Question about 2007 KTM 250 SX
Has major air leak (running seriously lean). If it is hard to start I would check carburation and crank seals.
Posted on Dec 14, 2012
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Dec 14, 2012 | 2007 KTM 250 SX
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It is quite normal for the exhaust manifold and turbo to get very hot, especially when the engine is working hard running at high speed under load. Every time the mixture in the cylinder is ignited there is a small explosion producing a BIG flame and a lot of heat to push the piston down. A lot of this heat goes out the exhaust. During daylight it is usually not noticeable, but at night it will visibly glow up to a bright red.
In relation to the oil pressure dropping, providing the oil level is at the correct level, there may be a restriction in the gauze filter on the input of the oil pump due to sludge buildup. Once the engine warms up and the oil thins out, the oil pump can't work at maximum capacity. The drop in RPM could be caused by the turbo getting insufficient lubrication and cooling due to the low oil pressure reducing oil flow to the turbo causing it to not work at its optimum speed and efficiency and therefore through reduced air flow into the cylinders the engine would tend to loose speed especially when under high load. The drop in RPM could also be caused by a problem with fuel flow to the injector pump causing the engine to run lean which would not allow the engine to produce maximum power and also contribute to higher exhaust temperatures because the governor would have the throttle wide open to try and maintain the engine speed when the generator is required to produce maximum output.
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