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FJR Motorcycle Forums
Technical & Mechanical Problems
The Really, Definitely Completely Un-Authorized TBS
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<blockquote data-quote="Constant Mesh" data-source="post: 1314726" data-attributes="member: 615"><p>I'm of the opinion it's counterproductive to adjust the throttle valves. If they were perfectly clean (no crud buildup on the edges) and the throttle bodies were nice and clean inside an adjustment might offer an improvement.</p><p></p><p>But once crud begins to appear it has to affect the air flow for the small valve openings which are available for no-load conditions.</p><p></p><p>The valves are barely open for no-load conditions. Even at a 65 mph load on level ground the throttle valves are not open very much.</p><p></p><p>When there is a crud buildup in the air stream the adjustments will be affected by the crud variation from cylinder to cylinder. That effect will be most prominent for small valve openings. Once the valves are opened a lot more the crud's effect on air flow will be negligible.</p><p></p><p>My experience with these adjustments has been unsatisfactory. I wished I had never touched them.</p><p></p><p>After an adjustment I think I see improvement but very quickly I realize I was seeing a mirage.</p><p></p><p>Regrettably the FJR engine is a bit rough just above 4K rpm. You can't adjust it out. It's a feature of the engine.</p><p></p><p>The designers have acknowledged this by changing the gearing (slowing the engine) on the '06 and now again in 2016.</p></blockquote><p></p>
[QUOTE="Constant Mesh, post: 1314726, member: 615"] I'm of the opinion it's counterproductive to adjust the throttle valves. If they were perfectly clean (no crud buildup on the edges) and the throttle bodies were nice and clean inside an adjustment might offer an improvement. But once crud begins to appear it has to affect the air flow for the small valve openings which are available for no-load conditions. The valves are barely open for no-load conditions. Even at a 65 mph load on level ground the throttle valves are not open very much. When there is a crud buildup in the air stream the adjustments will be affected by the crud variation from cylinder to cylinder. That effect will be most prominent for small valve openings. Once the valves are opened a lot more the crud's effect on air flow will be negligible. My experience with these adjustments has been unsatisfactory. I wished I had never touched them. After an adjustment I think I see improvement but very quickly I realize I was seeing a mirage. Regrettably the FJR engine is a bit rough just above 4K rpm. You can't adjust it out. It's a feature of the engine. The designers have acknowledged this by changing the gearing (slowing the engine) on the '06 and now again in 2016. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
The Really, Definitely Completely Un-Authorized TBS
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