Won't start / backfire
I've read every thread I can find on here and VSRI etc but I'm at my wit's end.
05 dl650. Developed hesitation problem so I parked it until I had time to fix it. Life got in the way and by the time I went to work on it it wouldn't start at all.
I suspected the gas had gone bad since it had sat for 7 months, so I pulled the tank, did a vinegar soak and rinse, replaced the high pressure fuel filter and the mesh screen. I sprayed some carb cleaner down the throttle bodies and that immediately fixed the sticky throttle issue.
I put it back together, the pump works fine now (tested with measuring cup) and the bike will crank all day with no error codes.
But it won't even start to fire. If I pull the airbox top and hit it with starter fluid, it will fire up and run for a second or two. I pulled off the secondary throttle plates in case that was causing the issue too. I pulled the rear plug wire and checked, spark is good too. Although I figured as much since it fires with starter fluid in either cylinder.
If I crank it for a while with the throttle twisted all the way open, it will backfire through the exhaust. Although it did backfire through the intake once, I suspect that was because I just hit it with too much starter fluid.
Bike is stock, low miles, valves clearance was checked 1000 miles ago and was spot on, all connectors are seated well, all fuses are good (Unless there's more than the 8 or 10 in the box next to the battery) and like I said, no error codes.
I'm guessing it's the injectors at this point, because running with starter fluid means I have compression and spark, so fuel is all that's left. But if there's something else I'm missing please let me know. I guess they could both be clogged?
What's the consensus on trying to clean them? I have a small ultrasonic cleaner, but based on what I've read here they don't appear to be serviceable? Since it backfires once cranked for a while I'm assuming they are getting voltage but maybe they're stuck open or something? I'm a carb guy so I don't have much experience with injectors.
Thanks in advance!