ND4SPD68
New member
OK - I'm getting more & more familiar w/ the R bike ('04 R1150R Rockster) and it's issues... I think I may have narrowed the problem down to failed stick coils.... After adjusting valves, syncing TB, changing plugs. Here is what I got... Hard starting when cold, engine feels sluggish and seems to have a flat spot under hard accelleration from 4.5k - 6k rpm. I've done some reading and given the idea that the primary stick coils could be bad. Here are the symptoms I've got - with the engine running/idling warmed up - I disconnected each primary coil one at a time and noticed absolutely no difference in how the engine runs. Knowing there are secondary plugs firing - I disconnected them both, and with both primaries connected, the bike would not start and only spit/sputtered. Reconnected secondary plugs and bike starts and runs like before. This would lead me to belive both stick coils are failed - how likely is that??? Is there away to test the input signal/voltage to the coils to make sure they are in deed failed - what actually triggers them - I assume the computer via the hall effect. Is it safe to say the same input goes to the secondary coils? So if that coil works the other output should be OK...?? Any input/opinions would help on this - I'm trying to determine in fact that the stick coils are bad... Thanks!!
Last edited: