mylovelyhorse
Registered user
So I've done a couple of hundred miles on my 1999 R1150GS since finishing replacing the gearbox with one from a 2004 R850C. The gearbox seems good. Gear change is easy, although slightly notchy (but then it is a <3.5k box). The bike is very vibey, however, and the choke still doesn't make any noticeable difference.
Riding into London the past two days has shown that the gearbox's achilles heel is 6th gear. Sitting at 80 or 90 gives way too high revs for comfort - IIRC 80 is 5,100 & 90 is 5,600 rpm. Given it's vibey anyway at the moment, those two values are really too high. Mind you, I can live with it
I shall have to address the vibration though. It isn't at loosen-fillings values but it's much worse than before. I'm kind of assuming that I've cocked up balancing the two throttle bodies and that's the source. Certainly that is where I shall start. I did put the balancer on it the other day and got some curious results. At low revs, the left cylinder gives a reading of (IIRC) 0.4 & the right of 0.2.
Slowly opening the throttle sees the right clinder show a smooth progression in value (not increasing much). The left cylinder, however, reduces in value for a while and then climbs up to equal the right. I thought this might mean there was an air leak but have been unable to find one. I suppose it could actually mean an exhaust leak, but the bike's no louder than it was (although there are more pops and bangs than I recall). I'm hoping this is the reason because I don't want to have to go back to the clutch and see if that's out of balance...
The bike feels lumpy at low revs, particularly when traffic trickling. I know it's a GS so it's bound to be a bit like that but it isn't as smooth as it should be. Easy to stall, too.
I wonder if I made a mistake installing the choke cable? The slack is as described in the book (Haynes and Clymer) but no matter how much I alter the slack value, on a warm or cold bike the tick over doesn't budge. Odd. Could be the wrong cable, I guess, although as I don't have the bag now, I don't know how I could prove that. Maybe it has a part number printed on it.
Any thoughts?
Riding into London the past two days has shown that the gearbox's achilles heel is 6th gear. Sitting at 80 or 90 gives way too high revs for comfort - IIRC 80 is 5,100 & 90 is 5,600 rpm. Given it's vibey anyway at the moment, those two values are really too high. Mind you, I can live with it
I shall have to address the vibration though. It isn't at loosen-fillings values but it's much worse than before. I'm kind of assuming that I've cocked up balancing the two throttle bodies and that's the source. Certainly that is where I shall start. I did put the balancer on it the other day and got some curious results. At low revs, the left cylinder gives a reading of (IIRC) 0.4 & the right of 0.2.
Slowly opening the throttle sees the right clinder show a smooth progression in value (not increasing much). The left cylinder, however, reduces in value for a while and then climbs up to equal the right. I thought this might mean there was an air leak but have been unable to find one. I suppose it could actually mean an exhaust leak, but the bike's no louder than it was (although there are more pops and bangs than I recall). I'm hoping this is the reason because I don't want to have to go back to the clutch and see if that's out of balance...
The bike feels lumpy at low revs, particularly when traffic trickling. I know it's a GS so it's bound to be a bit like that but it isn't as smooth as it should be. Easy to stall, too.
I wonder if I made a mistake installing the choke cable? The slack is as described in the book (Haynes and Clymer) but no matter how much I alter the slack value, on a warm or cold bike the tick over doesn't budge. Odd. Could be the wrong cable, I guess, although as I don't have the bag now, I don't know how I could prove that. Maybe it has a part number printed on it.
Any thoughts?
