Newly, rebuilt motor, brand new 34mm Mikuni on an 850 mkIII.
Bike ran great when carb was first put on but rich. Was going to take the bike on the final engine break in ride and the symptoms I am about to decribe started.
Bike starts to give up or bog down when higher revs happen, just before a shift from 1st to second, second to third. Almost like the carb gets too much fuel and bogs down, revs get choppy and when the throttle is backed off bike runs ok at low revs. Idle on first start up is good and bike runs well and starts well. I don't use the choke either. Bike feels like it stutters and kind of lurches a bit and sounds bad. Revs lower slightly and it will smooth out until you give it more throttle to upshift, sysmptoms start again.
I pulled the plugs and they were very black and sooty. Smaller jet was suggested so I put one in to lean things out and symptoms are still there.
New plugs and a smaller air jet was put in yesterday to see if that works. 35 in there now and a 40 was removed. I also retimed the motor and symptoms are still present.
Help! I want to do the final break in ride and get on with things like riding.
Bike ran great when carb was first put on but rich. Was going to take the bike on the final engine break in ride and the symptoms I am about to decribe started.
Bike starts to give up or bog down when higher revs happen, just before a shift from 1st to second, second to third. Almost like the carb gets too much fuel and bogs down, revs get choppy and when the throttle is backed off bike runs ok at low revs. Idle on first start up is good and bike runs well and starts well. I don't use the choke either. Bike feels like it stutters and kind of lurches a bit and sounds bad. Revs lower slightly and it will smooth out until you give it more throttle to upshift, sysmptoms start again.
I pulled the plugs and they were very black and sooty. Smaller jet was suggested so I put one in to lean things out and symptoms are still there.
New plugs and a smaller air jet was put in yesterday to see if that works. 35 in there now and a 40 was removed. I also retimed the motor and symptoms are still present.
Help! I want to do the final break in ride and get on with things like riding.