Diagnostic help please

[acecase09]

Well I am reaching out to anyone who reads this for ideas. I am not in anyway bashing CSC or their support, they have been great, and they are doing everything they can.

First a few facts. I am by no means an inexperienced mechanic. I have 30 years of experience. I am also an IBEW wireman/ welder by trade. I have a 2019 RX3 with 786 miles. Shortly before the 500 miles was up, the speedo quit displaying speed and the abs quit. It was found while checking battery connections that a frame screw had been put through the + cable and was causing an intermittent ground. There is a pic of that attached. CSC sent me a new ABS unit, which controls both the abs and the speedo display.

Right after that, about 550 miles in, the bike would not idle down and continued to climb in rpm on its own until it hit rev limiter or it was shut off. Fun ride home let me tell ya, it had no power, bogged, popped and surged.

You can see that in this link:



Note on above, I did not blip the throttle, it did that itself.

I checked all connections and cleaned the O2 sensor and the O2 sensor did the trick. Joey from CSC sent me a new O2 sensor. Another fact is that I bought a brand new motorcycle to ride while I was doing/having some extensive work done on my truck. Its my primary ride to and from work, therefore, I kinda have to ride it.

A day or two after I cleaned the sensor, waiting on the new one from CSC, it dii it again. In the shop, I noticed that the crankcase vent tube was full of liquid, which turned out to be gas. Checking the oil revealed the crankcase to have a substantial amount of fuel in it. On the phone with Joey at CSC, he figured the Injector was leaking. He sent me an injector and loaned me a scan tool as well as including a new oil filter and oil.

Now I have been riding and racing for 25 years. I carried an AMA supersport license for years. I have ridden just about anything that can be ridden. My impression of the RX3 was it doesn’t feel smooth, its buggy to start, and there should be more power. I also thought the fuel economy was a joke. 60-70 mpg, not even close. I chalked it up to the fact is was Chinese and it is not a BMW, Ducati or even a Honda. After replacing the Injector, O2 sensor and oil, I took it out. It was like a new machine. I spent 7 hours ridding offroad and it was running like a $15K motorcycle. For the first time since I bought it, I was truly happy with my purchase.

Then yesterday on the way home from work, this video was taken.



It was idling high and had no power. It never over revved like it did before, but was struggling to do 35 mph. I left the highway and got on some dirt, so I would not get run over and had to stop for 5-10 min for a train. When I restarted it, idle was normal, however it was still not running smooth. At constant throttle, it was surging and falling slightly. Listen to the video above, trying to throttle up, it shuts off, hard. After the train, here is what it was doing:





This morning on the way into work, it was not running perfect, and power was a little low, but it got me to work with no issues. I am expecting to ride home in some heavy rain, so that might be more of an adventure than I want. I am in Jackson SC, 29831 if you want to pull up our weather and see what is in the forecast.

In the area where I am we have a couple of bike shops. All of them have a 3-5 month lead time on repairs. Well the four good ones do. The others are ok for tires and such, but nothing that involves brain function. Because of that I am stuck working on this myself.

Writing this, I have not heard back from CSC yet, that are not open and were closed Monday. I intend to take the scan tool with me and next time it act up, check the live data. I am interested in the throttle position sensor value, but am open to anything. No codes have been found, stored, pending or historic. Throttle position sensor value was normal when I tested it. Charging system and battery have been extensively monitored and tested, both are in excellent health. O2 sensor and Injector were replaced. Every connector in the wiring harness was checked for tension and engagement. I need Ideas. What do you think I should check? My only two thoughts is a going bad throttle sensor or the intermittent ground damaged the ecm unit.

Again, CSC has done and is doing everything they can to help me. They haven’t offered to replace the thing yet, but other than being a little slow on the email replies, they are being top notch.