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FJR Motorcycle Forums
Technical & Mechanical Problems
Bottom End Pressurization Problem
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<blockquote data-quote="Bionic Pelvis" data-source="post: 1107257" data-attributes="member: 17196"><p>This is what has me scratching my head. It's not just a dribble or wicking up the wires, it's a pressurized spray (but only sometimes). The stator wasn't recently replaced, but it was less than a year old. It's not leaking out of the top of the engine, unless you meant by way of the breather & stator grommet, and it is definitely leaking out of both. After I siliconed the grommet it leaked more heavily out of the breather, so it was easy to identify that as a second source of the leak and lead me to suspect something was causing pressurization. The spark plugs looked fine, it wasn't smoking at all, started easily, performed normally, exhaust header & ports are all dry, so on. 175 is still a fair amount of compression; is it enough to keep most of the oil out of the combustion chamber, but with just enough blow-by to pressurize the bottom end under the right conditions? It's definitely not a normal, run-of-the-mill "compression is getting low" scenario.</p></blockquote><p></p>
[QUOTE="Bionic Pelvis, post: 1107257, member: 17196"] This is what has me scratching my head. It's not just a dribble or wicking up the wires, it's a pressurized spray (but only sometimes). The stator wasn't recently replaced, but it was less than a year old. It's not leaking out of the top of the engine, unless you meant by way of the breather & stator grommet, and it is definitely leaking out of both. After I siliconed the grommet it leaked more heavily out of the breather, so it was easy to identify that as a second source of the leak and lead me to suspect something was causing pressurization. The spark plugs looked fine, it wasn't smoking at all, started easily, performed normally, exhaust header & ports are all dry, so on. 175 is still a fair amount of compression; is it enough to keep most of the oil out of the combustion chamber, but with just enough blow-by to pressurize the bottom end under the right conditions? It's definitely not a normal, run-of-the-mill "compression is getting low" scenario. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
Bottom End Pressurization Problem
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