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The automatic tranny relies on vacuum pressure from intake manifold to signal when to shift. As the engine RPM increases, there's a proportional increase in intake manifold vacuum pressure. When vacuum pressure reaches a certain point, that signals the tranny to shift up to the next gear. When this vacuum hose has a crack or loose connection, it sends the wrong signal as to when to shift because vacuum pressure is dropping as air enters through the leak source, which the tranny interprets as a need to shift down to a lower gear. Replace all the vacuum hoses and see if this solves the problem. Look at the tranny and identify any air hose connected to it. These are vacuum hoses that you should replace, which usually there's only 1 or two connected to the air intake manifold.
If your clutch is not slipping check your shift linkage joints. Rocking the bike lets you know your tranny has gears but the shifter pawl may need adjustment
You do not have this problem in any other gear, just third gear? What year and model bike are we talking about here. If you shift to fourth gear, does the bike pick back up again or does it continue to falter?
You 05 model has the TC88B engine. This is the counterbalanced engine and there should be no engine vibration. I'd suspect something on the right side of the engine that drives the counterbalances.
First of all you must check the gear box oil level,secondly see if the the gear box mountings if they are good,if the is cracking on it,it must be replace.
engine knocking is produced when when the pistons misfire. Try adding Octane 89 at the pump. if that fixes the noise then all set, if not then you have another problem much bigger.
Poor acceleration can be from drivers error. make sure you shift and the correct time and at the proper RPMs. Lets assume you are shifting correctly, the poor acceleration could be from a leaking head gasket.
From the sounds of it you need to have your transmission rebuilt, there is no quick fix for a fault in one gear. As far as the tapping noise goes quite often a oil change is all that is required to cure it.
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