My bud Savagecre, forgot to mention that he knows something he's heard from a experienced nitro guy we both know. I'm also running a k4.6 by the way. I'm also using the same fuel as CRE, Blue Thunder 30% with no issues for some time now. If memory serves me correctly... The recommended cure (when you know your using the propper plug for your engine, and you know your fuel has been stored in a tightly sealed state when it's not being poured into your tank) is: Richen the highspeed needle / Lean the low speed needle. As simple as that. I would consider a method thats gradual in nature. By this, I mean to suggest that when you've got a new plug freshly installed, before you start the engine, richen the hsn and lean the lsn by one 1/8th turn each. Now start the engine and see what happens. Now, run the the truck and drive until it happens again. Did it take longer to foul this time? If so, than you no your on the right track. Replace the plug for a new one and do another 1/8th turn on both hsn and lsn again like before. Run the truck again like before and see if there's impovement. There should be. If needed, keep repeating these steps until your content. And remember, It's very possible to have fixxed this issue on the first attempt, Like Savagecre said earlier, there' a sweet spot you'll come to know of, as you learn to hear what your engine is reacting like. Try to listen in hear what your engine is indicating by it's behavior. Thanks Savagecre. And Site Jester is correct about the plugs. The k4.6 is a cold running mill. It likes mc-8's. I have mc-59's also, but I don't find a need for them with the k4.6 as of yet. I got them for my RS4's SS18 engine which uses a slightly hotter plug. When you think about this adjustment for this plug issue, it kind of makes sence. The lsn may be fouling the plug with unburned fuel, having been, too rich and the hsn leanness is baking on the plugs oilly build up. This subject is another thread. NOTE: I don't know how to explain this but, I think I've run, close to a gal. of fuel so far and I haven't replaced a plug yet. I think this plug at this point, has done it's duty with overkill. I would say, when you've lost count of the amount of tanks you've ran, your plug has provided a good life. And lastly, Make sure your 1 gal. fuel supply jug and quick pour fuel bottle are kept tightly sealed between tank fill ups. I say this because, NITRO METHANE HAS A VERY HIGH RATE OF EVAPORATION, and can deminish your fuels proformance quicker than your LHS can take your cash for the fuel. A depleted amount of nitro methane results to a concentration of the oils and additives in your supply. You don't want this, believe me. A well maintained fuel supply can be stored and last a long time.If you even susspect there's a quality issue in the evaporation dept.,I would replace it to be sure. I hope this helped, HotChiliRam.
