HELP! Fuel/ TPS/ igniter/ stalling issue
Hi all! I’m seeking your help with a dreaded fuel issue. Let me start from the beginning...
This is the second 919 I’ve owned because I love them so much. I picked up this one (2002) with less than 10k miles in great condition for $1800. The kid I bought it from claimed to be a bike mechanic(doubtful) and jimmy rigged a different Throttle position sensor(TPS) on it. It ran fine if you were light on the throttle, but if I really tried to get after it, it would die and throw an F1 light. Well he included a used throttle body assembly and I took the right TPS off the extra throttle body and tuned it to perfection. It ran fine for a couple months prior to winter and I winterized the bike and put her in for the season.
Fast forward to a couple weeks ago. I got the bike out for the first time and it started running really rich. I rode it around for a couple hours and it acted like it did when the wrong TPS was on there. I checked the voltage on the TPS and it was within specs both open and closed. Then I was on the highway a couple days later and it wouldn’t rev higher than 4500rpm and bogged down whenever I tried to go faster. Long story short, I had to get my brother to pick me and the bike up on the side of the highway and now I’m working on a fix.
The bike starts after a few seconds of struttering and will idle like a champ, although it does smell super rich. If I slowly roll on the gas, it goes through the full RPM range. If I try to crank the throttle fast, it instantly dies.
Here’s what I’ve done:
Checked voltage on TPS - good
Replaced fuel pressure regulator - no change
Replaced spark plugs - old plugs looked relatively clean. No change
I’m in the process of getting the pump and filter out of the tank to change the fuel filter. If that doesn’t work, I’m kind of at a loss. Has anyone else experienced this issue and have experience? Could it be faulty igniters? Any other suggestions would be a huge help because I’m at a complete loss