XR4 on my SS2000, it would not pull more then 6000 rpm, even with a 24” prop

**tlwjkw** · 03-01-2021, 03:39 AM

Originally Posted by Muskoka2

Correcting myself-5,600 r.p.m.!

makes no difference with that motor.. its a new and improved "lectronic" motor that ya have no control over.............

**David** · 03-01-2021, 10:26 AM

It was possible to remove the timing box and get more rpm out of an XR4. Was the XR6 the same?

**tlwjkw** · 03-01-2021, 11:15 AM

after lookin' inside tha xr4 block decided it wouldn't be worth it... had a coupla "switch box" xr6's that could easily turn up 65/6800 plus (whatever tha stock portin' would give up).. lite weight boat, little prop, 2 ta one's and jacked up a bunch..