Grand Prix 125
Join Date: Sep 2012
Location: Albany, Western Australia
I have problem with mine as well. I have put new vacum tubes on with no joins cut to the same lenght each side. I replaced them after my issues started.
My bike idles fine and runs great under power and also above 3000rpm. The problem is with the throttle just open. Just above idle between 2000rpm and 3000rpm. It will stutter and miss to the point of stalling. It is worse going down hill when you are just holding the throttle open to hold speed.
I have had it plugged into tuneecu and cant find any faults or anything out of the ordinary. I have reloaded the map with no change. I believe it is running rich but i cant now for sure.
To try and make it rideable i have reconected the O2 sensers and loaded a modified map. It is better but still has the same issue just not as bad.
I want to work out the problem and get it back running properly with the O2 SENSERS.
Yes it is a mind scrambler. Only happens with the throttle just on (say 5%). It is like it floods. If you hold the throttle steady, it will decelerate to a point where it fires up again. It is very annoying. Unfortunately we don't have a competent dealership for hundreds of miles due to the ever increasing closures.
Die hard LT owner - you have to be with all the issues mine has had. :-)