Limp Mode: Secondary Throttle Valve Actuator c28 & c65
Went on this year's first local Wednesday ride and at about 40 miles in my bike went into "limp mode" and the FI light came on. As you may know, that is when it will run fine if you only tenderly open the throttle. Puled over shut it off poked, cursed, got back on. No light and it would accelerate as normal for about 2 miles. Then the light and limp.
Made it home okay (Limping still allows you about 70mph if you nurse it.) The next day was the same 2 mile limit before the light comes on. In dealer mode it shows two codes; c28 & c65. Engine temp normal. Voltage normal.
I've read through the forum and don't see a lot about it. I did find one thread where GreyWolf asked the victim if his bike would start without pulling the clutch lever in. (huh?) He answered yes, replaced the clutch-lever switch and the problem went away. Man GreyWolf was good. I never doubted him before and I have always robotically pulled the clutch to start. So I tried it and my bike would start without pulling the clutch. So that will likely fix the c65 code. But I can not believe that will cure the c28 which seems to be that the secondary butterflies are not opening.
AS for recent maintenance: I did, a few days before, replace both sprockets and chain. Cleaned the clutch push rod. Installed a new rear tire. I had put maybe 20 miles on the bike after that and before the failure.
On the internet, at large, I have found tons of older GSXR guys having the sensor fail from failed soldering. When I look at the parts fiche the V2 part
.SENSOR ASSY #13580-27G21 $89 looks different in design.
Secondary Throttle Valve Actuator c28
Current Rides: '14 DL1000 ADV, '06 SV650N, '93 900CBRR, '74 Ducati 750GT ['02 BMW K1200rs SOLD Aug '17]