Hi there, thanks in advance for any feedback. The bike has 200 miles and 51 hours on the clock is a clean one owner, belong to my lady friend I started troubleshooting this problem by pulling fuel pump out of the tank was a lot of rust from ethanol poisoning and filter was rust orange so we got a new fuel pump and filter cleaned the tank and blew the hoses out, started it up and it was idiling high with a little hunting, read some and brought a new idile control value and that cleared the idile problem But still runs for for a couple minutes then dies, will start most of the time by push the starter button, leaving the key on, but give it any throttle and dies, sometimes with a backfire. I’m not wanting to purchase Honda special tools but will if necessary. Saw a thread about the back angle sensor, tested that and it works, needing to be reset by turning off the key... just got a in line spark checker and bright sparks until it dies so fuel isn’t the problem. I ran it not giving any throttle and it ran for 10 minutes before I tried to give it throttle then it died instantly with a loud shut down backfire! HELp! Oops didn’t put the original problem here, but it’s doing the same thing now; will start up and run for maybe 5 minutes of riding or 10 minutes of idle it then dies

 

I don't understand the logic of this "just got a in line spark checker and bright sparks until it dies so fuel isn’t the problem." Unless you mean the spark disappears causing the engine to stop.

Old model 420 used to do this when one of the relays in the battery box became unstable. Though it took a while before it would restart when the fault was on

Did you blow the injector out when you fitted the new pump? Is the EFI light coming on when the fault occurs? If it is, the fault will show up with diagnostic tools, cheapest is the one that jumps two wires in the maroon plug under the coolant filler flap. However, this gives Morse code fault codes on the dash, you need the workshop manual to interpret them and they are a right pain to read, as there can be more than one fault showing up. Why Honda can't put codes up as numbers on the dash display, like Suzuki, I don't know.