Merc Sportjet 120 No spark

[jetdriven]

Re: Merc Sportjet 120 No spark

I don't think so. If you have a red stator (made by mercury) in there now, you will need an adapter to hook it up to the switchbox. <br /><br />If your "red" stator from seiler is not made by mercury, I think that you should talk to seiler and ask them whether or not an adapter goes between the switchbox and their stator.<br /><br />You can see a picture of the red stator and red stator adapter on a number of sites, one that's not too hard to navigate is www.stemtostern.com.<br /><br />If I understand you correctly, the photo of the stator in your hand is your old stator, right?<br /><br />Kenimpzoom: what do you think?

 

[jetdriven]

Re: Merc Sportjet 120 No spark

Tony, you wrote: "...bound together with a 3 cyl label on it."<br /><br />3 cylinder?<br /><br />You have a 120 hp, 4 cylinder engine, right? Did they give you the wrong stator?

 

[tonym302]

Re: Merc Sportjet 120 No spark

Sorry Jet, let me clarify<br /><br />1. pic of stator is the brand new one from Seiler.<br />2. Old dead stator in boat now is a red stator from mercury. As well as the adaptor box.<br />3.The 3 cyl label on there can be seen in the stator pic

 

[kenimpzoom]

Re: Merc Sportjet 120 No spark

I would call seilor and ask them if this is the correct part. I am not sure if there is a difference between three cylinder and four cylinder. Also, your wires are completley wrong.<br /><br />Did this thing come with instructions.<br /><br />I can't tell you which wires go where as I have never seen a stator like this.<br /><br />Ken

 

[tonym302]

Re: Merc Sportjet 120 No spark

Ok guys,<br /><br />I talked to Seiler and got things squared away. It appears the 3 cyl sticker on those wires is there for info. If I had a 3 cyl, i would have to ground those wires. Since I have a 4cyl, I have to remove that red stator adapter, and hook it up like the factory did. Thanks for the help

 

[kenimpzoom]

Re: Merc Sportjet 120 No spark

Thanks for the info Tony. The guy at seiler is pretty helpful. Let us know how the Rapair stator works. I have a Rapair switchbox right now, and I am sure my red stator will fry itself someday. Good of Rapair to eliminate the red stator adapter, just one less thing to fail.<br /><br />Ken

 

[tonym302]

Re: Merc Sportjet 120 No spark

Ok ken, i removed the old red stator and adapter. Put in the new stator and wired it up. Reinstalled and torqued the flywheel. Popped a plug wire to check for spark. the wire wouldnt sit right and i could get optimal ground for the spark to jump. So being the dummy that I am, i reach out to hold the wire. Turn the key, it sparked, and them jumped to my finger. All i can say is dont get hit by a seiler stator. Hooked the wire back up due to spark. ok, now on to starting it. Turn the key, no start. Gave her a quick shot of eyther down her throat, and she jumped to life. It runs, and will get the maiden test voyage tomorrow. Another quick thanks for your help.

 

[kenimpzoom]

Re: Merc Sportjet 120 No spark

Nothing like some good high voltage fun to wake you up!!! <br /><br />BTW, be sure to try to always have a good ground when checking for spark. If the spark cant go out the plug wire, it will ground out in the switchbox and fry itself in the process.<br /><br />Good to hear it is running.<br /><br />Ken

 

[tonym302]

Re: Merc Sportjet 120 No spark

OK, more issues.... I had it out for 45 mins, and it ran like a champ. It bogged coming once through a No Wake zone. and then died... It has no spark once again... I am leaning towards the trigger now, but I will test the stator to make sure it isnt faulty.

 

[jetdriven]

Re: Merc Sportjet 120 No spark

Check to make sure that the rev limiter is not at fault. That test is easy...just unplug the black with yellow striped wire from the rev limiter. Also, check to make sure that none of your wiring connectors came apart. This can happen. <br />Lanyard kill switches can go bad, also.

 

[kenimpzoom]

Re: Merc Sportjet 120 No spark

If it isnt stator or trigger or wires/switches, then it is the ignition box. About 130 bucks from Seiler.<br /><br />Totally isolate the kill circuit by unplugging the black/yellow stripe wire from the ignition box. If it runs again, somewhere along the wire it is grounded or a kill switch/key switch is bad. (P.s. to kill the engine now, ground that wire out and that kills the motor). Also check for battery voltage on that wire in all key positions, there should be zero volts. If any volts are present, it will fry the ignition box.<br /><br />Ken

 

[tonym302]

Re: Merc Sportjet 120 No spark

The ignition box is brand new from Seiler. The only original think left in the boat is the rev limiter, and the trigger. Stator, cdi (?), and ignition box were changed. Coils are original but I do not think this is the issue. When stranded, i unplugged the black/yellow striped wire and it still had no spark.

 

[kenimpzoom]

Re: Merc Sportjet 120 No spark

First check you stator again. Stranger things have happened.<br /><br />Its easy to check the trigger. Check the ohms between the white wire (or is it the white/black stripe wire, my memory fails me) and all the other wires. I think it should be 800-1200 ohms.<br /><br />Dont have my manual in front of me, so hopefully someone will confirm this.<br /><br />Ken

 

[tonym302]

Re: Merc Sportjet 120 No spark

Ken, <br /><br />I checked the wires on the trigger and I only get resistance between the white/striped and brown, and then the white and violet wires. I tried all combos and these are the only 2 combos that give resistance. Did I do this correctly?

 

[kenimpzoom]

Re: Merc Sportjet 120 No spark

I forgot to look in my manual last night. Will try to look tonight. It would be a good idea to purchase one yourself as these boats will continue to have problems. Just search for "sport jet" on ebay and there is always one for sale. Or try iboats.<br /><br />Basically the trigger is just like four stators in one housing, except it is very low volts. As the flywheel spins it induces volts in one of the trigger coils at the right time and that tells the ignition box when to spark the sparkplug.<br /><br />One wire is common to all four coils on the trigger. I thought it was the white/blackstripe wire, but dont remember. Then there are four other wires, one white, one violet, and two I dont remember.<br /><br />Ken

 

[tonym302]

Re: Merc Sportjet 120 No spark

Thanks again Ken. I purchased the manual last night from Ebay. My trigger only has 4 wires coming from it. white, white/striped, brown, and violet

 

[kenimpzoom]

Re: Merc Sportjet 120 No spark

Hmmm, thats weird. I thought there is five wires from a 4 cylinder trigger. There is only 4 from my 3 cylinder trigger.<br /><br />I'll look in the manual tonight.<br /><br />Ken