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Thread: the big question
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02-25-2021, 08:49 PM #1Junior Member
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the big question
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
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02-25-2021, 09:05 PM #2
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
Hydrostream dreamin
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02-26-2021, 04:24 PM #36000 RPM
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02-27-2021, 07:18 AM #4
xr2 had the 200 tuner and larger carbs, great little motors.
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02-27-2021, 10:12 AM #55000 RPM
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02-27-2021, 10:48 AM #6Team Member
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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.
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02-27-2021, 11:13 AM #7Screaming And Flying!
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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?
83 V-King, 96 Mariner, 200 hp ff block 2.5 w/a 28p choppa
We gotta clean this liberal mess up, VOTE TRUMP TO MAGA!
Rebuild thread:
http://www.screamandfly.com/showthre...-it&highlight=
http://www.screamandfly.com/showthre...cs.&highlight=
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02-27-2021, 12:14 PM #8Team Member
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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
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02-27-2021, 11:38 PM #95000 RPM
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02-28-2021, 05:33 AM #10
XR2’s sound nasty, one of the meaner sounding stock fishin motors
Hydrostream dreamin
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02-28-2021, 08:43 AM #115000 RPM
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02-28-2021, 11:36 AM #12Team Member
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When I had my XR4 on my SS2000, it would not pull more then 6000 rpm, even with a 24” prop
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03-01-2021, 03:39 AM #13
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03-01-2021, 10:26 AM #14Team Member
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It was possible to remove the timing box and get more rpm out of an XR4. Was the XR6 the same?
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03-01-2021, 11:15 AM #15
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..
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