charging / lacks power in water 150 merc

[gr82fish]

Re: charging / lacks power in water 150 merc

Hi, I'm having the same problem with my 150 v6 merc. The motor loads up with fuel while idling and when you try to go to 1/2 throttle or more it simply does not accelerate. I think the problem is weak reeds as I have tried everything else I could think of. Try this. After warming the engine at idle disconnect the fuel supply and let it run. When it has used most of the fuel in the carbs the engine speed will increase and smooth out (if you have the same problem as mine)just before it stops running. This is what mine does and if I keep it at full throttle long enough it will clear out and take off like a rocket.

 

[Dman]

Re: charging / lacks power in water 150 merc

I have a 60 hp that did the same thing. Try a different prop. Mine turned out to be a spun hub. The motor would not get to planing speed and not accelerate. The RPM's would not even sky-rocket like it should have with a spun hub. Replaced prop and have no problems now. <br />Just a simple solution to frstrating problem and my experience.<br />D

 

[MURX]

Re: charging / lacks power in water 150 merc

Originally posted by Merc115Struggle:<br /> I am having the exact same problem as you are on a 1989 115 HP motor. Mine starts and runs great from 1800RPM down to idle; but it will not get over 2000 to 2500 RPM with WOT. I have read this entire post and am going to check my stator output.

Mine did the same thing it was the "switch box"<br />after replacing fuel pump diaphrams rebuilding carbs stator and rectifier tests I tookm it to thye mercury dealer guy called 45 minutes later and said come get it

 

[wrenchtrnr72]

Re: charging / lacks power in water 150 merc

on the muff it runs and revs like a top fuel dragster. but in water runs like dog #@?!. and i love and have dogs but dont likie dog #@?!, im sorry but i am just mad at this boat motor.

 

[MURX]

Re: charging / lacks power in water 150 merc

Originally posted by wrenchtrnr72:<br /> on the muff it runs and revs like a top fuel dragster. but in water runs like dog #@?!. and i love and have dogs but dont likie dog #@?!, im sorry but i am just mad at this boat motor.

Yep sounded completely normal on the trailer <br />I spent all that money playing parts changer<br />not to mention running around finding parts<br />to find out it was the switch box <br /><br />moral of the story changing parts is expensive now when I have trouble I take to my dealer and ask for a diagnosis and estimate he charges one hour labor for a diagnostic I'm a great mechanic<br />but sometimes I have to call the Man

 

[m_bickle]

Re: charging / lacks power in water 150 merc

Have there been any changes to the boats hull? It sounds like the engine is fine but not able to get up on plane due to another issue. Don't laugh, but how much water is in the hull?

 

[nickantanies]

Re: charging / lacks power in water 150 merc

Hello all I too am having the same problem with my 1988 150 black max. I had it running at 5400 rpms doing about 40 mph, then all of a sudden I just lost power. I had everything in the motor changed before the summer, aka (plugs, impeller, pump, thermostats, not sure about the stator? I have to check. anyone have any Ideas, I am also going to nuts trying to get this thing running right... I tryied making some adjustments in the motor with the idel and the spark screw. Can i have messed up the timming or can the plugs have gone bad already>> anyone have any ideas.<br /><br />Can you also email me at nick1antanies@aol.com and post comments.<br />thanks again.<br />Nick A

 

[nickantanies]

Re: charging / lacks power in water 150 merc

Also is the switch box the same as the stator??<br />thanks <br />nick

 

[wrenchtrnr72]

Re: charging / lacks power in water 150 merc

the boat and hull look like new, no mods and no repairs done. no water coming in boat at all.

 

[1986mariner150]

Re: charging / lacks power in water 150 merc

There is a post here from around april started by KCLOST that covers stator and switchbox tests. I am with clanton and truman lake (stator)but if you search out the post by user name I believe you will find answers to ohming out the ignition parts.

 

[venom]

Re: charging / lacks power in water 150 merc

my first boat did the samething after i took it out of storage 89 johnson motor 60hp ran fine with muffs started fine and idle fine but as soon as i put in the water and tried to plane she was a dog. took it in to the shop they found a jet in the carb that was gummed up real bad replaced jet and she was alive again hope this helps.

 

[wrenchtrnr72]

Re: charging / lacks power in water 150 merc

thanks guy's i am still trying to get this thang going

 

[trumanlake]

Re: charging / lacks power in water 150 merc

16 days have past, and we still don't know anything really about this problem. i think everyone including myself has contributed with information, but we have not heard any results from any of the tests on the stator. or have i missed something? hmmmm

 

[Yarddog]

Re: charging / lacks power in water 150 merc

Check stator by first looking under flywheel to see if black coating around coils got hot and melted some, also use meter and repair manual.Same problem happend to a friend of mine, he told me that a stator has two coils and that the high speed coil burned out but that the low speed coil still worked and that it would idle but not plane out.(cannot be tested on muffs).Let us know how it's going.