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Spark plug wires

E

Eric Hosette

Member
Been having issues with getting enough spark to the plugs. Just doesn"t seem to have a large spark while trying to start. I"ve tried a few different types of wire and am still having issues. The mag was just rebuilt and is very hot. Any suggestions?
 
what do you mean by different types of wires.
there is only one wire that old tractors use... it has to be the wire core not carbon core.
also is the impulse coupling working?
what tractor is this on?
where are you checking the spark?
new plugs or old plugs?
 
Magnetic suppression wires (Sorensen or other brands) are desirable. they have zero resistance, and are made from real wire wound into a spiral in the core. This allows full spark energy while eliminating static in nearby radios and TV/Computer systems. Copper wires are also good, but have the issue of static. Do not use carbon core resistor wires. Jim
 

I agree, they seem to have a Capacitive effect and seem to make one HOT spark.!
I make sure the spiral ends are soldered to the end fittings..

Ron.
 
What is this on? How do you know that it is a spark problem? The other post are right about actual wire cored wires being the best. Perhaps needs new plugs. How do you know they are good? Ussually a good hot mag has plenty of spark if plugs and wires are good. Not sure how you are checking spark if you are suspecting bad wires. More info would be nice.
 
Mags like solid copper wire .Call up Joe Hunt Magneto and they will sell you good wires but you have to make up the ends.
 
A magneto also does not have a fantastic spark at cranking speed. A mag spark increases with RPM. You may have automotive wires that have resistance for radio suppresion. If it cranks and starts there is nothing wrong now. Drag a clean business card through the points once making sure no paper fibres come of it could be dampened with contact cleaner . This just ensures the points did not pick up some dust or oil. Sometimes one swipe with the card and the mag is back to perfect.
 
The way I test this is ; there is an inline spark test tool with a spark plug end and a plug wire end . Stick it in the coil [batt coil ] or in the mag cap ground a spark plug in it and crank. Good flashing light -- good magneto [or batt/ coil] now stick it in the end of the plug wire -if it gets any weaker -there it is problem in the wire. Unfortunatly these little spark testers were made by Bonney but are all now imported. You can also bend the gap open on the plug to see how far the spark will jump.
 
http://www.amazon.com/Lisle-20610-Inline-Spark-Tester/product-reviews/B0002STSC6/ref=dp_top_cm_cr_acr_txt?showViewpoints=1 Heres one made by Lisle . Got good reviews except for cases where that style [90degree] cap would not fit on the mechanics application like some Volvo head.
 
I did notice the impulse coupler doesn"t snap as much as it did before. It is catching and releasing, but not with the snap it had. The tractor is a 15-30 IHC. Has a KW mag. I currently have copper core wires on it. Not sure what kind were on it before and they were old and put on before me. The plugs are new.
 
huh... a mag has the same spark at cranking as engine running. that is the purpose of the impulse coupling. once that impulse trips you have mega blue spark. how did these tractors ever start if they had poor spark on the crank? they would have to hook the horses up to pull the tractor. the whole idea of the mag is slow rotation with the crank. many start with 1/4 turn or one cyl firing, such as mine. I know they start better than distributer engines with a crank.
 
A magneto spark increases with RPM .Thats all I said .That is a fact. A mag is an AC device. I didn't say they had 'poor spark' just not as hot as higher RPM at cranking . When you say huh you sound like an idiot.
 
The fact that there is an impulse coupling is proof of this . Why don't you tell the original poster about checking that instead of starting an argument with me. That could be his problem..
 
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