Black Max 200 bogging wont get over 4900/5000 rpms

[mellowyellow]

Re: Black Max 200 bogging wont get over 4900/5000 rpms

sorry, am a shadetree ... but, isn't 5500 max<br />for '88? what does your manual reccomend????<br />pro's, am I wrong here?

 

[gss036]

Re: Black Max 200 bogging wont get over 4900/5000 rpms

My 1989 200 Merc is a max of 5500, so if you were runing at 6100, way to fast IMO! You should have power trim on the engine, trim it up until you reach hughest RPM and the prop slips (cavatates), the RPM should really jump up, don't let the RPM stay up, you could toast your power head.<br />Did you do anything to change the timing? That could definately affect the top RPM.<br />Could be a bad coil, heat has a way of killing a coil, check for cracks. I had an old Evenrude that would miss bad at high RPM and turned out to be a crack in one of the coils. <br />Also Klost is saying look for exhaust tube, definatly would cause problems, I had a 2 stroke motorcycle that lost about 35% of power and it turned out to be the exhaust tube clogged with carbon. Just my 2cents, not really worth that much.

 

[wilde1j]

Re: Black Max 200 bogging wont get over 4900/5000 rpms

Any chance you're boat is carrying a bunch of water in the bilge? When you mentioned it takes some weight in the bow to plane, that suggests water or some other significant mass in the stern or the motor setup isn't right, but that hasn't changed, right?<br /><br />What boat is the motor on?<br /><br />I would be inclined to follow KCLOST's suggestion and find out what's wrong, rather than throwing parts at the motor and hoping you hit the jackpot.

 

[tommy N]

Re: Black Max 200 bogging wont get over 4900/5000 rpms

Took it to the lake today. Only my 3 year old daughter with me. Boat ran 5200-5400. Checked and found all cylinders firing. Bulb stayed hard. Two exhaust ports on back of engine appear to be in some water. Maybe my jackplate did slip! When boat only ran 4900 last week it had three adult men. But this still isnt the 5800-6100 I ran last year. Could it be the jackplate??? thanks again

 

[tommy N]

Re: Black Max 200 bogging wont get over 4900/5000 rpms

Wrench now thinks it might be timing module not allowing the extra rpm. Something to do with 26 degrees.

 

[mellowyellow]

Re: Black Max 200 bogging wont get over 4900/5000 rpms

ARE YOU READING REPLIES?<br />max rpm's is 5500 for your motor, I don't care<br />if you ran it 5800-6100 last year. exceeding<br />this will burn up the motor. do you have a manual?<br />is the cavatation plate even with the bottom of<br />the hull? stop forking out money for parts you<br />don't need dude!

 

[KCLOST]

Re: Black Max 200 bogging wont get over 4900/5000 rpms

Now it's a timing module????????<br /><br />I believe when the triggers were replaced that timing and sync. were required at that time....<br /><br />It sounds to me like you are getting screwed...<br /><br />But Mellow is correct, your rpms sound fine...

 

[arboatdr]

Re: Black Max 200 bogging wont get over 4900/5000 rpms

I believe what you are saying is that last year you could turn 6100 max rpm and this year you only turn 5400 rmp but haven't changed a thing. You do have a problem and need to keep trying to figure it out. Once you do you need to get a different prop because what you were turning last year is a bit high. If the advance module is in question simply disconnect it, run the engine and verify top end timing. If it perks up and runs like it did then problem solved. If not, don't waste your money buying one just to see. Engines don't just lose 700 rmp in a year without a problem. Keep digging and you will find it.

