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That UH-OH smell! ( long)
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[QUOTE="CC_RIDER, post: 144871, member: 23240"] I'm having a tuning nightmare. My local KTM dealer keeps changing racing fuels. Up until a month ago I had been using Superfast and was running strong and smooth, then he changed to VP (12). I started running a little too rich so I rejetted. Now he has changed again, to Trick. So I bought a new plug and headed out to do some testing. I noticed a marked improvement in my response from off idle, but then it started four stroking with little surges. When it finally got on the pipe, there was a definite miss and did'nt seem to rev out all the way. All the above was in about a quarter mile pass. I turned around to do another run back the other direction, and noticed a strong smell like something burnt, in the air. Well I was cranked to full throttle before I realized that smell had come from my bike. I was smelling the exhaust from the first pass. This was a smell I had smelled before, like an engine that had been run dry of oil. Visions of black and blue bearings and races ran thru my head. I immediately shut it down and coasted to a stop. I first checked the engine, and it did'nt seem any hotter to the touch than usual. I did notice a line of white smoke filtering from the silencer, and a thin runny spooge dripping from the spout. I pulled my plug, and it looked about right, and was not too hot to hold. I then cranked the engine thru by hand to see if it was trying to seize, but it cycled fine. I did notice a sizeable puff of white smoke from the silencer, so I checked that out again. The smell was definitely coming from the pipe/silencer. There was more spooge than I had ever seen. It was all over the back tire and rim, and was slung from there all over the underside of the fender and along the swingarm. As I said earlier, I had been running a little too rich and had noticed a thick dark spooge that would run down the side of the silencer spout. But this was excessive spooge, and much thinner in consistency. Where I ride, I don't get to really "blow it out" much. Could it be that running at full throttle was just burning and blowing out all the accumulated spooge in my pipe and silencer? Would it cause that burnt bearing smell? Could it just be the way the Trick fuel smells? This incident really scared me. I put my plug back in and road back to the house very slowly. The bike seems to be fine, however I will give it a good check up tomorrow. I did notice that the inside of the silencer looked like it had been surgically cleaned! Before I left this afternoon it was black and sooty. Has anyone here had any experiences like this? What were the results. Here are my specs: '97 250 SX Trick mixed 40-1 Bel-Ray MC-1 NGK BR8 #45 pilot # 170 main N85D needle, clip in middle air screw 1 1/2 turns out altitude 850 ft. temp 92 degrees. running on flat pavement. Would this jetting/fuel combo fry my engine? Please respond if you have ANY thoughts on this. Thanks. [/QUOTE]
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That UH-OH smell! ( long)
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