Glad I could help.

When that happened to mine, the last thing I did and it worked was, at approximately the center of the handlebars there is a screw in connection on the throttle cable and I unscrewed it sprayed some CRC ELECTRONIC CLEANER screwed it back and viola it worked, Never had an issue since.
Try it, good luck.

Here's the bike, Thanks! P.S. Endgame for the question is I want to use FlatOut Tire Sealant Sportsman Formula and I don't think you can with tires that have tubes.