MERCURY TECH: mercury black max 150 PROBLEMS

[magump]

I HAVE 1986 MERCURY BLACK MAX XR2 150 ON MY FISHING BOAT. WHEN THE MOTOR IS COLD I HAVE FIRE ON 1,2, BUT NO FIRE ON 3,4,5,6.TAKE A BLOW DRYER AND WARM MOTOR UP SOME AND U WILL GET FIRE ON 3,4,5,6 AND MOTOR WILL START,AND AS LONG AS U KEEP THE MOTOR WARM BY STARTING EVERY SO OFTEN THE MOTOR WILL START AND RUN GREAT.IF U LET MOTOR GET COLD AND NO FIRE ON 3,4,5,6 AND MOTOR WILL NOT START. ALSO 2 MONTHS AGO BOAT WOULD NOT PLANE AND HAD NO POWER,ENDED UP REPLACING STATOR AND THE POWER CAME BACK BUT STILL HAD COLD ISSUE. PLEASE CAN SOMEONE HELP. God bless mac

[tlwjkw]

has it always had tha cold start issue (even before you found the 'lectric problem) since you have owned tha motor?

[W2F a V-King]

What part of the motor are you warming up with the blow dryer?

[johnboy 88 vegas]

This is kinda backwards to the usual problem of when it gets hot it loses fire.....new one on me. Like WTF a V-King said what the heck are you heating up on the motor?...carbs? trigger? coils? fuel pump? block itself?

[tlwjkw]

post number 2 ???

[magump]

always had a cold start issue, and I would take the motor cover off on the left side and wedge the blow dryer in the right side of the cover, this heats up the side with switch plates,rectifer,and most of your wireing. about 2-3 minutes with blow dryer and 3,4,5,6 would start firing.

[tlwjkw]

whats your "cold start" procedure?

[magump]

pump ball til solid, turn key 1/2 way and prime carbs by pushing key in 4 times. turn key to start. never starts, so I take blow dryer and blow dry motor for 2 to 3 minutes, and try again. if motor tries to start I know that it warm enough and keep doing this till it starts. if it doesn't try to start I do blow dryer a little longer, and repeat. takes a few times then starts and onces it starts and run a little bit u can shut motor off. if motor stays warm it will start with just a quick turn of the key, couldn't ask of a better running motor then. just don't know if it is the power packs, rectifier, trigger and these parts are not the cheapest just to be guessing.

[tlwjkw]

try this....
pump bulb.
trim ALL tha way in.
push key and hold while tryin' ta start. might start but will at least belch, fart or TRY ta start. let off key completely.....
trim to level, raise fast idle ever so slightly
hit start without key pushed... should start, if not bump enrichner again while tryin' ta start...

it takes a lotta gas ta start a cold merc... don't be scared!

[magump]

I will try this, but how is this going to get me fire on all cylinders when cold?

[Capt.Insane-o]

Buy a dva meter and learn how to use it.

[W2F a V-King]

" No Fire"... Guessing you actually have no spark when cold? Just clarifying?
Mercury's enrichment circuit does not fuel cyl's 1 &2, just 3456. It pulls fuel from carbs 12 then gravity feeds it to 34 56 carbs.

A DVA ^^ ( Digital Volt Amp meter ) will allow you to test the output of the suspected switch boxes to the coils in question 3456. If you have a Mercury Shop Manual it will give you the sequence of this test. If you don't have one PM me and I'll scan the page's out of mine, and send it back to you.

Or maybe someone has a shop manual in a PDF for him?

HTH


James H.

[magump]

i don't have manual.

[W2F a V-King]

i don't have manual.

PM sent with video link.

You don't need Mercury's DVA direct voltage adapter to test this. Some DVOM's have the function built ( peak voltage function ) in. My fluke 88 has it built in.



HTH

James H.

If yours does not eBay has the aftermarket ones that plug in between your DVOM and the test leads.

http://www.ebay.com/sch/i.html?_nkw=direct+voltage+adapter