Well I finally got to work on my Busa a couple of weeks ago. Although I am learning a lot, it still isn't fully running. But here's where I'm at so far.
For starters, this motorcycle is so different from every other one that I've ever owned that I had a hard time figuring out where to start. Fairings everywhere made it difficult to tie down on a platform or even see the engine, but I'm past that part now. I found that the fuel pump wasn't running, in spite of it being new. Found a loose wire on the plug from someone raising the tank too far without unplugging the wiring. I was able to fix that and get the fuel pump running again.
Once it was running, I was once again able to get it to fire, but only for a second or two. I finally got to thinking that if I felt the exhaust pipes to see if they were all warm, that would help. I found that the #3 cylinder wasn't firing at all.
Next up was to take the air box off and check for compression. That cylinder had around 130-135 psi cold so that seems adequate. Plug looked brand new. I checked for spark and it looked kind of weak so I swapped out the coil pack for the one next to it and it looked the same. Probably enough spark to fire if there was gas in the cylinder was my thought.
So with compression and spark, it seemed that it must be a fuel issue. I pulled the injector on that cylinder out and the gasoline that came running out of the fuel rail was almost black. it looked like #2 fuel oil. Looking into the injector, I could see black crap in it so I pulled the filter basket out and flushed the injector with carb cleaner by putting 12 volts to the solenoid on the injector. I pulled the rest of the injectors out and tested the coils with an ohm meter and they all are close to 14 ohms. One other injector had crud in the basket so I flushed that out too.
Today I put it back together and tried starting it and it would run at idle for up to about 5 seconds but still won't stay running. And the exhaust pipe on #3 cylinder still isn't warm when I try starting it. The others are warm to the touch after a couple of tries starting it. And if I give it any throttle at all it won't even fire.
And I forgot to mention that I put an inline fuel pressure gauge on it and it shows 46 psi when cranking and stays running for a few seconds after it stops running.
I'm kind of wondering it there may be air in the fuel rail that needs to be worked out or something. I have some new filter baskets ordered as well as O' rings and some screws that had messed up heads from before I got it so I'll still be at it for a few more days but am kind of at a loss as to what would make it idle but not run faster than that.
Anybody got any ideas?