 

[tommy N]

Re: Black Max 200 bogging wont get over 4900/5000 rpms

Thanks for the replys. Some of you may be taking this a little personal. Good cuz I need the help. HAR. I called merc and they said max is 5800-6000. two times ago out with 3 adults it did miss and jump rpm but could only get to 4900. Wednesday out it didnt miss and I tried to make it miss and it got to 5200 with only me and my 3 year old daughter. I even replaced the older plugs back into it and then it would die as I put it in gear. Those older plugs are less than 6 months old and arent fouled. I gotta believe something just isnt right since it has ran higher in the past. Keep giving me suggestions to look at. Im listening and testing and learning. Fuel doesnt appear to be the culprit. I did what you asked Kclost and bulb stays hard. mellowyellow, something just isnt the same. Boat ran better before so the rpm issue is just how Im trying to explain it best i can. arboatdr, I will try the advance module any other symptoms that could produce.

 

[mellowyellow]

Re: Black Max 200 bogging wont get over 4900/5000 rpms

not personal at all buddy <br />look at position of motor and get back to us.<br />really thought 5500 was max, but glad u did homework.<br />jackplate maybe culprit?<br />just a firm believer in starting with the basics<br />is all...<br />good luck and keep posting!<br />M.Y.

 

[tomoad]

Re: Black Max 200 bogging wont get over 4900/5000 rpms

i have the same motor and the same problem 5200 rpms is all i can turn, and the 200 is on a little 17'6'' boat at 1000lbs, jackplate all the way up, i have a low water pick up.. turning a 26 chopper, i've tried everything, i wish you would find what the problem is so i can fix mine..

 

[KCLOST]

Re: Black Max 200 bogging wont get over 4900/5000 rpms

tomoad,<br /><br />If you put a 24p prop on that baby you'll be running 5600rpm at WOT.... You could be over propped with a 26...

 

[tomoad]

Re: Black Max 200 bogging wont get over 4900/5000 rpms

no i don't think its over proped with a 26.. ive known 3 other people that had same boat and motor and they ran 28 choppers no problem at 6200 rrr's tommy n i beleive me and you have the same problem. i also think we have lost an cylinder, whichone??? i beleive the coils need replacing, at least thats what i am going to do is change the coils

 

[restretch]

Re: Black Max 200 bogging wont get over 4900/5000 rpms

Hey, I had the exact same problem with a 1992, 200hp, mercury black max. I replace everything (trigger, stator, ect.) I cleaned the carbs twice, had the lower unit rebuilt, changed sparkplugs five different times, switched out all my fuel lines, had the tanks cleaned, and tried several different props. When I finally found a mechanic that knew what he was was doing it got fixed. We decided it was one of two things. Powerpacks or fuel pump diaphram. In my case it was the power packs, by the way my old powerpacks tested fine just as yours did. He changed them out and it runs awsome. Finally, he told me that if I was having proplems while running a w.o.t. that my diaphram would have been the problem. Don't spend the 3,000.00 I spent on parts changers. Find a Good mechanic and stay with him.

 

[tommy N]

Re: Black Max 200 bogging wont get over 4900/5000 rpms

Found my rpms. They were hiding in a throttle adjustment that needed to be made after I had the carbs rebuilt and installed a hot foot. <br /><br />NEW PROBLEM.. Enigine is now dieing every time I put it in gear, forwarrd or reverse. thanks again for all your help. Ive learned a ton on this forum

 

[arboatdr]

Re: Black Max 200 bogging wont get over 4900/5000 rpms

Glad you found the problem. That info about installing a hot foot might have been helpful to know in the begining. Unfortunatly some assumptions were made that weren't quiet right. We assumed that the problem just manifested itself instead it looks like it was created by the hot foot installation. Lesson learned: Never assume anything. Did you find the problem or the mechanic? Might want to check your cable agian. It could be binding the lever towards idle retarding the timing just enough to make it want to die. Good luck.

 

[quantumleap]

Re: Black Max 200 bogging wont get over 4900/5000 rpms

Oh geez!! 34 posts before he mentions he changed the method of acceleration on his boat!?!?

 

[tomoad]

Re: Black Max 200 bogging wont get over 4900/5000 rpms

good for you, but bad for me, mine still not fixed,

 

[tomoad]

Re: Black Max 200 bogging wont get over 4900/5000 rpms

tommy set your idleing up,and try