Here is a list of things it could be. pull spark plugs check compression. all cylinders need to equal each other within five percent, and be over 100 lbs of compression. I don't know the year model but, some gp1200 comes with a security key pad. click here for a link to Yamaha, for the owners manual. it will give detailed instructions on how to reset code. last find the starter solenoid I have attached a picture.in the picture it has a number one marking the image. the discription at the bottom says starter relay assy A quick test of the starter is to jump across the leads. You need to be careful it will arc. best thing to use is a short screw driver. use the metal shaft of the screw driver to connect both threaded connectors on top.
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