High compression tighten gap, haven’t heard of many guys having issues loosing spark on high comp saw builds, maybe on alky. I run a pretty tight gap on alky banshee, I do it to be safe and it fires even when it’s really fat! The crazy thing on the dyno was how much power was lost with old plugs, and every time I put new plugs in I got max power! Fresh plugs vs the old plugs I can in with 10hp! And semi used plugs were right in the middle, made three back to back to back pulls, it was crazy! I should try plug gap on the dyno, nothing should be overlooked! lol
I tested both on alky and gas, the results were the same, it was an eye opener to say the lest! I am not sure if it is caused by a week ignition, but I was making 108 on the best pull on gas and then put the plugs I came in with 98 and put the plugs I was tuning the motor on, made maybe a dozen pulls with, they made 103, then new plugs....108, all on the same tune. The other interesting thing at least with this motor, it made more power a little rich, Ileaned it up two main jet sizes and one needle clip position and it sounds mean, incredible response and lost 20hp! I was blown away!!
I honestly don’t have any evidence to support the proper gap number, I run a .018 gap in my banshee and am able to make good power, I didn’t do an gap testing other than .018 and .020 and that made zero difference so I am sticking with .018 for now, maybe next time!
That's what my assumption was. I just didn't know if anybody knew how much.Just like a turbo engine the more boost the tighter the gap and the higher the compression then you better believe it you should tighten up plug gap less chances of miss fire. That's my story and I'm sticking to it.
get some of this and a heat gun. You won't have to wait for anything to set up anymore. Been using the heck out of it as of lately.
In most of my Saw's I set my plug gap at 19 and never really had any problems plus people over look also is heat range of a plug to but that's a different game to.
I was thinking on many of the same lines! The plugs didn’t have much or any erosion, the second set that had maybe 12 pulls were clean, but had color, they were darker than tan but not crazy black. I think it is like you were saying, either slightly delaying spark or not getting a hot enough spark, I was surprised on how fast that occurred! The mildly used plug would equate to probably 30 minutes of run time max, not all wot, but I am still shocked. It kinda confirms the feeling you get when you put a new plug in your dirt bike and it felt faster! Lol
