1995 Sporster won't start

[Shovelhead]

I started this last week trying to find problem with not starting. Since I have found the 4 wire plug going into mag with a burnt pin I have replace plug but still no ign or a sound from starter. Do I now move on to replacing MPEM??

 

[voodoo]

If you bypass the relay/solenoid and the cranking motor does not turn the problem lies with the cranking motor and/or cabling, many times you get a click from the electrical box but no actual motor turning, follow the wires looking for the voltage drops, tighten anything that is loose - the large black battery wire to the block is most often found loose and corrosion has the effect of loose also.

 

[Shovelhead]

I have checked most of connections and all look good that is how I found the connection going into Mag with Pin burnt.

If I jump solenoid will it start If the MPEM is bad with ignition on. Solenoid is new and had just been replaced, but I can try jumping my friend had done this but plug was bad then.

Thanks for help VooDoo!!

Shovelhead

 

[chipstal]

Same Problem

I'm having the same problem. I get nothing at the switches, but can crank by jumping solenoid. I jumped solenod today with the plugs out and got covered with antifreeze! I'll keep checking back to see how you do, I'm getting desparate and don't want to buy a new mpem.....:ack:

 

[Shovelhead]

Thanks for reply,

I'm working on it from a couple angles now I'm being told the Stator may be bad also trying to figuire out How to check the Stator. I did not have voltage at ignition system last night with key on so I did not try to jump solenoid.

Thanks for help Bill

 

[voodoo]

One thing is certain if you have used a battery charger or a running vehicle connected to overcome a weak battery the mpem has prolly been toasted, I repair radios for the FAA and spent many afternoons working on my kids freinds ski who had done this and after making a lot of substitute circuits to do things the mpem did I finally had to get a new/used one and now we have kill switches with a pigtail to charge the battery after the power to the module has been turned off. The early ignition secondary was a loop to both plugs, so if you are trying to see a spark and the other plug wire is not grounded you will see nothing. on the newer dss type the voltage stays on about 30 seconds to allow some trouble shooting time, then turns itself off and you have to reset the post to make the next test.

 

[Shovelhead]

VooDoo

I'm trying to see voltage at the Coild with ignition on and do not see anything. Talking with seedoo about replacement MPEM he indicates the Stator may also be bad and need to check and wan't sure what to read resistance, ohms or continuity?

I have not jumped only used new battery but was in this condition when I got it.

Thanks again for help

 

[voodoo]

If you just transfer a plug wire to one sitting on top, place the key on and jump the starter relay you should see a spark, the stator is the trigger to the coil/s - there is a light that many marine/motorcycle places have that clips between the plug and the king lead to make this easy. 95 was a year when ignition was changing to the security style, there may also be a spark amplifier in the primary side, you will need the schematic of your system to trace deeper into the spark outage, but if you can see the wires from the front cover and drop a ohm meter there, when you turn the driveshaft there should be some pulsing shown which is the trigger signal on 2 wires - these may be amplified before the coil, again review the schematic slowly, if you follow out to the coil with a signal then the motor will run but you could have a bad mpem box in the area of cranking relay signal or the overspeed shutoff circuit.

 

[Shovelhead]

VooDoo,

Last night with key on I did not have any voltage at the coil it that being delivered by the Stator and I wan not in "Fire" position?

Can I safely Jump a wire to Coil? I was not sure what Fired the Timing if it is Stator as you indicated I thought they had Cols in them I assume for charging, so this even bad would not effect running. I will try what you indicated if overspeed is bad will it still allow it to run or will jumping to coil find this for me.

Dude Thanks for all the help I will work on this week end the fellow at seedoo will be out so I need to send MPEM out to him asap to get repaired before he leaves on extended Vac.

Later My Friend

W.W.Floyd

 

[voodoo]

There are 2 coil sets, one for charge the other is the crank spinning very near TDC so as the crank is turning when the voltage collapses from the windings this is when the spark is to jump - you must turn the crank to have the voltage up-off that is the trigger signal to the primary amplifier or the coil pack itself - if you were to send a random spark to the plugs and there is fuel already involved it could emit one bark so I do not know how to jump a coil as this method has never crossed my mind.

 

[Shovelhead]

VooDoo,

This is how I would jump any other piece of equipment. normally the Mag in this case will develope and send to coil/plugs since this is first Rotax I'm not sure.

I may try tonight, Triumph Spitfires used a ECM however I would switch back and forth to a Point system and remove the ECM. In this case where the MPEM is involved I'm not certain. I got a CD with all the Manuals but my Friend bought it for a 1996 and this is a 1995 which I know some is different. I have matched a few wires but not certain about all of them.

Thanks again.

Bill

 

[JoeZ]

Moving this thread over to the Sport Boat section

 

[Shovelhead]

Thanks

I'm new to this I did not realise there was a section just for the Boat vs the Jet Ski

Thanks.

W.W.Floyd