landev
Member
Greetings,
I picked up a "project" bike a couple of months ago, 2005 R1200ST with very low miles that had sat for ~ 3 years, same gas, gooey oil, lots of cracked rubber. There were some open recalls, most pertinent to this issue was the fuel pump.
I drained the tank, put on a new fuel filter and rode it to a dealership ~ 90 miles north. It coughed and sputtered a bit before and after the recall service. (new fuel pump, banjo bolts, wheel flange, etc..) I have since adjusted the valves, new plugs, synced the TBs, new oil/filter, new air filter. The bike is running much better, but still has an issue when you blip the throttle. It feels like goosing the throttle shuts of the fuel supply until I release the throttle and things return to normal. I can throttle the bike hard (as long as it's a gradual increase) and it runs fine... actually it runs very strong. The loss of power is consistent however and happens EVERY time I goose the throttle. Seems if it were a fuel issue, it would stumble regardless of the rate of loading.
I've come down to the idea that it's either a bad coil or fuel pressure regulator. When I did the throttle body sync, the GS911 showed me that cylinder temps were within .5 degree temp of each other. As I understand it, a bad coil would result in cooler temp on the bad coil side. Dunno. Primary resistance on all coils is between 1 and 1.5 ohm.
This certainly "feels" like an electrical issue, but I'm still mystified about the feeling that it's just got either not enough fuel or too much. I'm now on my 3rd tank of fuel (with Seafoam) since draining the crap out of it. I also should mention that the injectors seem to have consistent patterns from one side to the other.
Any ideas on this? Do I just need to run a few more tanks of fuel and see what happens?
Thanks in advance!
-l-
I picked up a "project" bike a couple of months ago, 2005 R1200ST with very low miles that had sat for ~ 3 years, same gas, gooey oil, lots of cracked rubber. There were some open recalls, most pertinent to this issue was the fuel pump.
I drained the tank, put on a new fuel filter and rode it to a dealership ~ 90 miles north. It coughed and sputtered a bit before and after the recall service. (new fuel pump, banjo bolts, wheel flange, etc..) I have since adjusted the valves, new plugs, synced the TBs, new oil/filter, new air filter. The bike is running much better, but still has an issue when you blip the throttle. It feels like goosing the throttle shuts of the fuel supply until I release the throttle and things return to normal. I can throttle the bike hard (as long as it's a gradual increase) and it runs fine... actually it runs very strong. The loss of power is consistent however and happens EVERY time I goose the throttle. Seems if it were a fuel issue, it would stumble regardless of the rate of loading.
I've come down to the idea that it's either a bad coil or fuel pressure regulator. When I did the throttle body sync, the GS911 showed me that cylinder temps were within .5 degree temp of each other. As I understand it, a bad coil would result in cooler temp on the bad coil side. Dunno. Primary resistance on all coils is between 1 and 1.5 ohm.
This certainly "feels" like an electrical issue, but I'm still mystified about the feeling that it's just got either not enough fuel or too much. I'm now on my 3rd tank of fuel (with Seafoam) since draining the crap out of it. I also should mention that the injectors seem to have consistent patterns from one side to the other.
Any ideas on this? Do I just need to run a few more tanks of fuel and see what happens?
Thanks in advance!
-l-