78 200 20hp electrical or timing?

[twindad01]

Just got this 78 merc 200 was runnin great then after I hooked up remote controls it started messing up took off remote still messing up. It kicks back trying to start some times and at low speeds or idel just shakes and quits with a bang or like something got jammed in it after some looking it seems the what i think is timming advance affects it. Any clues or help for me?

 

[Gibbles]

Re: 78 200 20hp electrical or timing?

Things off of the top of my head that can cause it.

Sparkplugs, idle to low, timing, short in wiring, and loose connections.

 

[twindad01]

Re: 78 200 20hp electrical or timing?

Going to try new plugs tomorrow my local guy thinks its carb. Took off carb it's clean as can be and looks like its brand new. I don't know any thing about adjusting carb or idel runs great at high speed. Just misses like crazy at idel and shakes all over the place wires all seem good and tight. I have a video of it running but don't know how to up load it or where to up load it it's very frustrating. If you touch or slightly move that timing advance linkage it dies. Some times when you try to restart it it will yank the rope right out of your hand!! Ouch lol

 

[twindad01]

Re: 78 200 20hp electrical or timing?

Oh yea the mixture screw the one in front is about 1 3/4 screwed out?

 

[twindad01]

Re: 78 200 20hp electrical or timing?

Here is a link to the video of this motor messing up
http://www.youtube.com/watch?v=Sz--Eo2n4Jk&feature=youtube_gdata_player

 

[Gibbles]

Re: 78 200 20hp electrical or timing?

I'm going with what can go bad in a season, or what can get messed up when connecting the remote controls (I have two of these outboards).

timing is a big one if anything was changed, and I had an issue with old plugs that looked fine, but it would give a pop and turn off
new plugs and it ran like new

old fuel is another one...

 

[twindad01]

Re: 78 200 20hp electrical or timing?

Has a few people tell me it's the low idle jet or screw thing putting in new plugs they are really wet going to clean out carb even though it's as clean as a new one would love to see some pics of how your remote cables are hooked up and if you happen to have a fly wheel and starter for one laying around lol

 

[Gibbles]

Re: 78 200 20hp electrical or timing?

I have a bunch of parts laying around, currently they all have a place to go...

remote hookup

 

[Gibbles]

Re: 78 200 20hp electrical or timing?

You also need cables of the Mercury 600a type
teleflex and uflex offer some good choices

 

[twindad01]

Re: 78 200 20hp electrical or timing?

Had the local guy finally take a look at it and he seems to think I needs a fly wheel. Something about they can slip inside where the magnets go and it's throwing the timing way off said could be a trigger too but feels more towards fly wheel there is a mark or gouge in it but can't see where anything hit it so now I need to try and find a fly wheel cheap

 

[Gibbles]

Re: 78 200 20hp electrical or timing?

Had the local guy finally take a look at it and he seems to think I needs a fly wheel. Something about they can slip inside where the magnets go and it's throwing the timing way off said could be a trigger too but feels more towards fly wheel there is a mark or gouge in it but can't see where anything hit it so now I need to try and find a fly wheel cheap

ebay
Here is an electric start\pull start one for $40
http://www.ebay.com/itm/Mercury-200..._Accessories_Gear&hash=item1c28175fe1&vxp=mtr

 

[Chinewalker]

Re: 78 200 20hp electrical or timing?

The sparks that showed up in the video are definitely pointing to ignition. The only way spark can show outside of the plugs is if you've got a hole in the system for it to arc through. Any evidence of cracks in the coils? Wiring? Switchbox?

I don't think it's your flywheel. Unless the magnets have broken and "shifted" in their placement on the rim, there's nothing that can really go bad - and you'd see it if the magnets had come loose. And if it was the crankshaft/flywheel key, it would simply shear and you can replace it in about 15 minutes. Nothing else to go bad, and the motor likely wouldn't run if they were loose enough to need replacing.

 

[twindad01]

Re: 78 200 20hp electrical or timing?

Gibbles this looks nothing like mine not sure if t would work. Mine is a 1978. Chinewalker I don't see any signs of the magnets moving or moved but if you find where they switch polarity and I marked the spots when they line up with the trigger the timing mark is way off from where it should be. I do see a gouge in the flywheel right close to where it changes this runs good except at low idle and carbs been cleaned and checked the guy said he feels it's a def timing issue. Wish I new how to post pics on here. I was wondering if at some time some one may have put the wrong fly wheel on it? There are no numbers on it anywhere. I see no sign of arcing but I might put it back together and run in dark to see I there are any sparks showing. I think what showed in video was my porch light reflecting off the shiny top cover

 

[twindad01]

Re: 78 200 20hp electrical or timing?

Just found a bad wire the brown wire from the cdi modual ? Is cracked and green where it goes into modual and another spot further down is bare and green this brown wire and white one beside it goes right to the trigger I think this might be it and it's the original box according to the date on it. I hope it's available an reasonable priced any thoughts?

 

[Chinewalker]

Re: 78 200 20hp electrical or timing?

Definitely have to fix that. New power packs are available, but not cheap.

Regarding the timing - does it appear that at any time someone may have removed the flywheel from it's hub? Do the bolts on top of the flywheel show wrench marks? I had one once that would show spark but would backfire. Checked, rechecked, and re-rechecked everything in the ignition wiring, etc. and couldn't figure it out. Wasn't until I checked the flywheel against another that I realized the magnets were in different positions in relation to the keyway in the hub. Someone had removed the outer rim and plate from the hub and didn't get it back on in the same position, throwing off the timing.

 

[Chinewalker]

Re: 78 200 20hp electrical or timing?

Sorry - double post...

 

[twindad01]

Re: 78 200 20hp electrical or timing?

I've looked it over pretty good but will double check that I am kinda hoping it's the cdi the wire that's bad goes to the trigger and when you would try to mess with the timing advance or any part of its linkage at low idel that's when it would quit. I am going to see if the local guy has one that way I can try it I really hope this works

 

[Gibbles]

Re: 78 200 20hp electrical or timing?

I would suggest seeing if you can repair the wire some how

If not, check ebay.

Also my one engine I setup the remote control is a 1977

possible your missing the remote brackets...

post up some pictures of the tiller handle side of the engine.
on that side should be for the throttle, and on the other side where the shifter is, there should be a bracket that can accept the plastic cable end.

When I first got my engine I made my own controls with a random cable buy at the marine store, and used stainless wire to attach the cables...

it worked fine, but when I finally saw how it was supposed to mount It was all backwards from the way that made most sense to me.

if needed I'll get some full resolution pictures posted (as a link)
Note that the engine is currently in storage, and the cables are not connected...

 

[twindad01]

Re: 78 200 20hp electrical or timing?

It was the wires I used liquid electrical tape and now no missing or stalling idels down now too going to test run it in the water Lil later today then back on the pontoon with the remote set up and test again. I think I've finally got the remote set up fixed my problem was the shifter cable I had bought a Clevis thing and it was offset and was to wide to fit in the cover so I used a # 80 master link and it works good. I didn't have a problem till I hooked up cables so I think I agrivated that bad wire when I was tweaking and putting the cables on if it runs ok I'm going to snag a used cdi off eBay for a spare cause it's probably only a matter of time before it fails

 

[twindad01]

Re: 78 200 20hp electrical or timing?

Well ran good for a lil while then acted up agian but not as bad as before. Thought it might have got hot let it cool for a cpl hours while fishing but still acted up as soon as I started it. I pulled the cover and wiggled the wires started it and it ran ok or better I feel if I replace it it will run even smoother