RogerJ
Waypoint Wanderer
Hello All! I have gone through the threads related to throttle body screw positions and getting acces to the diagnostic mode to reset the CO values to try to ease off idle stumbling, walking speed performance and quicker and smoother response under load. My unit is a Euro Spec model and it lives in a hot climate by the sea at sea level (Mexico)l. It uses Pemex Premium 92 octane the only fuel available. It has the usual rumbling at 3200 to 3500 rpm and still has a rumbling vibration in the 4000 rpm to 4800 rpm range under load.
Continuing to look for relief from the vibrations, especially in the 4000 to 4800 rpm range I went to my dealer yesterday. We set the throttle screws to the 3/4 CCW out from stop position and reset the CO values to +6. This was based on my reading of what Jaxon and Blue Eyes did way back when before their bikes were more heavily modded. I assumed that Blue Eyes must be at sea level more or less and Jaxon too. Colorado values for CO didn't seem to apply here. My bike is stock.
The tech said that at delivery, the throttle screws were 1/2 CCW out from stop and the CO values set at 0. He on his own earlier had set them to 1 1/2 CCW out from stop. The CO values for each cylinder were set at zero. That setting didn't resolve the vibrations in either of the rev ranges mentioned above.
The tech said that in hot ocean coast climates like this one it is difficult to get the motors to run properly. That is why he had set the screws out to 1 1/2 CCW turns. He said that on the motorcycles and ATVs they often have to open the throttle position screws much more than this and up the CO values to 10 or 15 or more to get them to run properly. Since the concensus of this Board seemed to be favourable around 3/4 and + 6 I opted for that.
Our discussion was that the rumbling and vibration areas I have may be related to a LEAN fuel mixture. So we opted to try initially the 3/4 CCW out and CO values of +6. I rode 220 km today and bike responds much better. Hasn't done that much for the vibration patches, especially in the 4000 to 4800 rpm range which is highway cruising range. Maybe a 10% improvement in the vibrations.
Question is.........does it make sense to try wider open throttle screw settings? In particular, moving beyond the 1 1/2 CCW turns out from stop by adding another l/2 CCW turn out for a total of 2 turns out which the tech was suggesting? Any considered suggestions about the CO values? Leave them at +6?
All thoughtful advice much appreciated from those who have done this modification and who may be in similar operating environments. ::003::
Continuing to look for relief from the vibrations, especially in the 4000 to 4800 rpm range I went to my dealer yesterday. We set the throttle screws to the 3/4 CCW out from stop position and reset the CO values to +6. This was based on my reading of what Jaxon and Blue Eyes did way back when before their bikes were more heavily modded. I assumed that Blue Eyes must be at sea level more or less and Jaxon too. Colorado values for CO didn't seem to apply here. My bike is stock.
The tech said that at delivery, the throttle screws were 1/2 CCW out from stop and the CO values set at 0. He on his own earlier had set them to 1 1/2 CCW out from stop. The CO values for each cylinder were set at zero. That setting didn't resolve the vibrations in either of the rev ranges mentioned above.
The tech said that in hot ocean coast climates like this one it is difficult to get the motors to run properly. That is why he had set the screws out to 1 1/2 CCW turns. He said that on the motorcycles and ATVs they often have to open the throttle position screws much more than this and up the CO values to 10 or 15 or more to get them to run properly. Since the concensus of this Board seemed to be favourable around 3/4 and + 6 I opted for that.
Our discussion was that the rumbling and vibration areas I have may be related to a LEAN fuel mixture. So we opted to try initially the 3/4 CCW out and CO values of +6. I rode 220 km today and bike responds much better. Hasn't done that much for the vibration patches, especially in the 4000 to 4800 rpm range which is highway cruising range. Maybe a 10% improvement in the vibrations.
Question is.........does it make sense to try wider open throttle screw settings? In particular, moving beyond the 1 1/2 CCW turns out from stop by adding another l/2 CCW turn out for a total of 2 turns out which the tech was suggesting? Any considered suggestions about the CO values? Leave them at +6?
All thoughtful advice much appreciated from those who have done this modification and who may be in similar operating environments. ::003::