Anyone here an expert on small engine repair? I have a bit of a delemma with conflicting information on my 2 cycle trimmer. It's a Husqvarna 128CD that I bought new last spring. In preparing my lawn equipment for the season as I do at the start of every season I went to restring and tune-up my trimmer and discovered that the spark plug that was factory installed in my trimmer was a Champion resistor RCJ8Y. Okay, nothing odd there, pretty typical plug for a 2 stroke engine of this type. The problem is that in reading the paper manual that came with the trimmer it specifies to use a Champion RCJ6Y resistor plug. That's a cooler plug by 2 heat ranges. I went to Husqvarna's website to view the parts list and schematic for my trimmer. They basically have several models of trimmers that use the same engine. The parts list for my model indicated the plug to be a RCJ8Y, but the updated online owners manual still specifies to use the colder RCJ6Y. To make matters more complicated the manual specifies to use only a resistor type spark plug and I can see no reason why a simple 2 stroke engine would need a resisitor type plug. In fact I can't even see why a simple 4 cycle mower engine would need a resistor type plug. Regarding the resistor plugs I know exactly why some larger and more complicated engines need them, that's not the question.
The three big problems are:
1. Husqvarna really hasn't given me a good answer.
2. I can easily find the RCJ6Y plugs at a number of places. But, there isn't an auto parts store, home center, hardware store, or small engine repair shop locally that sells the resistor RCJ8Y plugs. They all only sell the non-resistor CJ8Y.
3. Will using a non-resistor plug in a 2 stroke engine cause any damage to the coil. I suspect this is the only reason why Husqvarna is specifying a resistor plug in it's engine, to prevent damage to the coil.
In examining the factory installed RCJ8Y plug I can see that it seems to be the right plug with no indications on the electrode of excessive heat or fouling either and it seemed to run great last season. I worry that the colder RCJ6Y might not be hot enough to keep the 2 stroke running reliably and will foul faster. Asking a small engine repair shop about this is a waste of time. Most guys there are on the job trained and it's a lot like asking a gunsmith what his favorite guns are - the ones that break most often and come in for repair. Those small engine shops figure the faster your machine breaks the more business they will have sooner, they're not going to tell you how to keep your machine running best the longest. I know first hand because I once briefly worked in a chainsaw and lawnmower shop sharpening blades and tools a long time ago. Any thoughts or info will be helpful. Thanks.