1986 mercury 175 black max- WON'T PASS 2000 rpm IN DRIVE!!!

justdrums91 · Feb 27, 2011

well, the motor runs great while idling. but when i put it into drive and get on the throttle, it won't go over 2000rpm. it's not my carb. it's in perfect shape and very clean. i took the carb cover off and sprayed starting fluid into the each of the carb openings while i was on the throttle, but nothing happened. it would have taken off it were a fuel problem. so i did some research and asked around and had a marine mechanic tell me it was the stator. i replace the stator, and the problem is still there. i'm pretty sure it's an electrical problem. any ideas?? could it be my rectifier?? any feedback would be great

SparkieBoat · Feb 27, 2011

Re: 1986 mercury 175 black max- WON'T PASS 2000 rpm IN DRIVE!!!

go to CDI electronics site and download the trouble shooting guide..follow instructions and get needed tools

jigmister · Feb 27, 2011

Re: 1986 mercury 175 black max- WON'T PASS 2000 rpm IN DRIVE!!!

I have the same problem with the same motor. I have a stator on order. The stator ohmed out bad. Also just got the DVA adpater to trouble shoot as CDI says.

justdrums91 · Feb 27, 2011

Re: 1986 mercury 175 black max- WON'T PASS 2000 rpm IN DRIVE!!!

hopefully, you'll have better luck than me with that stator. let me know what happens with yours.

CharlieB · Feb 28, 2011

Re: 1986 mercury 175 black max- WON'T PASS 2000 rpm IN DRIVE!!!

Tho it is NOT recommended to use ether in a 2 stroke, it's a pretty good indication that yours is an ignition problem.

Rather than keep throwing money (parts) at it you need to diagnose the problem.

Start with a simple spark test to see if you have one or more dead cyl's.

Repost your findings then we can proceed.

A DVA meter will be needed to properly test the trigger, stator, and switchboxes.

justdrums91 · Feb 28, 2011

Re: 1986 mercury 175 black max- WON'T PASS 2000 rpm IN DRIVE!!!

we tested all the plugs, and they all fire great.

Mi duckdown · Feb 28, 2011

Re: 1986 mercury 175 black max- WON'T PASS 2000 rpm IN DRIVE!!!

A DVA Meter is needed, And an OEM MERC MANUAL for that motor

j_martin · Mar 1, 2011

Re: 1986 mercury 175 black max- WON'T PASS 2000 rpm IN DRIVE!!!

justdrums91 said:
we tested all the plugs, and they all fire great.

Mi duckdown said:
A DVA Meter is needed, And an OEM MERC MANUAL for that motor

Just because you see a spark on a plug in open air doesn't mean that it'll fire under compression.

Proper diagnostics are the fastest and least expensive path to a repair.

SparkieBoat · Mar 1, 2011

Re: 1986 mercury 175 black max- WON'T PASS 2000 rpm IN DRIVE!!!

j_martin said:
Proper diagnostics are the fastest and least expensive path to a repair.

Amen Brother Martin..well said. Can I use that quote??

j_martin · Mar 1, 2011

Re: 1986 mercury 175 black max- WON'T PASS 2000 rpm IN DRIVE!!!

Of course.

CharlieB · Mar 1, 2011

Re: 1986 mercury 175 black max- WON'T PASS 2000 rpm IN DRIVE!!!

The statoro has two sets of windings, low speed and high speed, it is possible that a high speed winding is weak which will spark test fine cranking yet severly limit power as RPM rise.

HOWEVER, a bad switchbox can also limit power,

THUS, DVA testing all ignition parts to determine the root source of your problem WITHOUT spending a lot of money on un-necessary parts.

wingnut4041 · Mar 1, 2011

Re: 1986 mercury 175 black max- WON'T PASS 2000 rpm IN DRIVE!!!

Those engines were known to have powerpack problems,It can be difficult, sometimes,to determine which pack is bad as they are connected together by a short white and black bias wire that can shift the symptons between the two packs. The safest fix,but not the cheapest,is to replace both packs,because the other one will probably fail shortly after.

wingnut4041 · Mar 1, 2011

Re: 1986 mercury 175 black max- WON'T PASS 2000 rpm IN DRIVE!!!

double posted SORRY

1986 mercury 175 black max- WON'T PASS 2000 rpm IN DRIVE!!!

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