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FJR Motorcycle Forums
Technical & Mechanical Problems
FJRF011: Fast Starter Syndrome
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<blockquote data-quote="ionbeam" data-source="post: 1286838" data-attributes="member: 277"><p>A big -1 for your dealer.</p><p></p><p>It is possible for a rich fuel mix (like starting cold, then shutting the engine right off again) to wash oil off the cylinder walls. There have been a number of reported sticking rings. When my engine was torn down at &lt;40k miles every piston had stuck ring(s). There have also been reports of carbon holding valves slightly open. Yamaha Ring Free seems to work real good; it is a very concentrated boat fuel additive, the normal bottle size is intended to treat an entire boat gas tank so dose accordingly. Ring Free will clear carbon and free stuck rings. Run a few treated tanks through the engine and check compression again. I'll state what you probably already know; when checking compression be sure the battery is fully charged and the throttle is wide open. Without a fully charged battery the slower cranking can cause lower compression readings and the open throttle lets the cylinder breathe deeply.</p></blockquote><p></p>
[QUOTE="ionbeam, post: 1286838, member: 277"] A big -1 for your dealer. It is possible for a rich fuel mix (like starting cold, then shutting the engine right off again) to wash oil off the cylinder walls. There have been a number of reported sticking rings. When my engine was torn down at <40k miles every piston had stuck ring(s). There have also been reports of carbon holding valves slightly open. Yamaha Ring Free seems to work real good; it is a very concentrated boat fuel additive, the normal bottle size is intended to treat an entire boat gas tank so dose accordingly. Ring Free will clear carbon and free stuck rings. Run a few treated tanks through the engine and check compression again. I'll state what you probably already know; when checking compression be sure the battery is fully charged and the throttle is wide open. Without a fully charged battery the slower cranking can cause lower compression readings and the open throttle lets the cylinder breathe deeply. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
FJRF011: Fast Starter Syndrome
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