> Colby T Wrote:
> live ɘvil - Thanks. I thought I read about someone on here using a
> Polini 70cc kit. Any advice on whether the kit likes a resistor vs.
> non-resistor plug better?
Does not matter. Resistors are radio frequency suppressors to eliminate interference with electronics. You might get a slightly stronger spark without a resistor.
> I appreciate the input on this from everyone. I kind of expected that I
> may have to figure out which version of the NU50 head I would be using
> first, and then see which plug I would need. I was just hoping that
> someone may have been in the same situation and could say which plug I
> needed so I could be ready ahead of time.
You'll need the Champion or equivalent regardless of head because of domed piston in kit. You're not gonna find a head that gives more clearance to offset the domed polini piston.
> The NU50 I bought came with an
> Autolite 4123 plug in it which has a projected tip and resistor so I
> should be able to test if the projected tip is a "no go."
Bearing in mind that the insulator nose length is a determining factor in the heat range of a spark plug, the longer the insulator nose, the less heat is dissipated and the hotter a motor becomes. I dont think you're gonna have any shortages of heat running a 70cc kit with higher compression.
> Unless I find a reason that I shouldn't, I'll probably go with a plug
> with resistor whether I have to use a projected tip or non-projected
> tip. I am planning on adding a tach and temperature gauge and I have
> seen a number of complaints about erratic gauges when using a plug
> without a resistor.
I've never had any problem with non resistor plugs on my trail tech. I dont have the tachometer option though. (edited)