lose spark at 1/2 to full trottle

M

markscat

New member
Hello I have a 1993 wildcat mountain cat 700 EFI with a spark issue. Here is what I have done and what is happening. Checked my tss and kill switch and jumped all 3 are tied together. Has a new stator and pick up. I'm trying to figure out what is tied to coils that would stop the spark. I have the hood off and lnline spark testers on. It will start fine and idle great, you can ride it around with 1/4 throttle but at about 1/2 throttle you can watch the spark go away on the testers and will fall flat on its face. Let the gas back to about a 1/4 throttle and all is fine. something in the ignition has to be opening up and grounding out the coils I think?? Any ideas and help would be appreciated.

Thanks
Mark
 
L

lenny

Guest
This may be a hair brain idea but what voltage is it producing? Is there a Voltage regulator that could be bad and ignition cutting out to prevent frying harness and electrical components. I seen this on a atv and it would start to interrupt spark at about 16 volts.
 
M

markscat

New member
Well today I ck the voltage at the battery 13.5 @ idle when I bring the rpms up voltage stays at about 12.7 I did put a good used throttle assy. on tested the tss with a ohm meter from closed to open throttle and the kill button all ohm out good. I will back probe the TPS and make sure its good. Did they buy just the TPS to fix it. What was the symptoms they had. Thanks everyone for your feed back my son is wanting to see his sled run got it last year and only got to ride it once --bummer-- The throttle assy. I put on is the one that went on the handlebars.
 
Last edited:
L

lenny

Guest
I'll try an ask one of our mechanics tomorrow and post something. Your half throttle thing is what is odd and I'm no mechanic.
 
W

Wyelde

New member
I used to own the exact same sled. I had a similar problem that after months of trying things turned out to be a bad ground behind the EFI computer. It was just a ground wire that bolted to the frame, but it was broken inside the insulation so it was not immediately obvious. I have no idea how this could cause the symptoms I was having, but they were like yours, the sled would start and idle fine, but would cut out over a certain RPM. Don't know if this is your problem, but figured I would post.
 
M

markscat

New member
Thanks every one for all the ideas. I did get it going today I ran a ground wire from the battery to the body ground. Runs great now. Its weird because it ran fine for a few days when I first got it.
 
You must log in or register to reply here.
Top