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FJR Motorcycle Forums
Technical & Mechanical Problems
"advanced" Throttle Body Synchronization
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<blockquote data-quote="Ramblin Man" data-source="post: 222" data-attributes="member: 115"><p>Did you remember to put the little rubber caps back on?</p><p></p><p>Here is the method to adjust the throttle bodies at 4K rpm.</p><p></p><p>First get a big fan and put it in front of the bike to help cool it while you do this because it can take some time.</p><p></p><p>tank raised</p><p></p><p>manometer attached</p><p></p><p>air injection hose disconnected and pluged</p><p></p><p>start the bike and let it reach two bars.</p><p></p><p>Using a throttle lock or an assistant, set your rpm to 4K with the throttle and hold it there. Observe your vaccuum readings. if they are the same or very close you are done.</p><p></p><p>If they are different, locate the throttle linkage adjutment screws. There are three. One adjusts 1 to 2, another adjusts 3 to 4, and the other adjusts 1-2 to 3-4. They are easy to see. good size screws with springs....</p><p></p><p>The idea here is to get 1 equal to 2 . then get 3 equal to 4 , then adjust 1-2 to 3-4 so they are all the same.</p><p></p><p>My suggestion is to do this at the RPM that buzzes above 4k. My bike was smooth right at 4k but by 4300 it was pretty buzzy. So decide where you really want it smothed out and do it there because it will probably be worse there than at 4K.</p><p></p><p>Once you move the plates you need to redo the idle sync and then recheck the 4k values. You may need to do a few rounds to get it just right.</p><p></p><p>Remember to SLOWLY close the throttle because vacuum raises on decel.</p></blockquote><p></p>
[QUOTE="Ramblin Man, post: 222, member: 115"] Did you remember to put the little rubber caps back on? Here is the method to adjust the throttle bodies at 4K rpm. First get a big fan and put it in front of the bike to help cool it while you do this because it can take some time. tank raised manometer attached air injection hose disconnected and pluged start the bike and let it reach two bars. Using a throttle lock or an assistant, set your rpm to 4K with the throttle and hold it there. Observe your vaccuum readings. if they are the same or very close you are done. If they are different, locate the throttle linkage adjutment screws. There are three. One adjusts 1 to 2, another adjusts 3 to 4, and the other adjusts 1-2 to 3-4. They are easy to see. good size screws with springs.... The idea here is to get 1 equal to 2 . then get 3 equal to 4 , then adjust 1-2 to 3-4 so they are all the same. My suggestion is to do this at the RPM that buzzes above 4k. My bike was smooth right at 4k but by 4300 it was pretty buzzy. So decide where you really want it smothed out and do it there because it will probably be worse there than at 4K. Once you move the plates you need to redo the idle sync and then recheck the 4k values. You may need to do a few rounds to get it just right. Remember to SLOWLY close the throttle because vacuum raises on decel. [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
"advanced" Throttle Body Synchronization
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