egreen024
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Registered: 02-2006
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Mercury 150 xr6 rpm problem
I'm running a renegade prop 13 1/2 x 23 4 blades, I notice that running at 5800rpm motor sounds as if it is running at mid range rpm, so I kept pushing throttle to see what kind of rpm I would spin at WOT and to my surprise it goes all the way up to 6600rpm!!!!. Now, I didn't let it stay there long to get MPH at 6600 cause I didn't want to brake anything, but at 5800 is doing 50 mph, but like I said you can tell motor is just somewhere at mid range. (can tell by noise) I remember that when I had the evinrude I moved a dial behind the tac, not sure if I put it back on merc settings, hope this is the problem, what's the # that dial should be at? believe there's 3 settings. Once I know the rpm's are true I can find out the wot rpm's and fixe or buy new prop for it, hopefully wityh more mph. 
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Apr/17/2010, 8:50 pm
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Bullet20dc
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Registered: 09-2004
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Re: Mercury 150 xr6 rpm problem
must be a tach setting cause your motor aint turning 6600 rpm without shredding. next time you have it over to my shop remind me to compare your tach reading to my test tach
I forgot your old motor was an OMC before you came over to the dark side. I believe the switch should be on position 4 if it has one. 12 pole ... what does it read at idle.
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Charlie B
Bullet20dc / 250XS
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Apr/18/2010, 6:20 am
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JEVPhoenixBass
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Registered: 04-2010
Location: SW Missouri
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Re: Mercury 150 xr6 rpm problem
Let us know what you find out. I've never seen that situation before and am very curious.
Thanks...
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Pro Staff: Phoenix Bass Boats, Humminbird, MinnKota, Navionics, Luck-E-Strike, Ardent USA, StayNCharge, Grandt Rods, BassWishes Tackle.
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Apr/18/2010, 10:33 am
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egreen024
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Registered: 02-2006
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Re: Mercury 150 xr6 rpm problem
Ok here's what I found: I try to describe it the best I can.
This is a small plastic dial with an arrow on it pointing to numbers on the outside of dial, so let's picture a clock.
C=CYL (this is written on back, got no idea
what it stands for)
P= pulses
bottom side at 6 o'clock there's a 2P and under the 2 is a 4c
at 8 o'clock theres a 3p & 6c
at 10 there's a 4p8c
at 12 there's a 5p
and at 3 there's a 6p My setting right now is pointing to 6p which is the highest on the dial, so gonna move it to 4p/8c
I notice that last time I shot off engine rpm needle stopped at 1500 rpm's,
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Apr/18/2010, 1:22 pm
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dougw
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Re: Mercury 150 xr6 rpm problem
Try moving it to the 3p/6c(the 8 O'clock position). The 4p/8c is for 8 cylinder engines - yours is a 6 cylinder.
The tach is set up now for a 6 cylinder delivering 6 pulses. Or really any engine sending 6 pulses per revolution. I would think the current setting is the correct one and the tach is just goin' belly-up!
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Apr/18/2010, 9:45 pm
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Bullet20dc
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Re: Mercury 150 xr6 rpm problem
quote:
egreen024 wrote:
Ok here's what I found: I try to describe it the best I can.
This is a small plastic dial with an arrow on it pointing to numbers on the outside of dial, so let's picture a clock.
C=CYL (this is written on back, got no idea
what it stands for)
P= pulses
bottom side at 6 o'clock there's a 2P and under the 2 is a 4c
at 8 o'clock theres a 3p & 6c
at 10 there's a 4p8c
at 12 there's a 5p
and at 3 there's a 6p My setting right now is pointing to 6p which is the highest on the dial, so gonna move it to 4p/8c
I notice that last time I shot off engine rpm needle stopped at 1500 rpm's,
here is a breakdown to better understand the
tach settings
2p 4c = 2 pulses for 4 cylinder motor
3p & 6c = 3 pulses for 6 cylinder motor
4p 8c = 4 pulses for 8 cylinder
5p = 5 pulses never used that one
6p = 6 pulses for 6 cylinders
6p is where ya want to be at Doug may be right you're tach is messed up or the voltage regulator is screwed up.
In the back of the motor there are 2 grey wires. One for each regulator . One will have a wire in it ( the tach lead) the other will be empty or have a black plug in it. Take the lead from the tach lead from one and stick it in the other.
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Charlie B
Bullet20dc / 250XS
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Apr/19/2010, 6:31 am
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