verslagen1
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Savage Running Rich Jack (October issue) reported that his 1995 Suzuki DR350SE was running rich. I recently had a similar problem with my 2001 Suzuki Savage. While troubleshooting the problem, I disconnected the vacuum line that runs from the fuel petc0ck. I noticed a slight smell of gasoline in the line. So, I left it disconnected from the petc0ck, capped off the open petc0ck nipple, and capped off the vacuum line. End of problem. I suspect the vacuum diaphragm in the petc0ck was leaking and allowing fuel to flow through the vacuum line into the intake manifold. Now I just run the bike with the petc0ck lever in the “prime” position. Someday, I’ll get around to replacing the vacuum diaphragm in the petc0ck housing (maybe). I hope this helps. Duane Carey ----------------- It’s an answer but not a great answer. The reason there is a vacuum line and control to the petc0cks is that the inlet needle and seat which controls the flow of fuel into the carburetor’s float bowl is not a perfect seal (ask anyone who’s had a manual petc0ck and left it on for a day or three). The gasoline slowly seeps into the bowl when you are not riding, and when the level of the fuel gets high enough, it flows through the jets, down the intake tract, past the valves and into the cylinder. At this point a few “interesting things” can happen. Best case scenario, the fuel goes past the rings, washing the oil off the cylinder and contaminating the oil in the sump. This can actually lead to an explosion when the bike is run (not often though), but it always leads to the oil not lubricating things right. The other interesting thing is that if the gas stays in the cylinder, and the piston comes up, the gasoline does not compress, so, it can bend your connecting rods, break your piston or other part that is weakest. My advice: fix the petc0ck.
From the Dec'06 downtime files of MCNews
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