I have a big problem with my 2010 YZ450f and was wondering if anyone could give me some insight on the matter. I have been a proponent to FI on motocross bikes... but right now I am changing my thoughts!!
FYI, the bike has 72 hrs total. I replaced the piston last season @50 hrs and have since put 22 hrs on the replacement stock piston.
Second ride of the season, started without issue (second kick) after 3 laps on the track.. riding slow in first gear to the truck the bike sputters and dies. Kicks over fine, but would not restart. As a note, during my first ride of the season the bike died while idling warming up, was hard to restart but did eventually and ran fine afterwards for about a 1.5 hr ride with no issues.
This is what I have done/checked so far:
Checked spark- good (replaced plug anyway)
Checked ECU- good (swapped from running bike)
Check ed Fuel pump – good (swapped from running bike)
Checked fuel injector- good (swapped from running bike)
Checked FI capacitor- good (swapped from running bike)
Check ed rectifier/regulator- good (swapped from running bike)
Checked ac magneto- good (resistance checks)
Checked tps- good (resistance checks)
Checked valve clearance and cam timing - good.
On the FI tuner no error codes show up.
When I pull the plug, it seems dry to the touch... ie it is not getting fuel and makes sense why it died on the way to truck but cannot figure out why.
Basically where I am at would be to buy the FI diagnostic tool and see what code it gives me because I basically ripped apart an entire running bike aside from changing the wiring harness to no avail. FYI when the other bike was put back together it runs fine.
Any suggestions other than the FI diagnostic unit?
Edited by Davey762, 03 April 2012 - 06:19 AM.