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1998 mountain max 600

Does anyone now the specs/procedure for testing the throttle position sensor on a 1998 mountain max. it runs fine then goes to pot starts backfiring bogging etc and is intermittent have had it at the local yamaha dealer and if you can believe it they dont know what is wrong and have old me to take it else where?? The last time it acted up i moved the sensor then it worked fine for a while then the same problem i am getting very fed up any help would be appreciated
 
bypass the sensor by unplugging it and conecting the ends together.
If this fixes it replace it, leave it as is or install a tether.
If you leave it as is keep in mind that a frozen or malfunctioning throttle may
cause it to leave unexpectantly. I just use the emergency brake while cold starting.
 
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