On the first ride of the day and with the engine warmed up when I shift into 2d gear, I experience stumbling (for a lack of a better description) as I open the throttle. And I don't mean wide open either. Then after shifting into the higher gears it's gone. At first I just chalked it up to the flash as nothing is perfect. And yes I've cleaned the throttle body. And it doesn't help. There aren't any vacuum hoses off or leaking either. I finally discovered while cleaning the throttle body that as I slowly start to open the throttle slowly the butterflies are fluttering. Quickly slightly closing and they are opening. They aren't opening smoothly. If I wrap the throttle open and closed a couple times, then slowly open the throttle they open smoothly. So, now when I first turn the switch on I open and close the throttle a couple times and don't experience the stumbling as I start riding. So, with great thought and pondering I summarized that it was probably the TPS. I'll just order one and replace it. Well, put a dress on me, slap me around and call me Susan, can't do that. You have to buy the throttle body to get a TPS as they are paired together at the factory. Can't even remove the TPS without taking the throttle body off. I did pull the connector and cleaned the contacts just in case the problem could be there. It wasn't. So, I guess I'm now asking the great minds of members here, what's your guess?
2013 Kawasaki Vulcan 1700 Voyager